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

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

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