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.   matter
B.   an element
C.   a compound
D.   a solid
Question #2
Which of the following types of bonds can be dissociated by water?
A.   nonpolar covalent bonds
B.   ionic bonds
C.   polar covalent bonds
D.   hydrogen bonds
Question #3
What does a buffer do?
A.   It maintains the amount of base in a solution.
B.   It prevents the pH of a solution from changing at all.
C.   It maintains the amount of acid in a solution
D.   It keeps the pH of a solution from changing very much.
Question #4
Which are the outermost electrons of an atom?
A.   Ionic electrons
B.   Covalent electrons
C.   Valence 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.   down and the solution becomes more basic
B.   up and the solution becomes more basic
C.   down and the solution becomes more acidic
D.   up and the solution becomes more acidic
Question #7
Anything that occupies space and has mass is called:
A.   matter
B.   a compound
C.   a solid
D.   an element
Question #8
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 #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, 12, 4, 1
B.   2, 8, 12, 1
C.   2, 8, 8, 1
D.   2, 4, 4, 8 ,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.   ionic bond
B.   non-polar covalent bond
C.   hydrogen bond
D.   polar covalent bond

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