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 basic
B.   up and the solution becomes more basic
C.   up and the solution becomes more acidic
D.   down and the solution becomes more acidic
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, 8, 8, 1
C.   2, 4, 4, 8 ,1
D.   2, 12, 4, 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.   ionic bond
B.   non-polar covalent bond
C.   hydrogen bond
D.   polar covalent bond
Question #4
In most atoms the number of protons and electrons is
A.   different, with the number of electrons being greater.
B.   variable, depending upon the atomic mass of the element.
C.   the same.
D.   different, with the number of protons being greater.
Question #5
_________ are substances composed of two or more different atoms bonded together. chemically.
A.   Ions
B.   Elements
C.   Compounds
D.   Isotopes
Question #6
Which of the following types of bonds can be dissociated by water?
A.   ionic bonds
B.   polar covalent bonds
C.   hydrogen bonds
D.   nonpolar covalent bonds
Question #7
Anything that occupies space and has mass is called:
A.   an element
B.   a solid
C.   matter
D.   a compound
Question #8
A pure substance that is composed of a unique atomic arrangement is called an:
A.   matter
B.   a compound
C.   a solid
D.   an element
Question #9
What does a buffer do?
A.   It maintains the amount of acid in a solution
B.   It keeps the pH of a solution from changing very much.
C.   It maintains the amount of base in a solution.
D.   It prevents the pH of a solution from changing at all.
Question #10
Which are the outermost electrons of an atom?
A.   Ionic electrons
B.   Valence electrons
C.   Electric electrons
D.   Covalent electrons

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