Arguing About Reversible Changes
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2nd Grade Science › Arguing About Reversible Changes
Make a claim using evidence: which changes can change back, and which cannot change back?
Egg cooking is reversible because it can get cold again. Ice melting is not reversible because water spills. Butter melting is not reversible because it is greasy.
Ice melting and butter melting are reversible because cooling made them hard again. Cooking an egg is not reversible because cooling the cooked egg did not make it raw again. This shows melting can change back, but cooking cannot.
Ice melted in the sun and butter melted on bread. The egg cooked in the pan. Then we put things on a plate to cool.
Ice melting is reversible, butter melting is reversible, and egg cooking is not reversible. These are the answers because my friend said so. I agree with my friend.
Explanation
This question assesses the skill 2-PS1-4: Constructing an argument with evidence that some temperature changes are reversible and some are not. An ARGUMENT has three parts: CLAIM (what you believe—which changes are reversible?), EVIDENCE (observations and test results—what happened when we tried to reverse?), REASONING (why evidence supports claim—this shows it's reversible because...). For reversible changes, evidence shows applying opposite temperature returns material to original state. For not reversible changes, evidence shows even with opposite temperature, material stays changed. The examples are ice melting, butter melting, and egg cooking. REVERSIBLE changes: ice melting and butter melting because water can refreeze and butter can reharden. NOT REVERSIBLE changes: egg cooking because cooling doesn't uncook egg. A complete argument includes claim about each, evidence from observations, and reasoning explaining why. The correct answer is A because it includes all three parts of an argument: CLAIM (states which are reversible and which are not), EVIDENCE (references specific observations from the examples—'cooling made them hard again', 'cooling the cooked egg did not make it raw again'), REASONING (explains why this evidence shows reversibility or not—'this shows melting can change back, but cooking cannot'). The argument uses observations to support the claim. Choice B is incorrect because it provides claim without evidence, using opinion. This error happens when students state opinion without observations and don't connect evidence to claim. To help students construct evidence-based arguments: Teach the three-part structure explicitly using graphic organizer—CLAIM (what I believe), EVIDENCE (what I observed), REASONING (why this supports my claim). Model argument construction: 'I claim ice melting is reversible. My evidence is that when we put the water back in the freezer, it became ice again. This shows it's reversible because we could change it back.' Practice with clear examples first—one reversible, one not reversible—before multiple examples. Sentence frames: 'I claim [change] is [reversible/not reversible] because [evidence]. This shows [reasoning].' Emphasize: Claims need evidence (not 'I think'), evidence must be observations (not opinions), reasoning connects evidence to claim (explains WHY). Use comparison: Show ice melting (observe melting, observe refreezing, conclude reversible) vs egg cooking (observe cooking, try cooling, observe it doesn't uncook, conclude not reversible). Watch for: Students who give claims without evidence, list observations without claims, use 'because I said so' instead of evidence, or don't explain their reasoning. Require all three parts—claim, evidence, reasoning—in every argument.
Sort these changes as can change back or cannot. Use evidence: juice froze, pancake cooked, crayon melted.
Juice freezing is not reversible because it is sticky. Pancake cooking is reversible because it is flat. Crayon melting is not reversible because crayons are colorful.
Juice freezing and crayon melting can change back, but pancake cooking cannot. We warmed the frozen juice and it became liquid again, and we cooled melted crayon and it became hard again. Cooling the cooked pancake did not turn it back into batter, so it cannot change back.
Juice froze in the freezer, pancake cooked on the pan, and crayon melted near a heater. We tried heating and cooling. Those are the steps we did.
All three can change back because we can heat or cool them. Pancakes can become batter again if we mash them. That proves the change is reversible.
