Chemical Reactions

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 a physical change?

Back

A physical change is a process that alters the form or appearance of a substance but does not change its chemical composition.

Front

Is rusting of iron a chemical change?

Back

Yes, rusting of iron is a chemical change because it forms a new substance, iron oxide.

Front

Is spoiling food a chemical change?

Back

Yes, spoiling food is a chemical change as it involves the breakdown of food substances into new compounds.

Front

What happens during a physical change?

Back

During a physical change, the substance may change its state or appearance, but its chemical identity remains the same.

Front

Is melting ice a physical or chemical change?

Back

Melting ice is a physical change because it changes from solid to liquid without altering its chemical structure.

Front

What is a balanced chemical equation?

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A balanced chemical equation has equal numbers of each type of atom on both sides, representing the conservation of mass.

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What is an example of a physical change?

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An example of a physical change is hammering wood together to build a house.

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What is an example of a chemical change?

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An example of a chemical change is the combustion of gasoline in a car engine.

Front

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.