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Biology 2015

Sylvia S. Mader, Michael Windelspecht

Chapter 2

Basic Chemistry

Educators

MC
+ 6 more educators

Problem 1

Bryan L.
Numerade Educator

Problem 2

Isotopes differ in their
a. number of protons.
b. atomic number.
c. number of neutrons.
d. number of electrons

Bryan L.
Numerade Educator

Problem 3

Bryan L.
Numerade Educator

Problem 4

Bryan L.
Numerade Educator

Problem 5

Bryan L.
Numerade Educator

Problem 6

When an atom gains electrons, it
a. forms a negatively charged ion.
b. forms a positively charged ion.
c. forms covalent bonds.
d. forms ionic bonds.
e. gains atomic mass

Bryan L.
Numerade Educator

Problem 7

An unequal sharing of electrons is a characteristic of a/an
a. ionic bond.
b. polar covalent bond.
c. nonpolar covalent bond.
d. All of these are correct

MB
Maryam B.
Numerade Educator

Problem 8

Hydrogen bonds are formed as a result of which of the following?
a. ionic bonds
b. nonpolar covalent bonds
c. polar covalent bonds
d. None of these are correct

Bryan L.
Numerade Educator

Problem 9

Which of these properties of water can be attributed to hydrogen bonding between water molecules?
a. Water stabilizes temperature inside and 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 are correct.

Bryan L.
Numerade Educator

Problem 10

match the statements with a property of water in the key.
KEY:
a. Water flows because it is cohesive.
b. Water holds its heat.
c. Water has neutral pH.
d. Water has a high heat of vaporization.

Sweating helps cool us off.

Bryan L.
Numerade Educator

Problem 11

Match the statements with a property of water in the key.
KEY:
a. Water flows because it is cohesive.
b. Water holds its heat.
c. Water has neutral pH.
d. Water has a high heat of vaporization.

Our blood is composed mostly of water and cells

Bryan L.
Numerade Educator

Problem 12

Match the statements with a property of water in the key.
KEY:
a. Water flows because it is cohesive.
b. Water holds its heat.
c. Water has neutral pH.
d. Water has a high heat of vaporization.

Our blood is just about pH 7.

Bryan L.
Numerade Educator

Problem 13

Match the statements with a property of water in the key.
KEY:
a. Water flows because it is cohesive.
b. Water holds its heat.
c. Water has neutral pH.
d. Water has a high heat of vaporization.

We usually maintain a normal body temperature.

Bryan L.
Numerade Educator

Problem 14

$H_{2} CO_{3} / NaHCO_{3}$ is a buffer system in the body. What effect the addition of an acid have on the ph of a solution that is buffered?

a. The pH will rise.
b. The pH will lower.
c. The pH will not change.
d. All of these are correct.

Bryan L.
Numerade Educator

Problem 15

Which of these best describes the changes that occur when a solution goes from pH 5 to pH 7?

a. The solution is now 100 times more acidic.
b. The solution is now 100 times more basic.
c. The hydrogen ion concentration decreases by only a factor of 20, as the solution goes from basic to acidic.
d. The hydrogen ion concentration changes by only a factor of 20, as the solution goes from acidic to basic.

Bryan L.
Numerade Educator