Physical and Chemical Changes Review

What is a chemical change?

• When a substance changes its state from solid to liquid.

• When a substance changes how it looks or feels but remains the same substance.

• When a substance changes into a completely new substance with different properties.

• When a substance changes its temperature.

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Which of the following is NOT an example of a chemical change?

• Burning wood

• Souring milk

• Boiling water

• Exploding firework

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What happens during a chemical change?

• The substance changes its state from solid to liquid.

• The substance changes into a completely new substance with different properties.

• The substance changes its temperature.

• The substance changes how it looks or feels but remains the same substance.

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Which of the following is an example of a chemical change?

• Folding paper

• Melting ice

• Cooking an egg

• Boiling water

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What is the main difference between a physical change and a chemical change?

• Physical change alters the chemical composition, while chemical change does not.

• Physical change creates new substances, while chemical change does not.

• Physical change alters the appearance or state, while chemical change creates new substances.

• Physical change is irreversible, while chemical change is reversible.

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Which of the following is NOT a characteristic of a chemical change?

• Formation of a new substance

• Change in chemical properties

• Change in physical appearance only

• Irreversibility

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What are the five common phase changes of matter?

• Melting, Freezing, Sublimation, Condensation, Evaporation

• Melting, Boiling, Freezing, Condensation, Evaporation

• Melting, Freezing, Boiling, Condensation, Precipitation

• Melting, Freezing, Sublimation, Deposition, Evaporation

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What happens during a chemical change?

• Substances react and form new substances with different properties

• Substances change their shape and size but remain the same

• Substances dissolve in water

• Substances mix but do not react

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What is the process called when a gas turns into a liquid?

• Melting

• Freezing

• Sublimation

• Condensation

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Why is understanding the reactivity of elements crucial in jewelry making?

• It helps jewelers choose metals that are more colorful.

• It helps jewelers choose metals that won’t easily tarnish or corrode.

• It helps jewelers choose metals that are heavier.

• It helps jewelers choose metals that are cheaper.

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