Review for Unit 1 Multiple Choice Retake

Front

What is the process called when CO₂ (g) dissolves in water to form CO₂ (aq)?

Back

Dissolving

Front

What happens to the temperature of the surroundings during an endothermic reaction?

Back

The temperature of the surroundings will decrease.

Front

What is the name of the process when H₂O (l) turns into H₂O (s)?

Back

Freezing

Front

What is the unit of frequency?

Back

Hz

Front

Which subatomic particles are found in the nucleus of an atom?

Back

Proton and neutron.

Front

Define sublimation.

Back

The process where a solid turns directly into a gas without becoming liquid.

Front

What is an exothermic reaction?

Back

A reaction that releases energy, usually in the form of heat.

Front

What is the difference between an element and a compound?

Back

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

Front

What is the law of conservation of mass?

Back

Mass is neither created nor destroyed in a chemical reaction.

Front

What is the pH scale used for?

Back

To measure the acidity or basicity of a solution.