Chapter 6 Test

A compound is held together by

• chemical bonds

• physical bonds

• gravity

• magnetism

Each molecule of hydrochloric acid, HCl, contains one atom of hydrogen and

• one atom of chlorine.

• two atoms of chlorine.

• one atom of oxygen.

• two atoms of oxygen.

In which substance do the molecules have the strongest attractions to one another?

• sugar, a solid

• sulfuric acid, a liquid

• hydrogen, a gas

• water, a liquid

Atoms often join so that each atom will have

• an outermost energy level that is full of electrons

• an even number of electrons.

• an equal number of protons and electrons.

• more electrons than either protons or neutrons.

In a metallic bond, the nucleus of one atom is attracted by a nearby atom’s

• electrons.

• nucleus

• energy structure.

• negative ion

Solid ionic compounds have very high melting points because they

• contain charged ions that are locked tightly together.

• are positively charged

• contain metallic elements.

• are made of elements that are solid at room temperature

The name for the compound with the formula CuBr2

would be written

• copper(II) bromide.

• copper bromine.

• copper(I) bromide

• copper(III) bromide.

Formaldehyde,CH2O, and acetic acid, C2H4O2

have the same empirical formula but different

• molecular formulas.

• kinds of cations

• kinds of atoms.

• kinds of anions.

Polymers are large organic molecules that are made of

• cations

• carbon and oxygen only

• anions

• repeating units.

The forces that hold different atoms or ions together are

• chemical bonds.

• electric currents

• physical bonds.

• nuclear forces.