Explanation
This question tests skill 2-PS1-4: Constructing an argument with evidence that some temperature changes are reversible and some are not. An ARGUMENT has three parts: CLAIM (what you believe—which changes are reversible?), EVIDENCE (observations and test results—what happened when we tried to reverse?), REASONING (why evidence supports claim—this shows it's reversible because...). For reversible changes, evidence shows applying opposite temperature returns material to original state. For not reversible changes, evidence shows even with opposite temperature, material stays changed. The examples are juice freezing, pancake cooking, and crayon melting. REVERSIBLE changes: juice freezing, crayon melting because evidence—warmed frozen juice became liquid again, cooled melted crayon became hard again. NOT REVERSIBLE changes: pancake cooking because evidence—cooling cooked pancake didn't turn it back into batter. A complete argument includes claim about each, evidence from observations, and reasoning explaining why. The correct answer is A because it includes all three parts of an argument: CLAIM (states which can and cannot change back), EVIDENCE (references specific observations—'warmed the frozen juice and it became liquid again', 'cooled melted crayon and it became hard again', 'Cooling the cooked pancake did not turn it back into batter'), REASONING (explains why this evidence shows reversibility or not—'so it cannot change back'). The argument uses observations to support the claim. Choice D is incorrect because it uses irrelevant characteristics instead of evidence—'sticky', 'flat', 'colorful' have nothing to do with reversibility and shows no experimental observations. This error happens when students make up random reasons instead of using evidence from testing. To help students construct evidence-based arguments: Teach the three-part structure explicitly using graphic organizer—CLAIM (what I believe), EVIDENCE (what I observed), REASONING (why this supports my claim). Model argument construction: 'I claim ice melting is reversible. My evidence is that when we put the water back in the freezer, it became ice again. This shows it's reversible because we could change it back.' Practice with clear examples first—one reversible, one not reversible—before multiple examples. Sentence frames: 'I claim [change] is [reversible/not reversible] because [evidence]. This shows [reasoning].' Emphasize: Claims need evidence (not 'I think'), evidence must be observations (not opinions), reasoning connects evidence to claim (explains WHY). Use comparison: Show ice melting (observe melting, observe refreezing, conclude reversible) vs egg cooking (observe cooking, try cooling, observe it doesn't uncook, conclude not reversible). Watch for: Students who give claims without evidence, list observations without claims, use 'because I said so' instead of evidence, or don't explain their reasoning. Require all three parts—claim, evidence, reasoning—in every argument.
Look at these changes. Use evidence to argue which are reversible: water froze, pancake cooked, wax melted.
Water freezing and wax melting are reversible, but pancake cooking is not. When we warmed the ice, it melted back to water, and when we cooled melted wax, it became solid again. Cooling the cooked pancake did not turn it back into batter, so it cannot change back.
Water froze, pancake cooked, and wax melted. We tried to reverse them by heating or cooling. Some changed and some did not.
Pancake cooking is reversible because it can be cut into pieces. Water freezing is not reversible because ice is different from water. Wax melting is not reversible because wax is used for candles.
All three are reversible because we used temperature. Water can melt, pancakes can cool, and wax can melt. That proves they can all change back.
Explanation
This question tests skill 2-PS1-4: Constructing an argument with evidence that some temperature changes are reversible and some are not. An ARGUMENT has three parts: CLAIM (what you believe—which changes are reversible?), EVIDENCE (observations and test results—what happened when we tried to reverse?), REASONING (why evidence supports claim—this shows it's reversible because...). For reversible changes, evidence shows applying opposite temperature returns material to original state. For not reversible changes, evidence shows even with opposite temperature, material stays changed. The examples are water freezing, pancake cooking, and wax melting. REVERSIBLE changes: water freezing, wax melting because evidence—warmed ice and it melted back to water, cooled melted wax and it became solid again. NOT REVERSIBLE changes: pancake cooking because evidence—cooling cooked pancake didn't turn it back into batter. A complete argument includes claim about each, evidence from observations, and reasoning explaining why. The correct answer is A because it includes all three parts of an argument: CLAIM (states which are reversible and which are not), EVIDENCE (references specific observations—'warmed the ice, it melted back to water', 'cooled melted wax, it became solid again', 'Cooling the cooked pancake did not turn it back into batter'), REASONING (explains why this evidence shows reversibility or not—'so it cannot change back'). The argument uses observations to support the claim. Choice D is incorrect because it makes wrong claims with faulty reasoning—says all are reversible just because temperature was used, ignoring that cooling pancakes doesn't turn them back to batter. This error happens when students assume all temperature changes work the same without considering the actual evidence. To help students construct evidence-based arguments: Teach the three-part structure explicitly using graphic organizer—CLAIM (what I believe), EVIDENCE (what I observed), REASONING (why this supports my claim). Model argument construction: 'I claim ice melting is reversible. My evidence is that when we put the water back in the freezer, it became ice again. This shows it's reversible because we could change it back.' Practice with clear examples first—one reversible, one not reversible—before multiple examples. Sentence frames: 'I claim [change] is [reversible/not reversible] because [evidence]. This shows [reasoning].' Emphasize: Claims need evidence (not 'I think'), evidence must be observations (not opinions), reasoning connects evidence to claim (explains WHY). Use comparison: Show ice melting (observe melting, observe refreezing, conclude reversible) vs egg cooking (observe cooking, try cooling, observe it doesn't uncook, conclude not reversible). Watch for: Students who give claims without evidence, list observations without claims, use 'because I said so' instead of evidence, or don't explain their reasoning. Require all three parts—claim, evidence, reasoning—in every argument.
