Topic 1.2: The Chemistry of Life

Question 1

The atomic number tells you the

a) number of neutrons in the nucleus
b) number of protons in the atom
c) atomic mass of the atom
d) number of chemical bonds the atom will form
e) all of the above

Answer 1

b) number of protons in the atom

Question 2

Isotopes differ in their

a) number of protons
b) atomic number
c) number of neutrons
d) number of electrons

Answer 2

c) number of neutrons

Question 3

The periodic table provides us with what information?

a) the atomic number, symbol, and mass
b) how many shells an atom has
c) how many electrons are in the outer shell
d) all of the above

Answer 3

d) all of the above

Question 4

An atom that has two electrons in the valence shell, such as magnesium, would most likely

a) share to acquire a completed outer shell
b) lose these two electrons and become a negatively charged ion
c) lose these two electrons and become a positively charged ion
d) bind with carbon by way of hydrogen bonds
e) bind with another magnesium atom to satisfy its energy needs

Answer 4

c) lose these two electrons and become a positively charged ion

Question 5

When an atom gains electrons, it

a) forms a negatively charged ion
b) forms a positively charged ion
c) forms covalent bonds
d) gains atomic mass

Answer 5

a) forms a negatively charged ion

Question 6

An unequal sharing of electrons is a characteristic of a(n)

a) ionic bond
b) polar covalent bond
c) nonpolar covalent bond
d) none of the above

Answer 6

b) polar covalent bond

Question 7

Hydrogen bonds are formed as a result of which of the following?

a) ionic bonds
b) polar covalent bonds
c) nonpolar covalent bonds
d) none of the above

Answer 7

d) none of the above

Question 8

Which of these properties of water can be attributed to hydrogen bonding between water molecules?

a) water stabilizes temperature inside out outside the cell
b) water molecules are cohesive
c) water is a solvent for many molecules
d) ice floats on liquid water
e) all of the above

Answer 8

e) all of the above

Question 9

The fact that water molecules not only cling to themselves, but also the interior surfaces of vessels, can be attributed to the fact that

a) water is cohesive and adhesive
b) water acts as a solvent
c) water has a high head of vaporization
d) all of the above

Answer 9

a) water is cohesive and adhesive