Chemistry

Front

What is a chemical reaction?

Back

A process where substances (reactants) are transformed into new substances (products) with different properties.

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What is the law of conservation of mass?

Back

In a chemical reaction, mass is neither created nor destroyed; the total mass of reactants equals the total mass of products.

Front

What is a physical change?

Back

A change that affects one or more physical properties of a substance without altering its chemical composition.

Front

What is a chemical change?

Back

A change that results in the formation of new chemical substances.

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What are reactants?

Back

Substances that undergo a chemical change in a reaction.

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What are products?

Back

Substances that are formed as a result of a chemical reaction.

Front

What is an atom?

Back

The smallest unit of an element that retains the properties of that element.

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What is a molecule?

Back

A group of two or more atoms bonded together.

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What is the difference between an element and a compound?

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An element is a pure substance made of only one type of atom, while a compound is made of two or more different types of atoms chemically bonded together.

Front

What is a mixture?

Back

A combination of two or more substances that are not chemically bonded.