Chemical Reactions

Front

What is a physical change?

Back

A physical change is a change that does not result in the formation of new substances. Examples include freezing, melting, and dissolving.

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new substances. Examples include burning, rusting, and cooking.

Front

What is a molecule?

Back

A molecule is made of two or more atoms bonded together. For example, water (H2O) is a molecule made of two hydrogen atoms and one oxygen atom.

Front

What are the properties of matter?

Back

Properties of matter include characteristics such as mass, volume, density, color, odor, and magnetism.

Front

What happens during a chemical reaction?

Back

During a chemical reaction, reactants are transformed into products, resulting in the formation of new substances.

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; it is conserved.

Front

What is an example of a physical change?

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An example of a physical change is freezing water to make ice.

Front

What is an example of a chemical change?

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An example of a chemical change is the combustion of wood, which produces ash and gases.

Front

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

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A physical change does not create new substances, while a chemical change does.

Front

What is rusting?

Back

Rusting is a chemical change that occurs when iron reacts with oxygen and moisture, forming iron oxide.