Bio 2010 - Microbiology » Fall 2021 » Chapter 2 Quiz (2)

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

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