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.   a solid
B.   an element
C.   matter
D.   a compound
Question #2
Which of the following types of bonds can be dissociated by water?
A.   hydrogen bonds
B.   ionic bonds
C.   nonpolar covalent bonds
D.   polar covalent bonds
Question #3
What does a buffer do?
A.   It maintains the amount of acid in a solution
B.   It maintains the amount of base in a solution.
C.   It keeps the pH of a solution from changing very much.
D.   It prevents the pH of a solution from changing at all.
Question #4
Which are the outermost electrons of an atom?
A.   Electric electrons
B.   Valence electrons
C.   Covalent electrons
D.   Ionic electrons
Question #5
_________ are substances composed of two or more different atoms bonded together. chemically.
A.   Compounds
B.   Elements
C.   Isotopes
D.   Ions
Question #6
As the concentration of hydrogen ions increases, the pH goes:
A.   down and the solution becomes more acidic
B.   up and the solution becomes more basic
C.   down and the solution becomes more basic
D.   up and the solution becomes more acidic
Question #7
Anything that occupies space and has mass is called:
A.   a solid
B.   matter
C.   an element
D.   a compound
Question #8
In most atoms the number of protons and electrons is
A.   the same.
B.   different, with the number of protons being greater.
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, 12, 4, 1
B.   2, 8, 12, 1
C.   2, 4, 4, 8 ,1
D.   2, 8, 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.   non-polar covalent bond
B.   polar covalent bond
C.   hydrogen bond
D.   ionic bond

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