Properties of Matter

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What is a chemical change?

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A process where a substance transforms into a different substance with different properties, often indicated by signs such as gas formation, color change, or temperature change.

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What is a physical change?

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A change that affects one or more physical properties of a substance without altering its chemical composition, such as melting or dissolving.

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What are physical properties?

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Characteristics of a substance that can be observed or measured without changing its identity, such as color, density, and boiling point.

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What are chemical properties?

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Characteristics that describe how a substance interacts with other substances, indicating its potential to undergo chemical changes, such as reactivity with acids.

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What is an example of a sign of a chemical reaction?

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Formation of a gas, such as bubbles when vinegar is mixed with baking soda.

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What happens during digestion?

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Food undergoes a chemical change as it is broken down into simpler substances by enzymes.

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

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A physical change does not alter the substance's chemical identity, while a chemical change results in the formation of new substances.

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What is an example of a physical change?

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Melting ice into water.

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What is an example of a chemical property of water?

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Reacts with pure sodium to produce hydrogen gas.

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What does it mean for a property to be observable?

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It can be detected or measured without changing the substance's identity.