Chemical Reactions of Matter

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What is a chemical reaction?

Back

A process where substances (reactants) undergo a transformation to form new substances (products) with different properties.

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What is a chemical change?

Back

A change that results in the formation of new chemical substances, characterized by changes in properties and composition.

Front

What is a physical change?

Back

A change that affects one or more physical properties of a substance but does not alter its chemical composition.

Front

What are reactants in a chemical equation?

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The starting substances that undergo a chemical change in a reaction.

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What are products in a chemical equation?

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The new substances formed as a result of a chemical reaction.

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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 is conserved.

Front

What is an example of a chemical reaction?

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Burning wood, where wood reacts with oxygen to produce ash, smoke, and gases.

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What is an example of a physical change?

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Melting ice, where ice changes from solid to liquid but remains water.

Front

How many atoms of hydrogen are in one molecule of water (H₂O)?

Back

2 hydrogen atoms.

Front

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

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