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  • Basic Chemistry

Biology

Sylvia S. Mader, Michael Windelspecht

Chapter 2

Basic Chemistry - all with Video Answers

Educators

+ 6 more educators

Chapter Questions

02:12

Problem 1

Text Unavailable

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 its electrons if the atom is neutral.
e. Both b and d are correct.

Bryan Lynn
Bryan Lynn
Numerade Educator
01:48

Problem 2

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

Bryan Lynn
Bryan Lynn
Numerade Educator
03:35

Problem 3

Text Unavailable

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 these are correct.

Bryan Lynn
Bryan Lynn
Numerade Educator
02:27

Problem 4

Text Unavailable

Which of the subatomic particles contributes almost no weight to an atom?
a. protons in the electron shells
b. electrons in the nucleus
c. neutrons in the nucleus
d. electrons at various energy levels

Bryan Lynn
Bryan Lynn
Numerade Educator
03:05

Problem 5

Text Unavailable

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.

Bryan Lynn
Bryan Lynn
Numerade Educator
01:48

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 Lynn
Bryan Lynn
Numerade Educator
04:15

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 Batool
Numerade Educator
02:08

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 Lynn
Bryan Lynn
Numerade Educator
02:09

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 Lynn
Bryan Lynn
Numerade Educator
01:41

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 Lynn
Bryan Lynn
Numerade Educator
02:05

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 Lynn
Bryan Lynn
Numerade Educator
01:27

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 Lynn
Bryan Lynn
Numerade Educator
01:34

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 Lynn
Bryan Lynn
Numerade Educator
02:10

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 Lynn
Bryan Lynn
Numerade Educator
02:51

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 Lynn
Bryan Lynn
Numerade Educator

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