Chemical and Physical Properties and Changes

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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, or gas production.

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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 or shape.

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What is a chemical property?

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A characteristic of a substance that describes its ability to undergo a specific chemical change, such as reactivity with acids or flammability.

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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 its identity, such as color, density, or boiling point.

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What evidence indicates a chemical change?

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

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What happens to bonds during a chemical change?

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The bonds of the reactants are broken and rearranged to form new products.

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What is reactivity with acid?

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A chemical property that describes how a substance reacts when it comes into contact with an acid, often resulting in a chemical change.

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What is an example of a physical change?

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Melting ice into water is a physical change because it alters the state of the substance without changing its chemical composition.

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What is an example of a chemical change?

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Burning wood is a chemical change because it transforms the wood into ash and gases, creating new substances.

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How can you identify a chemical property?

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A chemical property can be identified by testing the substance's behavior in a chemical reaction, such as its ability to rust or react with other chemicals.