Changes Caused by Heating and Cooling
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2nd Grade Science › Changes Caused by Heating and Cooling
Will says some changes caused by heating cannot be reversed. Angelo says some changes can be reversed.
Their father takes a popsicle out of the freezer and sets it on the counter. The popsicle begins to melt. He gets a call and puts it back into the freezer.
Using this example who is correct, Will or Angelo, and why?
Will; He is correct because this is a change that cannot be reversed. Once the popsicle has started to melt, there is no changing that.
Angelo; He is correct because this is a change that can be reversed. If the popsicle were melting and put back into the freezer, it would refreeze and become solid again.
There is not enough information to decide who is correct.
Neither of the boys is correct.
Explanation
In the situation presented, Angelo is correct. The changes to the popsicle can be reversed. Once it has been heated up and starts to melt, there is a change. In this case, their father puts it back into the freezer when he gets the call; this would cause the popsicle to refreeze. In some instances, these changes can not be reversed, but in this example, it is possible.
Which of these photos demonstrates a change from heating or cooling that cannot be reversed?
Explanation
The photo that demonstrates a change that cannot be reversed is the pan of brownies. Writing with markers can be erased and reversed, ice cubes can be heated and cooled multiple times between states, and a puzzle can be taken apart and put back together. Once the ingredients are mixed into a batter and then heated, the brownies cannot be turned into mixture again.
An example of a change caused by heating or cooling that can be reversed would be the melting of a candy bar and then putting it into the refrigerator to reset the chocolate.
True
False
Explanation
The statement above is a true statement and example of how heating and cooling can be reversed. If you melt a candy bar, the chocolate goes from a solid to a liquid. This can be reversed, and the candy bar can be returned to a solid-state by freezing or cooling it. Some changes cannot be reversed, but this example can be reversed.
Which statement is constructed using evidence?
Heating and cooling is a process that can be reversed. I melted a popsicle and then put the popsicle back in the freezer, and it froze into a solid popsicle again. I did this multiple times, and it always worked. This is an argument based on evidence.
Heating and cooling is a process that can be reversed. I ate a popsicle. I did this multiple times. This is an argument based on evidence.
Heating and cooling is a process that can be reversed. I bought popsicles at the grocery store and put them in the freezer. This is an argument based on evidence.
Heating and cooling is a process that can be reversed. I bought popsicles at the grocery store, and they melted in the car. This is an argument based on evidence.
Explanation
The statement that is constructed using evidence includes no personal opinions or statements and has scientific evidence to support the claim. "Heating and cooling is a process that can be reversed. I melted a popsicle and then put the popsicle back in the freezer, and it froze into a solid popsicle again. I did this multiple times, and it always worked. This is an argument based on evidence." This statement shows that the investigation was repeated multiple times, and information was recorded.
I melted a crayon and then put the crayon in the refrigerator, and it did not form back into the crayon shape, just a hard pile of colored wax. I did this multiple times, and it always happened the same way. I think heating can be reversed. This is an argument based on evidence.
True
False
Explanation
This argument is based on evidence. There is no personal opinion or thoughts involved in the statement. The popsicle investigation provides data to make conclusions from, so it is evidence-based and supported.
Which of these photos demonstrates a change from heating or cooling that cannot be reversed?
Explanation
The photo that demonstrates a change that cannot be reversed is the pan of brownies. Writing with markers can be erased and reversed, ice cubes can be heated and cooled multiple times between states, and a puzzle can be taken apart and put back together. Once the ingredients are mixed into a batter and then heated, the brownies cannot be turned into mixture again.
Becky says some changes caused by heating cannot be reversed. Maddy says all changes can be reversed. Their mother cooked hashbrowns for breakfast. Using this example, which sister is correct, Becky or Maddy, and why?
Becky; once the potato has been cooked there is no way to reverse it back into the form it was before
Maddy; the potato can be uncooked and put back into its original form
Neither; neither Becky nor her sister Maddy is correct
There is not enough information to tell who is correct or incorrect
Explanation
Some changes caused by heating or cooling cannot be reversed. This statement is true, so in the cases of Becky and her sister Maddy, Becky is correct. Some changes caused by heating, like cooking a potato, can't be reversed. There is no way to take the potato from cooked and get it back into its raw form.
Will says some changes caused by heating cannot be reversed. Angelo says some changes can be reversed.
Their father takes a popsicle out of the freezer and sets it on the counter. The popsicle begins to melt. He gets a call and puts it back into the freezer.
Using this example who is correct, Will or Angelo, and why?
Will; He is correct because this is a change that cannot be reversed. Once the popsicle has started to melt, there is no changing that.
Angelo; He is correct because this is a change that can be reversed. If the popsicle were melting and put back into the freezer, it would refreeze and become solid again.
There is not enough information to decide who is correct.
Neither of the boys is correct.
Explanation
In the situation presented, Angelo is correct. The changes to the popsicle can be reversed. Once it has been heated up and starts to melt, there is a change. In this case, their father puts it back into the freezer when he gets the call; this would cause the popsicle to refreeze. In some instances, these changes can not be reversed, but in this example, it is possible.
An example of a change caused by heating or cooling that can be reversed would be the melting of a candy bar and then putting it into the refrigerator to reset the chocolate.
True
False
Explanation
The statement above is a true statement and example of how heating and cooling can be reversed. If you melt a candy bar, the chocolate goes from a solid to a liquid. This can be reversed, and the candy bar can be returned to a solid-state by freezing or cooling it. Some changes cannot be reversed, but this example can be reversed.
Which statement is constructed using evidence?
Heating and cooling is a process that can be reversed. I melted a popsicle and then put the popsicle back in the freezer, and it froze into a solid popsicle again. I did this multiple times, and it always worked. This is an argument based on evidence.
Heating and cooling is a process that can be reversed. I ate a popsicle. I did this multiple times. This is an argument based on evidence.
Heating and cooling is a process that can be reversed. I bought popsicles at the grocery store and put them in the freezer. This is an argument based on evidence.
Heating and cooling is a process that can be reversed. I bought popsicles at the grocery store, and they melted in the car. This is an argument based on evidence.
Explanation
The statement that is constructed using evidence includes no personal opinions or statements and has scientific evidence to support the claim. "Heating and cooling is a process that can be reversed. I melted a popsicle and then put the popsicle back in the freezer, and it froze into a solid popsicle again. I did this multiple times, and it always worked. This is an argument based on evidence." This statement shows that the investigation was repeated multiple times, and information was recorded.