Compare Properties Before and After - 5th Grade Science

Which observation is the best evidence that mixing caused a chemical change?

A new substance forms (new properties appear). Chemical changes create substances with different properties than the originals.
Which property should you record before and after mixing to check for gas production?

Presence of bubbles or fizzing (gas formation). Gas bubbles show new gaseous products formed during reaction.
Identify the evidence of change when two clear liquids are mixed and a solid suddenly appears.

Precipitate formed (evidence of chemical change). Solids forming from liquids indicates new substances were created.
Which property should you record before and after mixing to check for temperature change?

Temperature. Heat changes indicate energy released or absorbed in reactions.
Identify the best evidence of a chemical change: bubbles, dissolving, or cutting paper.

Bubbles. Gas production indicates new substances forming from a reaction.
Identify the best conclusion: After mixing, bubbles form and temperature drops noticeably.

Evidence suggests a chemical change occurred. Bubbles and temperature drop are signs of a chemical reaction.
What observation after mixing is strong evidence of a chemical change: gas bubbles, heavier spoon, or smoother cup?

Gas bubbles. Bubbles show gas formation from chemical reactions between substances.
What observation after mixing is evidence of color change that may indicate a new substance?

A new color appears. Color change often indicates new chemical compounds formed.
What does it mean if a mixture becomes cloudy and a solid settles to the bottom?

A precipitate formed, suggesting a chemical change. Cloudiness and settling indicate insoluble products formed.
What is a chemical change when substances are mixed?

A change that produces one or more new substances. Atoms rearrange to form different compounds with new properties.
What is the definition of a chemical change when materials are mixed?

A change that forms one or more new substances. Atoms rearrange to create different substances with new properties.
Identify the best conclusion: After mixing, the liquid turns cloudy and a solid settles out.

A precipitate formed; evidence suggests a chemical change. Cloudiness and solid formation indicate a precipitation reaction.
What observation is strongest evidence of a chemical change during mixing?

Gas production (bubbling) not caused by stirring. Gas forms from chemical reactions, not just from physical agitation.
Identify the best property to measure to compare before and after mixing: mass, container color, or brand name.

Mass. Mass is conserved in all changes, making it measurable and comparable.
Identify the type of change when salt is mixed into water and the salt is no longer visible.

Physical change (dissolving; no new substance). Salt separates into ions but remains salt; can be recovered by evaporation.
What is the correct term for the substance that does the dissolving in a solution?

Solvent. The substance doing the dissolving, like water dissolving sugar.
What does it mean if the mixture can be separated by evaporation after mixing?

A dissolved solid was present; it is a solution (mixture). Evaporation removes solvent, leaving dissolved substance behind.
Which option best describes dissolving sugar in water: physical change or chemical change?

Physical change. Sugar molecules spread between water molecules without reacting.
What is the correct term for the substance that dissolves in a solution?

Solute. The substance being dissolved, like sugar in water.
What observation after mixing is strong evidence of a chemical change: a solid forms, faster stirring, or smaller pieces?

A solid forms (a precipitate). Precipitates form when dissolved substances react to create insoluble products.
Identify the best test to compare before and after mixing to detect gas production.

Look for bubbles or inflate a balloon over the container. Visual observation or gas collection confirms gas production.
Which property should you record before and after mixing to check for color change?

Color. Visual comparison reveals if new pigments or compounds formed.
Which observation is evidence of a solid forming after mixing two liquids?

A precipitate forms (new solid appears). Precipitates are insoluble products formed in chemical reactions.
Which property is best compared before and after mixing to detect a change: color, name, or age?

Color. Color changes are observable and indicate possible chemical reactions.
What is the definition of a physical change when substances are mixed?

A change in form or properties with no new substance formed. The original substances remain but may look different.
Identify the best conclusion: After mixing, the substances can be separated by filtering.

No new substance is confirmed; it is likely a physical mixture. Separation by filtering shows substances didn't chemically react.
Identify the best test to compare before and after mixing to detect a temperature change.

Measure temperature with a thermometer. Thermometers provide quantitative data on heat changes.
What property change suggests a new gas formed during mixing rather than trapped air escaping?

Bubbling continues after stirring stops. Trapped air escapes quickly; reaction gas continues forming.
What observation after mixing is strong evidence of a chemical change: light produced, clearer label, or louder timer?

Light produced. Light emission indicates energy release from chemical bond changes.
Which conclusion is best if the only change after mixing is that the mixture becomes colder to the touch?

A chemical change may have occurred (temperature changed). Temperature drop shows energy was absorbed in a possible reaction.
Which observation is NOT good evidence of a chemical change: new color, gas bubbles, or smaller pieces after crushing?

Smaller pieces after crushing. Crushing only changes size, not chemical composition of the material.
Which observation is evidence that mixing released or absorbed heat?

Temperature increases or decreases without external heating/cooling. Energy changes without external sources indicate chemical reactions.
Which property should you compare before and after mixing to test if a new gas formed?

Presence of bubbles or gas release. Bubbles show gas molecules forming from the reaction.
What does it mean if the mixture can be separated by filtering after mixing?

A solid is present; it is likely a mixture, not one pure substance. Filtering separates components that didn't chemically combine.
What observation after mixing is evidence of an energy change without heating the container?

The mixture temperature changes. Temperature change without external heat indicates a chemical reaction.
Which option best describes mixing sand and water: homogeneous or heterogeneous mixture?

Heterogeneous mixture. Sand particles remain visible and don't dissolve in water.
What is the correct conclusion if two substances mix and can be separated by filtering?

A mixture formed, not a new substance. Physical separation means no chemical bonds formed between substances.
What is the definition of a physical change when materials are mixed?

