Property Changes in Chemical Reactions

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What is a physical change?

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A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition. Examples include shredding paper, melting ice, and dissolving sugar in water.

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances. It involves a chemical reaction and includes processes like burning, rusting, and fermentation.

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What does a coefficient represent in a chemical formula?

Back

A coefficient acts as a multiplier in a chemical formula, indicating the number of molecules or moles of a substance involved in a reaction.

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What is the law of conservation of mass?

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The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction. The total mass of reactants equals the total mass of products.

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What are indicators of a chemical change?

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Indicators of a chemical change include color change, temperature change, gas production (bubbles), formation of a precipitate, and changes in odor.

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What happens to the mass of a substance during a physical change?

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The mass of a substance remains the same during a physical change, as no new substances are formed.

Front

What happens to the mass of a substance during a chemical change?

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The mass of a substance remains the same during a chemical change, as per the law of conservation of mass, even though the substances may change.

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Give an example of a physical change.

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An example of a physical change is melting ice into water.

Front

Give an example of a chemical change.

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An example of a chemical change is burning wood in a fireplace.

Front

What is a reactant?

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A reactant is a substance that undergoes a chemical change in a reaction, participating in the formation of products.