Chapter 2 Test

An element is a pure substance that cannot be broken down into other substances by physical or chemical means.

• True

• False

An covalent bond is formed when two atoms share electrons.

• True

• False

Which one is a formula for a chemical compound?

• H

• H20

• J

• O

The total number of atoms in a molecule of sucrose, C12H22O11, is ____.

• 12

• 22

• 11

• 45

A substrate binds to an enzyme’s active site.

• True

• False

Which of the atoms pictured in Figure 6-1 is most likely to form an ion?

• one with one electron on the outer most energy level

• one with two in the outer most energy level

• they are the same

As the H+ concentration of a solution in water increases, the OH– concentration decreases.

• True

• False

Which is the negatively charged particle located outside the nucleus of an atom?

• neutron

• proton

• silicone

• electron

In a molecule of water, the electrons are more strongly attracted to the hydrogen nuclei than to the oxygen nucleus. Therefore electrons spend more time near the hydrogen nuclei and there is an unequal sharing of electrons.

• True

• False

Which particle in the nucleus of an atom has a neutral charge?

• Silicone

• Proton

• Neutron

• Electron