Bio 2010 - Microbiology » Summer 2021 » Chapter 2 Quiz

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Question #1
A pure substance that is composed of a unique atomic arrangement is called an:
A.   a solid
B.   a compound
C.   matter
D.   an element
Question #2
Which of the following types of bonds can be dissociated by water?
A.   ionic bonds
B.   nonpolar covalent bonds
C.   polar covalent bonds
D.   hydrogen bonds
Question #3
What does a buffer do?
A.   It maintains the amount of acid in a solution
B.   It maintains the amount of base in a solution.
C.   It keeps the pH of a solution from changing very much.
D.   It prevents the pH of a solution from changing at all.
Question #4
Which are the outermost electrons of an atom?
A.   Ionic electrons
B.   Valence electrons
C.   Covalent electrons
D.   Electric electrons
Question #5
_________ are substances composed of two or more different atoms bonded together. chemically.
A.   Isotopes
B.   Compounds
C.   Elements
D.   Ions
Question #6
As the concentration of hydrogen ions increases, the pH goes:
A.   up and the solution becomes more acidic
B.   up and the solution becomes more basic
C.   down and the solution becomes more acidic
D.   down and the solution becomes more basic
Question #7
Anything that occupies space and has mass is called:
A.   an element
B.   a compound
C.   a solid
D.   matter
Question #8
In most atoms the number of protons and electrons is
A.   different, with the number of protons being greater.
B.   different, with the number of electrons being greater.
C.   the same.
D.   variable, depending upon the atomic mass of the element.
Question #9
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, 8, 1
B.   2, 8, 12, 1
C.   2, 4, 4, 8 ,1
D.   2, 12, 4, 1
Question #10
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

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