Bio 2010 - Microbiology » Summer 2022 » Chapter 2 Quiz

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

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