Do you agree that all heating changes can reverse? Use evidence from: crayon melted, egg cooked, juice froze.
I agree because we can always undo heating with cooling. The crayon got hard again, so the egg will too. Juice freezing also shows all changes can reverse.
I disagree. Crayon melting is reversible because cooling made it hard again, and juice freezing is reversible because warming made it liquid again. Egg cooking is not reversible because cooling the cooked egg did not make it raw again, so not all heating changes reverse.
I disagree because eggs are gross. Crayons are fun, so they can change back. Juice is my favorite drink, so it can change back too.
The crayon melted, the egg cooked, and the juice froze. We used a heater, a pan, and a freezer. Those are the tools we used.
Explanation
This question tests skill 2-PS1-4: Constructing an argument with evidence that some temperature changes are reversible and some are not. An ARGUMENT has three parts: CLAIM (what you believe—which changes are reversible?), EVIDENCE (observations and test results—what happened when we tried to reverse?), REASONING (why evidence supports claim—this shows it's reversible because...). For reversible changes, evidence shows applying opposite temperature returns material to original state. For not reversible changes, evidence shows even with opposite temperature, material stays changed. The examples are crayon melting, egg cooking, and juice freezing. REVERSIBLE changes: crayon melting, juice freezing because evidence—cooling made crayon hard again, warming made frozen juice liquid again. NOT REVERSIBLE changes: egg cooking because evidence—cooling cooked egg didn't make it raw again. A complete argument includes claim about each, evidence from observations, and reasoning explaining why. The correct answer is A because it includes all three parts of an argument: CLAIM (disagrees that all heating changes can reverse), EVIDENCE (references specific observations—'cooling made it hard again', 'warming made it liquid again', 'cooling the cooked egg did not make it raw again'), REASONING (explains why this evidence shows not all changes reverse—'so not all heating changes reverse'). The argument uses observations to support the claim. Choice D is incorrect because it uses personal preferences instead of evidence—'eggs are gross', 'crayons are fun', 'juice is my favorite' are opinions, not experimental observations. This error happens when students use feelings instead of data to support claims. To help students construct evidence-based arguments: Teach the three-part structure explicitly using graphic organizer—CLAIM (what I believe), EVIDENCE (what I observed), REASONING (why this supports my claim). Model argument construction: 'I claim ice melting is reversible. My evidence is that when we put the water back in the freezer, it became ice again. This shows it's reversible because we could change it back.' Practice with clear examples first—one reversible, one not reversible—before multiple examples. Sentence frames: 'I claim [change] is [reversible/not reversible] because [evidence]. This shows [reasoning].' Emphasize: Claims need evidence (not 'I think'), evidence must be observations (not opinions), reasoning connects evidence to claim (explains WHY). Use comparison: Show ice melting (observe melting, observe refreezing, conclude reversible) vs egg cooking (observe cooking, try cooling, observe it doesn't uncook, conclude not reversible). Watch for: Students who give claims without evidence, list observations without claims, use 'because I said so' instead of evidence, or don't explain their reasoning. Require all three parts—claim, evidence, reasoning—in every argument.
