Properties and Changes in Matter

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What is a chemical change?

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A process where substances combine or break apart to form new substances, often accompanied by energy changes, color changes, gas production, or precipitate formation.

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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 changes in state (solid, liquid, gas).

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What is a physical property?

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A characteristic of a substance that can be observed or measured without changing the substance's identity, such as color, density, and melting point.

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What is a chemical property?

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A characteristic that describes how a substance interacts with other substances, indicating its potential to undergo a chemical change.

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What are some indicators of a chemical reaction?

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Indicators include color change, gas production, temperature change, and the formation of a precipitate.

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What happens when vinegar and baking soda are mixed?

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They undergo a chemical change, producing carbon dioxide gas.

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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 chemical composition of a substance, while a chemical change results in the formation of new substances.

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Can a substance undergo both physical and chemical changes?

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Yes, a substance can undergo both types of changes; for example, ice melting (physical) and then reacting with another substance (chemical).

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What is an example of a physical property?

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An example of a physical property is the shininess of silver.

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What does it mean if a substance has a high reactivity?

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It means the substance readily undergoes chemical reactions with other substances.