1. Chemical vs. Physical Changes Pretest

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Question 1 of 5

1. Question

What type of change is it when salt dissolves into water?

Reversible physical change
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Irreversible physical change
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Reversible chemical change
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Irreversible chemical change
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Question 2 of 5

2. Question

Select ALL of the following that are physical changes. (4 choices)

Burning
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Freezing
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Melting
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Condensation
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Evaporation/Boiling
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Question 3 of 5

3. Question

Which investigation would provide evidence of a physical change?

Burning firewood to keep warm. When the fire burns the wood a new substance is formed.
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Boiling an egg. When the egg is boiled in hot water a new substance is formed.
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Cutting a piece of paper. When the paper is cut, the size of the paper changes, but the substance remains the same.
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Mixing ingredients together to make a cake. When the ingredients are mixed together and put in the oven, a new substance is formed.
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Question 4 of 5

4. Question

Which investigation would provide evidence of a chemical change?

Spray perfume into the air, and when the air and perfume mix, observe the change in odor that happens as they mix .
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Put an antacid tablet in water, and when the antacid and water mix, observe the bubbles that form as a new substance is created .
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Heat water in a pan on a stove, and observe the steam that forms as the state of matter of the water changes .
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Blow air through a wand filled with soap solution, and observe the bubbles that form as the air becomes trapped
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Question 5 of 5

5. Question

A student is investigating chemical changes by using different materials.

Which investigation would provide evidence of a chemical change and why?

Melting a solid with fire would provide evidence of a chemical change because the solid would change shape .
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Cutting cardboard into many smaller pieces would provide evidence of a chemical change because the pieces cannot be put back together .
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Placing a solid into hot water and stirring while the solid dissolves would provide evidence of a chemical change because the dissolved material is lost .
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Combining two liquids that give off heat and gas would provide evidence of a chemical change because the particles react to make a new material with different properties .
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1. Chemical vs. Physical Changes Pretest

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