Chemistry of Life 2018

The space surrounding the nucleus of an atom contains

• protons.
• electrons.
• neutrons.
• ions.

Which of the following makes up a molecule of water?

• one atom of hydrogen and one atom of oxygen
• one atom of sodium and one atom of chlorine
• one atom of hydrogen and two atoms of oxygen
• two atoms of hydrogen and one atom of oxygen

What type of electron is available to form bonds?

• valence
• nucleus
• ionic
• covalent

What type of ion forms when an atom loses electrons?

• neutral
• positive
• negative
• possibly positive or negative

The most abundant compound in most living things is

• carbon dioxide.
• water.
• sodium chloride.
• sugar.

When salt is dissolved in water, water is the

• reactant.
• solution.
• solute.
• solvent.

A monosaccharide is a

• carbohydrate.
• lipid.
• nucleic acid.
• protein.

When hydrogen and oxygen combine to form water, water would be

• a product.
• a reactant.
• both a product and a reactant.
• neither a product nor a reactant.

If a reaction in one direction releases energy, the reaction in the opposite direction

• also releases energy.
• absorbs energy.
• destroys energy.
• cannot occur.

Enzymes affect the reactions in living cells by changing the

• products of the reaction.
• speed of the reaction.
• temperature of the reaction.
• pH of the reaction.