Chemical Reactions

Front

What is a catalyst?

Back

A catalyst is a substance that speeds up a chemical reaction without being consumed in the process.

Front

What are some signs that a chemical reaction has occurred?

Back

Signs of a chemical reaction include color change, odor change, and change in properties.

Front

What is an example of a chemical change?

Back

Examples of chemical changes include burning wood, rusting of a car, and cooking food.

Front

Who studies chemical reactions to create new materials?

Back

A materials scientist studies chemical reactions to form new materials.

Front

What is a molecule?

Back

A molecule is made of two or more atoms bonded together.

Front

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

Back

A physical change alters the form of a substance but not its chemical composition, while a chemical change results in the formation of new substances.

Front

What is the law of conservation of mass?

Back

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction.

Front

What is an example of a physical change?

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Examples of physical changes include melting ice, boiling water, and dissolving sugar in water.

Front

What role do reactants play in a chemical reaction?

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Reactants are the starting substances that undergo a chemical change to form products.

Front

What are products in a chemical reaction?

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