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.   a compound
C.   an element
D.   a solid
Question #2
Which of the following types of bonds can be dissociated by water?
A.   polar covalent bonds
B.   nonpolar covalent bonds
C.   hydrogen bonds
D.   ionic bonds
Question #3
What does a buffer do?
A.   It prevents the pH of a solution from changing at all.
B.   It maintains the amount of acid in a solution
C.   It keeps the pH of a solution from changing very much.
D.   It maintains the amount of base in a solution.
Question #4
Which are the outermost electrons of an atom?
A.   Valence electrons
B.   Electric electrons
C.   Covalent electrons
D.   Ionic electrons
Question #5
_________ are substances composed of two or more different atoms bonded together. chemically.
A.   Elements
B.   Isotopes
C.   Compounds
D.   Ions
Question #6
As the concentration of hydrogen ions increases, the pH goes:
A.   up and the solution becomes more basic
B.   down 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.   a compound
B.   matter
C.   an element
D.   a solid
Question #8
In most atoms the number of protons and electrons is
A.   different, with the number of protons being greater.
B.   the same.
C.   different, with the number of electrons being greater.
D.   variable, depending upon the atomic mass of the element.
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, 8, 8, 1
B.   2, 12, 4, 1
C.   2, 4, 4, 8 ,1
D.   2, 8, 12, 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.   hydrogen bond
B.   non-polar covalent bond
C.   polar covalent bond
D.   ionic bond

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