Chemical Reactions

Front

What is a chemical reaction?

Back

A process where substances (reactants) undergo a transformation to form new substances (products).

Front

What is an endothermic reaction?

Back

A reaction that absorbs heat from its surroundings, resulting in a temperature drop.

Front

What is an exothermic reaction?

Back

A reaction that releases heat to its surroundings, resulting in a temperature increase.

Front

Do atoms change into different atoms during a chemical reaction?

Back

No, atoms rearrange to form new substances but do not change into different atoms.

Front

What happens to atoms during combustion?

Back

They rearrange to form new substances, such as carbon dioxide and water.

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.

Front

What is an example of a physical change?

Back

Melting ice or boiling water.

Front

What is an example of a chemical change?

Back

Rusting of iron or burning wood.

Front

What is the law of conservation of mass?

Back

In a chemical reaction, mass is neither created nor destroyed; it is conserved.