Bio 2010 - Microbiology » Fall 2021 » Chapter 2 Quiz (2)
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Question #1
Which are the outermost electrons of an atom?
A.
Electric electrons
B.
Covalent electrons
C.
Ionic electrons
D.
Valence electrons
Question #2
A pure substance that is composed of a unique atomic arrangement is called an:
A.
an element
B.
matter
C.
a compound
D.
a solid
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 prevents the pH of a solution from changing at all.
D.
It keeps the pH of a solution from changing very much.
Question #4
Which of the following types of bonds can be dissociated by water?
A.
hydrogen bonds
B.
polar covalent bonds
C.
nonpolar covalent bonds
D.
ionic bonds
Question #5
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 acidic
C.
up and the solution becomes more basic
D.
down 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, 12, 1
C.
2, 8, 8, 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.
polar covalent bond
C.
non-polar covalent bond
D.
hydrogen bond
Question #8
In most atoms the number of protons and electrons is
A.
different, with the number of protons being greater.
B.
different, with the number of electrons being greater.
C.
the same.
D.
variable, depending upon the atomic mass of the element.
Question #9
_________ are substances composed of two or more different atoms bonded together. chemically.
A.
Elements
B.
Compounds
C.
Ions
D.
Isotopes
Question #10
Anything that occupies space and has mass is called:
A.
an element
B.
a solid
C.
a compound
D.
matter
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