Chemical Reactions Unit Test Review

Front

What is mucus?

Back

Mucus is a slippery secretion produced by, and covering, mucous membranes. It serves as an output in biological processes.

Front

What three elements do lipids, carbohydrates, and proteins have in common?

Back

C, H, O (Carbon, Hydrogen, and Oxygen) are the three elements common to lipids, carbohydrates, and proteins.

Front

What must happen during every chemical reaction?

Back

New molecules are formed and there is always a change in energy.

Front

How many different elements and total atoms are in a water molecule (H2O)?

Back

Water molecules consist of 2 different elements (Hydrogen and Oxygen) and 3 total atoms.

Front

What do living things obtain from eating food?

Back

Living things get matter and energy from eating food.

Front

Define a chemical reaction.

Back

A chemical reaction is a process that leads to the transformation of one set of chemical substances to another.

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 are reactants in a chemical reaction?

Back

Reactants are the starting materials in a chemical reaction that undergo change.

Front

What are products in a chemical reaction?

Back

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

Front

What is an exothermic reaction?

Back

An exothermic reaction is a chemical reaction that releases energy, usually in the form of heat.