Bio 2010 - Microbiology » Fall 2021 » Chapter 2 Quiz

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

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