Chemical Changes

Front

What is a chemical change?

Back

A chemical change is a process where substances combine or break apart to form new substances with different properties.

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What is the law of conservation of mass?

Back

The law of conservation of mass states that in a chemical reaction, the total mass of the reactants equals the total mass of the products.

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What are reactants in a chemical equation?

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Reactants are 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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Products are the substances that are formed as a result of a chemical reaction.

Front

Give an example of a chemical change.

Back

An example of a chemical change is a candle burning, where wax (reactant) is transformed into carbon dioxide and water (products).

Front

What happens to the mass of substances during a chemical reaction?

Back

The mass of substances remains the same before and after a chemical reaction, according to the law of conservation of mass.

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What is a chemical equation?

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A chemical equation is a symbolic representation of a chemical reaction, showing the reactants and products.

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What is a word equation?

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A word equation is a way of representing a chemical reaction using the names of the reactants and products.

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Can you reverse a chemical change?

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Most chemical changes are irreversible, meaning you cannot get the original substances back.

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What is an example of a physical change?

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An example of a physical change is melting ice, where the ice changes from solid to liquid but remains water.