Look at these changes. Use evidence to argue which can be reversed by heating or cooling.
Wax melted when we heated it. Bread turned brown in the toaster. After that, we put them on the counter.
Wax melting is reversible because when we cooled the melted wax, it became solid wax again. Bread toasting is not reversible because cooling the toast did not make it soft bread again. This shows some changes can change back and some cannot.
Bread toasting is reversible because toast is crunchy. Wax melting is not reversible because wax is used for candles. So bread can change back but wax cannot.
Wax melting and bread toasting are both reversible because they both use heat. If you cool them, they will both return to the way they were. Heat changes can always be undone.
Explanation
This question assesses the skill 2-PS1-4: Constructing an argument with evidence that some temperature changes are reversible and some are not. An ARGUMENT has three parts: CLAIM (what you believe—which changes are reversible?), EVIDENCE (observations and test results—what happened when we tried to reverse?), REASONING (why evidence supports claim—this shows it's reversible because...). For reversible changes, evidence shows applying opposite temperature returns material to original state. For not reversible changes, evidence shows even with opposite temperature, material stays changed. The examples are wax melting and bread toasting. REVERSIBLE changes: wax melting because wax can reharden. NOT REVERSIBLE changes: bread toasting because cooling doesn't unbrown bread. A complete argument includes claim about each, evidence from observations, and reasoning explaining why. The correct answer is A because it includes all three parts of an argument: CLAIM (states which are reversible and which are not), EVIDENCE (references specific observations from the examples—'it became solid wax again', 'cooling the toast did not make it soft bread again'), REASONING (explains why this evidence shows reversibility or not—'this shows some changes can change back and some cannot'). The argument uses observations to support the claim. Choice B is incorrect because it makes a wrong claim that both are reversible with inaccurate reasoning. This error happens when students get the reversibility wrong and don't connect evidence to claim. To help students construct evidence-based arguments: Teach the three-part structure explicitly using graphic organizer—CLAIM (what I believe), EVIDENCE (what I observed), REASONING (why this supports my claim). Model argument construction: 'I claim ice melting is reversible. My evidence is that when we put the water back in the freezer, it became ice again. This shows it's reversible because we could change it back.' Practice with clear examples first—one reversible, one not reversible—before multiple examples. Sentence frames: 'I claim [change] is [reversible/not reversible] because [evidence]. This shows [reasoning].' Emphasize: Claims need evidence (not 'I think'), evidence must be observations (not opinions), reasoning connects evidence to claim (explains WHY). Use comparison: Show ice melting (observe melting, observe refreezing, conclude reversible) vs egg cooking (observe cooking, try cooling, observe it doesn't uncook, conclude not reversible). Watch for: Students who give claims without evidence, list observations without claims, use 'because I said so' instead of evidence, or don't explain their reasoning. Require all three parts—claim, evidence, reasoning—in every argument.
Are both changes reversible? Use evidence to explain which can change back and why.
Toasting bread is reversible because bread is food. Freezing water is not reversible because ice is too cold. That is my opinion.
Both changes are reversible because they both use heat. Water can freeze, and toast can cool down, so both can change back. Cooling always fixes changes.
We put water in the freezer and it became ice. We toasted bread and it turned brown. Then we cooled both of them.
Freezing water is reversible because when we warmed the ice, it melted back to water. Toasting bread is not reversible because cooling the toast did not turn it back into soft bread. This shows some changes can change back and some cannot.
