Bio 2010 - Microbiology » Summer 2021 » Chapter 2 Quiz (B)

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Question #1
As the concentration of hydrogen ions increases, the pH goes:
A.   down and the solution becomes more acidic
B.   up and the solution becomes more acidic
C.   down and the solution becomes more basic
D.   up and the solution becomes more basic
Question #2
On the Periodic table of Elements, potassium’s (K) atomic number is 19. It also is in the first group and has four periods. Which of the following is the correct electron configuration for potassium?
A.   2, 8, 12, 1
B.   2, 12, 4, 1
C.   2, 4, 4, 8 ,1
D.   2, 8, 8, 1
Question #3
A chemical bond formed by the equal sharing of one or more pairs of electrons between outer shells of two atoms is called a(n):
A.   non-polar covalent bond
B.   hydrogen bond
C.   polar covalent bond
D.   ionic bond
Question #4
In most atoms the number of protons and electrons is
A.   variable, depending upon the atomic mass of the element.
B.   the same.
C.   different, with the number of electrons being greater.
D.   different, with the number of protons being greater.
Question #5
_________ are substances composed of two or more different atoms bonded together. chemically.
A.   Isotopes
B.   Ions
C.   Elements
D.   Compounds
Question #6
Which of the following types of bonds can be dissociated by water?
A.   polar covalent bonds
B.   ionic bonds
C.   nonpolar covalent bonds
D.   hydrogen bonds
Question #7
Anything that occupies space and has mass is called:
A.   a compound
B.   an element
C.   matter
D.   a solid
Question #8
A pure substance that is composed of a unique atomic arrangement is called an:
A.   a compound
B.   a solid
C.   an element
D.   matter
Question #9
What does a buffer do?
A.   It prevents the pH of a solution from changing at all.
B.   It keeps the pH of a solution from changing very much.
C.   It maintains the amount of acid in a solution
D.   It maintains the amount of base in a solution.
Question #10
Which are the outermost electrons of an atom?
A.   Ionic electrons
B.   Electric electrons
C.   Valence electrons
D.   Covalent electrons

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