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1

The smallest form of a chemical substance that still retains its chemical identity is called a(n) __________.
A)atom
B)electron
C)molecule
D)element
2

Elements required in large amounts to sustain life are known as
A)bulk elements
B)atoms
C)trace elements
D)isotopes
3

True or false. The atomic number for an element is the total number of subatomic particles.
A)True
B)False
4

True or false. The charge of a proton is positive, while the charge of an electron is negative.
A)True
B)False
5

Iron has an atomic number of 26 and an atomic mass of 56. The number of protons is __________.
A)26
B)30
C)56
D)82
6

Isotopes of an element vary in the number of ____________.
A)protons
B)electrons
C)neutrons
D)Isotopes may vary in any of these particles.
7

True or false. The properties of a compound are limited to the individual properties of its constitutive elements.
A)True
B)False
8

If one molecule of glucose (C6H12O6) reacts with six molecules of oxygen (O2) and produces 6 molecules of CO2, how many molecules of water must be produced to balance the equation C6H12O6 + 6 O2 ⇒ 6 CO2 + _____ H2O.
A)6
B)18
C)3
D)12
9

The number of valence shell electrons determines ______________.
A)the atom’s reactive properties
B)the nature of the chemical bonds it forms
C)the column of the periodic table in which it will be located
D)All of these are correct.
10

The first energy shell contains _________.
A)one dumb-bell-shaped orbital
B)one spherical orbital
C)three dumb-bell-shaped orbitals
D)one spherical and three dumb-bell-shaped orbitals
11

What is the total number of electrons that can be held in the second energy shell?
A)32
B)18
C)8
D)2
12

Chemical bonds in which there is a sharing of electrons are called __________ .
A)covalent bonds
B)ionic bonds
C)hydrogen bonds
D)van der Waals attractions
13

Which of these properties of water is important for living organisms?
A)cohesion
B)adhesion
C)solvent
D)All of these are correct.
14

True or false. Solutions that add H+ to a solution are considered acids.
A)True
B)False
15

A solution with a pH of 14 ______________.
A)has a high H+ concentration
B)is neutral
C)has a low H+ concentration
D)is acidic
16

Substances that resist large changes in pH are called ___________.
A)acids
B)buffers
C)bases
D)resistant
17

True or false. A number of temperature-related characteristics of water, such as high heat of vaporization, are important to living organisms.
A)True
B)False
18

The building blocks, or monomers, of the larger carbohydrates such as starch are _______________.
A)oligosaccharides
B)triglycerides
C)amino acids
D)monosaccharides
19

True or false. Two or more monomers are joined into a polymer by hydrolysis.
A)True
B)False
20

Which of these molecules is not a lipid?
A)sterols
B)waxes
C)triglycerides
D)chitin
21

Special proteins responsible for catalyzing reactions in the cell are called ____________.
A)polypeptides
B)kinases
C)enzymes
D)reactants
22

The variable portion of an amino acid is its ___________.
A)amino group
B)R group
C)carboxyl group
D)All of these can be variable.
23

The nucleotide found in RNA but not DNA is ___________.
A)thymine
B)adenine
C)uracil
D)cytosine
24

True or False. DNA is a polymer of amino acids.
A)True
B)False





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