Explanation
This question assesses the skill 2-PS1-4: Constructing an argument with evidence that some temperature changes are reversible and some are not. An ARGUMENT has three parts: CLAIM (what you believe—which changes are reversible?), EVIDENCE (observations and test results—what happened when we tried to reverse?), REASONING (why evidence supports claim—this shows it's reversible because...). For reversible changes, evidence shows applying opposite temperature returns material to original state. For not reversible changes, evidence shows even with opposite temperature, material stays changed. The examples are freezing water and toasting bread. REVERSIBLE changes: freezing water because ice can melt back to water. NOT REVERSIBLE changes: toasting bread because cooling doesn't unbrown toast. A complete argument includes claim about each, evidence from observations, and reasoning explaining why. The correct answer is B because it includes all three parts of an argument: CLAIM (states which are reversible and which are not), EVIDENCE (references specific observations from the examples—'it melted back to water', 'cooling the toast did not turn it back'), REASONING (explains why this evidence shows reversibility or not—'this shows some changes can change back and some cannot'). The argument uses observations to support the claim. Choice A is incorrect because it makes a wrong claim that both are reversible with inaccurate reasoning. This error happens when students get the reversibility wrong and don't connect evidence to claim. To help students construct evidence-based arguments: Teach the three-part structure explicitly using graphic organizer—CLAIM (what I believe), EVIDENCE (what I observed), REASONING (why this supports my claim). Model argument construction: 'I claim ice melting is reversible. My evidence is that when we put the water back in the freezer, it became ice again. This shows it's reversible because we could change it back.' Practice with clear examples first—one reversible, one not reversible—before multiple examples. Sentence frames: 'I claim [change] is [reversible/not reversible] because [evidence]. This shows [reasoning].' Emphasize: Claims need evidence (not 'I think'), evidence must be observations (not opinions), reasoning connects evidence to claim (explains WHY). Use comparison: Show ice melting (observe melting, observe refreezing, conclude reversible) vs egg cooking (observe cooking, try cooling, observe it doesn't uncook, conclude not reversible). Watch for: Students who give claims without evidence, list observations without claims, use 'because I said so' instead of evidence, or don't explain their reasoning. Require all three parts—claim, evidence, reasoning—in every argument.
Four materials were heated. Use evidence to argue which changes can be reversed by cooling.
Ice, chocolate, and wax are reversible, and egg is not. I claim this because ice is cold and eggs are breakfast foods. That shows which ones can change back.
Ice melted to water, chocolate melted, egg cooked, and wax melted. When we cooled them, some got hard. That happened after we did the test.
Ice and chocolate melted, egg cooked, and wax melted. We cooled them after heating. Ice, chocolate, and wax became solid again, but the cooked egg stayed cooked, so only those three can change back.
All four changes can be reversed by cooling. We can cool anything and it will go back. Eggs will become runny again if they get cold enough.
Explanation
This question tests skill 2-PS1-4: Constructing an argument with evidence that some temperature changes are reversible and some are not. An ARGUMENT has three parts: CLAIM (what you believe—which changes are reversible?), EVIDENCE (observations and test results—what happened when we tried to reverse?), REASONING (why evidence supports claim—this shows it's reversible because...). For reversible changes, evidence shows applying opposite temperature returns material to original state. For not reversible changes, evidence shows even with opposite temperature, material stays changed. The examples are ice melting, chocolate melting, egg cooking, and wax melting. REVERSIBLE changes: ice melting, chocolate melting, wax melting because evidence—cooling made them solid again. NOT REVERSIBLE changes: egg cooking because evidence—cooked egg stayed cooked when cooled. A complete argument includes claim about each, evidence from observations, and reasoning explaining why. The correct answer is A because it includes all three parts of an argument: CLAIM (states which can change back), EVIDENCE (references specific observations—'We cooled them after heating. Ice, chocolate, and wax became solid again, but the cooked egg stayed cooked'), REASONING (explains why this evidence shows reversibility—'so only those three can change back'). The argument uses observations to support the claim. Choice C is incorrect because it makes claims without proper evidence—uses irrelevant reasons like 'ice is cold and eggs are breakfast foods' instead of observations from the experiment. This error happens when students state opinions or unrelated facts instead of using experimental evidence. To help students construct evidence-based arguments: Teach the three-part structure explicitly using graphic organizer—CLAIM (what I believe), EVIDENCE (what I observed), REASONING (why this supports my claim). Model argument construction: 'I claim ice melting is reversible. My evidence is that when we put the water back in the freezer, it became ice again. This shows it's reversible because we could change it back.' Practice with clear examples first—one reversible, one not reversible—before multiple examples. Sentence frames: 'I claim [change] is [reversible/not reversible] because [evidence]. This shows [reasoning].' Emphasize: Claims need evidence (not 'I think'), evidence must be observations (not opinions), reasoning connects evidence to claim (explains WHY). Use comparison: Show ice melting (observe melting, observe refreezing, conclude reversible) vs egg cooking (observe cooking, try cooling, observe it doesn't uncook, conclude not reversible). Watch for: Students who give claims without evidence, list observations without claims, use 'because I said so' instead of evidence, or don't explain their reasoning. Require all three parts—claim, evidence, reasoning—in every argument.
