Chapter 2 Practice Test

The three particles that make up atoms are

• protons, neutrons, and isotopes
• neutrons, isotopes, and electrons
• positives, negatives, and electrons
• protons, neutrons, and electrons

If an atom contains 3 protons, 4 neutrons, and 3 electrons, its mass number would be

• 3
• 4
• 7
• 11

Isotopes are atoms of the same element with the same number of protons and

• a different number of electrons
• a different number of molecules
• a different number of neutrons
• the same number of neutrons

Which of the following terms describes a substance formed by the combination of two or more elements in definite proportions?

• compound
• isotope
• nucleus
• enzyme

What type of electron is available to form bonds?

• valence
• nucleus
• ionic
• covalent

The most abundant compound in most living things is

• carbon dioxide
• water
• sodium chloride
• sugar

In a water molecule, shared electrons spend more time around the oxygen atom than the hydrogen atoms. As a result, the oxygen atom is

• slightly negative
• very negative
• slightly positive
• very positive

When salt is dissolved in water, water is the

• reactant
• solution
• solute
• solvent

If the pH of stomach acid and of oven cleaner were measured,

• both would be below 7
• both would be above 7
• the pH of stomach acid would be above 7, but the pH of oven cleaner would be below 7
• the pH stomach acid would be below 7, but the pH of oven cleaner would be above 7

Amino acid is to protein as

• fat is to lipid
• DNA is to RNA
• sugar is to fat
• simple sugar to starch