Ch 2 Test Review: The Chemistry of Life

Substances are changed into different substances when bonds break and form during

• chemical equilibrium

• chemical reactions

• ion formation

• hydrogen bonding

Atoms in molecules share pairs of electrons when they make

• ionic bonds

• covalent bonds

• hydrogen bonds

• polymers

Which of the following is formed when an atom gains or loses electrons?

• element

• ion

• compound

• molecule

Both animal fats and plant oils are made up of glycerol and 

• phospholipids

• fatty acids

• polar molecules

• saturated fats

The smallest basic unit of matter is the 

• molecule

• atom

• compound

• cell

What gives water many properties that are important to living things?

• temperature

• hydrogen bonds

• density

• specific heat

Which of the following solutions has the highest H+ ion concentration?

• a solution with a pH of 1

• a solution with a pH of 4

• a solution with a pH of 7

• a solution with a pH of 10

The activation energy needed for a chemical reaction is decreased by a 

• catalyst

• reactant

• product

• substrate

The four main types of carbon-based molecules in organisms are carbohydrates, lipids, nucleic acids, and 

• starches

• fatty acids

• monosaccharides

• proteins

Electrons orbit the nucleus of an atom that is composed of these two other particles:

• Protons

• Neutrons

• Positrons

• Photons