A change in form or state with no new substance formed. Matter changes appearance but keeps its chemical identity.
What is a solution after mixing two substances?

A uniform mixture where one substance dissolves in another. The dissolved substance spreads evenly throughout the solvent.
What observation indicates a precipitate formed after mixing two liquids?

A solid appears in the liquid and settles or floats. Precipitates are new solid substances formed from liquid reactions.
Identify the term for a mixture that looks the same throughout after mixing.

Homogeneous mixture (solution). All parts have the same composition and appearance.
Which property is best compared before and after mixing to detect a change: temperature, brand, or price?

Temperature. Temperature changes indicate energy release or absorption during reactions.
What observation after mixing is evidence that light energy was released?

The mixture gives off light. Light emission indicates energy release from a chemical reaction.
What does a temperature decrease during mixing often indicate?

Energy absorption, which can be evidence of a chemical change. Some reactions absorb heat to break and form new bonds.
What does a temperature increase during mixing often indicate?

Energy release, which can be evidence of a chemical change. Chemical reactions often release heat as bonds form.
What is a physical change when substances are mixed?

A change in form or properties with no new substance made. The substance's appearance changes but its chemical identity remains the same.
What is the definition of a chemical change when substances are mixed?

A change that forms one or more new substances. The original substances react to create different substances.
What is a chemical change when two materials are mixed?

A change that forms one or more new substances. Atoms rearrange to create different molecules with new properties.
Identify the correct conclusion: after mixing, the material can be separated with a filter.

A physical mixture formed (no new substance required). Filtration separates components that didn't chemically combine.
Which option is most likely a chemical change: vinegar and baking soda bubbling or salt dissolving?

Vinegar and baking soda bubbling. Acid-base reactions produce carbon dioxide gas, indicating chemical change.
What is the name for a mixture in which one substance dissolves evenly in another?

Solution. A homogeneous mixture where particles are evenly distributed.
Which observation is the best evidence that mixing caused a chemical change?

Formation of a new substance. New substances have different properties than the originals.
Which property change best shows a new substance formed: color change or melting?

Color change. New substances often have different colors than the original materials.
What is the correct conclusion if a mixture is uniform and no new properties appear after mixing?

A physical change (mixing/dissolving) likely occurred. No new properties means substances just mixed without reacting.
What is a physical change when two materials are mixed?

A change in form or appearance without making a new substance. Matter changes shape or state but keeps its chemical identity.
What is the correct conclusion if mixing produces a new odor that was not present before?

Possible chemical change (new substances may have formed). New odors suggest different molecules formed through chemical reaction.
What observation after mixing is strong evidence of a chemical change: new odor, louder sound, or larger container?

New odor. New smells mean new molecules formed with different properties.
Identify the type of change when sand is mixed with water and can settle out over time.

Physical change (mixture; no new substance). Sand doesn't dissolve; particles just spread out and can be filtered.
Which option best describes bubbles forming when vinegar is mixed with baking soda?

Chemical change. Gas production indicates new substances formed through reaction.
What property comparison helps identify change after mixing: before/after color or container shape?

Before/after color. Container shape stays constant; substance properties may change.
Identify the correct conclusion: color changes after mixing and does not fade back when stirred.

Evidence of a chemical change. Permanent color change indicates new chemical compounds formed.
What property change after mixing most strongly suggests a solid formed from liquids?

A precipitate forms (new solid appears). Solid particles forming from mixed liquids shows a chemical reaction.
What is the difference between dissolving and melting?

Dissolving mixes into a solution; melting changes solid to liquid. Dissolving requires a solvent; melting only needs heat.
Which observation after mixing supports a physical change: new odor, new solid, fizzing, or no new substance?

No new substance. Physical changes don't create new materials with different properties.
Which separation method shows a solid is dissolved in water: filtration or evaporation?

Evaporation. Dissolved solids remain after water evaporates; undissolved solids filter out.
Which option describes a mixture, not a new substance: sand and iron filings or rust?

Sand and iron filings. Components retain their original properties and can be separated.
Identify the correct conclusion: iron filings and sand are mixed and can be separated with a magnet.

A physical mixture formed. Magnetic separation works because materials retained original properties.
Which option best describes dissolving sugar in water: physical change or chemical change?

Physical change. Sugar molecules disperse but remain chemically unchanged.
Which conclusion is best if the mixture can be separated by filtering and both materials look unchanged?

It is a physical change (a mixture, not a new substance). Separation by physical means shows no chemical bonds were formed.
Which property should you compare before and after mixing to test for an energy change?

Temperature. Heat absorbed or released indicates chemical energy changes.
Which option is the best evidence of a chemical change: melting, dissolving, bubbling, or cutting?

Bubbling. Gas formation shows new substances created, unlike physical processes.
Which option is evidence of a physical change: dissolving sugar or forming a solid precipitate?

Dissolving sugar. Sugar molecules spread between water molecules without forming new substances.
What does it mean if two solids are mixed and you can still see both materials?

A mixture formed; no new substance is evident. Visible separation means no chemical bonds formed between materials.
What observation after mixing is evidence of a smell change that may indicate a new substance?

A new odor appears. Different smell suggests new chemical compounds formed.
What property change after mixing most strongly suggests a gas was produced?

Bubbling or fizzing appears. Gas formation indicates a chemical reaction occurred.
Identify the term for a mixture with visibly different parts after mixing.

Heterogeneous mixture. Different regions have different compositions or appearances.
Identify the evidence of change when vinegar and baking soda are mixed and many bubbles form.

Gas produced (evidence of chemical change). Bubbles show CO₂ gas forms from the acid-base reaction.

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