Exploring Matter: Changes and Properties

Explain the difference between density and volume.

• Density is the amount of mass per unit volume, while volume is the amount of space an object occupies.

• Density is the amount of space an object occupies, while volume is the amount of mass per unit volume.

• Density and volume are the same physical property.

• Density is a measure of weight, while volume is a measure of height.

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What is the term for a change in which a substance changes its physical appearance but not its chemical identity?

• Chemical change

• Physical change

• Chemical reaction

• Combustion

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

• Melting point

• Boiling point

• Reactivity with oxygen

• Color

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Which of the following is an indicator of a physical change?

• Formation of a gas

• Change in color

• Change in state

• Production of heat

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

• Ice melting

• Water boiling

• Iron rusting

• Sugar dissolving in water

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Which of the following best describes the process of dissolving sugar in water?

• Chemical change

• Physical change

• Chemical property

• Physical property

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How does the density of a substance affect its ability to float in water?

• Substances with higher density than water will float.

• Substances with lower density than water will float.

• Density does not affect floating.

• Only gases can float in water.

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Which of the following is a chemical change?

• Breaking a glass

• Burning wood

• Cutting paper

• Freezing water

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Why is the ability to conduct electricity considered a physical property?

• It involves a change in chemical composition.

• It can be observed without changing the substance.

• It results in a new substance.

• It is a measure of reactivity.

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THINK

A student observes that a piece of metal changes color when exposed to air. What type of change is this, and what does it indicate?

• Physical change; indicates a change in state

• Chemical change; indicates a reaction with oxygen

• Physical change; indicates a change in temperature

• Chemical change; indicates a change in density

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