Physical/Chemical Changes & Chemical Reactions Flashcard Review* 2425

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What is a chemical change?

Back

A process where substances combine or break apart to form new substances with different properties.

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What is a physical change?

Back

A change that affects one or more physical properties of a substance without altering its chemical composition.

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Example of a chemical change: Baking cookies.

Back

Baking cookies involves a chemical change as the ingredients undergo a transformation to create a new product.

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Example of a chemical change: Baking soda and vinegar reaction.

Back

This reaction produces carbon dioxide gas, indicating a chemical change.

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Example of a chemical change: Permanently dyeing your hair.

Back

The dye chemically alters the hair structure, resulting in a new color.

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Example of a chemical change: Iron fence rusting.

Back

Rusting is a chemical change where iron reacts with oxygen and moisture to form rust.

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Example of a physical change: Dissolving sugar in water.

Back

The sugar dissolves but retains its chemical identity; it can be recovered by evaporating the water.

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What are indicators of a chemical change?

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

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What is the law of conservation of mass?

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In a chemical reaction, mass is neither created nor destroyed; it remains constant.

Front

What is a reactant?

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A substance that undergoes a chemical change in a reaction.