Make a claim using evidence: which changes can change back, and which cannot change back?
Ice melting is reversible, butter melting is reversible, and egg cooking is not reversible. These are the answers because my friend said so. I agree with my friend.
Egg cooking is reversible because it can get cold again. Ice melting is not reversible because water spills. Butter melting is not reversible because it is greasy.
Ice melted in the sun and butter melted on bread. The egg cooked in the pan. Then we put things on a plate to cool.
Ice melting and butter melting are reversible because cooling made them hard again. Cooking an egg is not reversible because cooling the cooked egg did not make it raw again. This shows melting can change back, but cooking cannot.
Explanation
This question assesses the skill 2-PS1-4: Constructing an argument with evidence that some temperature changes are reversible and some are not. An ARGUMENT has three parts: CLAIM (what you believe—which changes are reversible?), EVIDENCE (observations and test results—what happened when we tried to reverse?), REASONING (why evidence supports claim—this shows it's reversible because...). For reversible changes, evidence shows applying opposite temperature returns material to original state. For not reversible changes, evidence shows even with opposite temperature, material stays changed. The examples are ice melting, butter melting, and egg cooking. REVERSIBLE changes: ice melting and butter melting because water can refreeze and butter can reharden. NOT REVERSIBLE changes: egg cooking because cooling doesn't uncook egg. A complete argument includes claim about each, evidence from observations, and reasoning explaining why. The correct answer is A because it includes all three parts of an argument: CLAIM (states which are reversible and which are not), EVIDENCE (references specific observations from the examples—'cooling made them hard again', 'cooling the cooked egg did not make it raw again'), REASONING (explains why this evidence shows reversibility or not—'this shows melting can change back, but cooking cannot'). The argument uses observations to support the claim. Choice B is incorrect because it provides claim without evidence, using opinion. This error happens when students state opinion without observations and don't connect evidence to claim. To help students construct evidence-based arguments: Teach the three-part structure explicitly using graphic organizer—CLAIM (what I believe), EVIDENCE (what I observed), REASONING (why this supports my claim). Model argument construction: 'I claim ice melting is reversible. My evidence is that when we put the water back in the freezer, it became ice again. This shows it's reversible because we could change it back.' Practice with clear examples first—one reversible, one not reversible—before multiple examples. Sentence frames: 'I claim [change] is [reversible/not reversible] because [evidence]. This shows [reasoning].' Emphasize: Claims need evidence (not 'I think'), evidence must be observations (not opinions), reasoning connects evidence to claim (explains WHY). Use comparison: Show ice melting (observe melting, observe refreezing, conclude reversible) vs egg cooking (observe cooking, try cooling, observe it doesn't uncook, conclude not reversible). Watch for: Students who give claims without evidence, list observations without claims, use 'because I said so' instead of evidence, or don't explain their reasoning. Require all three parts—claim, evidence, reasoning—in every argument.
Look at these changes. Which are reversible? Use evidence and reasons to explain your claim.
The butter was yellow and the toast was brown. Brown means it is not reversible. Yellow means it is reversible.
Butter melted on warm bread, and when we cooled it, it became solid again. Bread toasted and turned brown, and cooling did not make it bread again. So butter melting is reversible, but toasting bread is not, because only butter changed back when cooled.
Butter is reversible and toast is not reversible. I claim this because my teacher said so, not because of the test.
Both are reversible because both changes happened with heat. If we cool the toast, it will un-toast. The butter will also get hard.
