Bio 2010 - Microbiology » Fall 2021 » Chapter 2 Quiz

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Question #1
Which are the outermost electrons of an atom?
A.   Ionic electrons
B.   Covalent electrons
C.   Electric electrons
D.   Valence electrons
Question #2
A pure substance that is composed of a unique atomic arrangement is called an:
A.   matter
B.   a compound
C.   an element
D.   a solid
Question #3
What does a buffer do?
A.   It maintains the amount of base in a solution.
B.   It keeps the pH of a solution from changing very much.
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.   ionic bonds
B.   hydrogen bonds
C.   polar covalent 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.   down and the solution becomes more acidic
C.   up and the solution becomes more basic
D.   up and the solution becomes more acidic
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, 8, 12, 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.   ionic bond
B.   hydrogen bond
C.   polar covalent bond
D.   non-polar covalent bond
Question #8
In most atoms the number of protons and electrons is
A.   the same.
B.   variable, depending upon the atomic mass of the element.
C.   different, with the number of protons being greater.
D.   different, with the number of electrons being greater.
Question #9
_________ are substances composed of two or more different atoms bonded together. chemically.
A.   Compounds
B.   Isotopes
C.   Elements
D.   Ions
Question #10
Anything that occupies space and has mass is called:
A.   an element
B.   matter
C.   a compound
D.   a solid

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