Explanation
The skill is 2-PS1-4: Constructing an argument with evidence that some temperature changes are reversible and some are not. An argument has three parts: claim (what you believe—which changes are reversible?), evidence (observations and test results—what happened when we tried to reverse?), and reasoning (why evidence supports claim—this shows it's reversible because...). For reversible changes, evidence shows applying opposite temperature returns material to original state; for not reversible changes, evidence shows even with opposite temperature, material stays changed. The examples are butter melting and bread toasting; reversible change: butter melting because cooling solidifies it again; not reversible change: toasting bread because cooling doesn't un-toast it; a complete argument includes claim about each, evidence from observations, and reasoning explaining why. The correct answer is A because it includes all three parts of an argument: claim (states which are reversible and which are not), evidence (references specific observations from the examples—'it became solid again', 'cooling did not make it bread again'), reasoning (explains why this evidence shows reversibility or not—'so butter melting is reversible, but toasting bread is not, because only butter changed back when cooled'); the argument uses observations to support the claim. Distractor choice C is incorrect because it has a claim without evidence, relying on authority instead of observations; this error happens when students use opinion not evidence or don't address all examples. To help students construct evidence-based arguments: Teach the three-part structure explicitly using graphic organizer—claim (what I believe), evidence (what I observed), reasoning (why this supports my claim); model argument construction like 'I claim butter melting is reversible; my evidence is that when we cooled it, it became solid again; this shows it's reversible because we could change it back'; practice with clear examples first—one reversible, one not—before multiple examples, using sentence frames like 'I claim [change] is [reversible/not reversible] because [evidence]; this shows [reasoning]'; emphasize claims need evidence (not 'I think'), evidence must be observations (not opinions), reasoning connects evidence to claim (explains why); watch for students who use 'because teacher said' instead of evidence or give partial arguments, and require all three parts in every argument.
Use evidence to argue which changes can be reversed by cooling and which cannot be reversed.
Ice, chocolate, and wax are reversible because when we cooled them, they became hard again. The cooked egg is not reversible because cooling did not make it raw again. This shows some heating changes can change back, but cooking makes something new.
Ice turned into water. Chocolate melted into a gooey puddle. Egg cooked in a pan. Wax melted into liquid. We tried cooling all of them.
Ice is reversible, chocolate is reversible, wax is reversible, and egg is not. That is my answer because I said so.
All four changes are reversible because cooling fixes heating. If you cool the egg long enough, it will uncook. The evidence is that cooling makes things cold.
Explanation
The skill is 2-PS1-4: Constructing an argument with evidence that some temperature changes are reversible and some are not. An argument has three parts: claim (what you believe—which changes are reversible?), evidence (observations and test results—what happened when we tried to reverse?), and reasoning (why evidence supports claim—this shows it's reversible because...). For reversible changes, evidence shows applying opposite temperature returns material to original state; for not reversible changes, evidence shows even with opposite temperature, material stays changed. The examples are ice melting, chocolate melting, egg cooking, and wax melting; reversible changes: ice melting, chocolate melting, wax melting because cooling makes them solid again; not reversible change: egg cooking because cooling doesn't make it raw; a complete argument includes claim about each, evidence from observations, and reasoning explaining why. The correct answer is B because it includes all three parts of an argument: claim (states which are reversible and which are not), evidence (references specific observations from the examples—'when we cooled them, they became hard again', 'cooling did not make it raw again'), reasoning (explains why this evidence shows reversibility or not—'this shows some heating changes can change back, but cooking makes something new'); the argument uses observations to support the claim. Distractor choice A is incorrect because it lists observations without a claim or reasoning; this error happens when students describe what happened without claiming which are reversible or don't connect evidence to claim. To help students construct evidence-based arguments: Teach the three-part structure explicitly using graphic organizer—claim (what I believe), evidence (what I observed), reasoning (why this supports my claim); model argument construction like 'I claim wax melting is reversible; my evidence is that when we cooled it, it became solid again; this shows it's reversible because we could change it back'; practice with clear examples first—one reversible, one not—before multiple examples, using sentence frames like 'I claim [change] is [reversible/not reversible] because [evidence]; this shows [reasoning]'; emphasize claims need evidence (not 'I think'), evidence must be observations (not opinions), reasoning connects evidence to claim (explains why); watch for students who list observations without claims or don't explain their reasoning, and require all three parts in every argument.