Chapter 02 Chemistry of Life
Multiple Choice Questions
1. The smallest unit of an element that still retains the chemical and physical properties of that element
is called
A. an
isotope.
B. a
nucleus.
C. an
atom.
D. a molecular
bond.
E. a
neutrino.
2. In an atom, the number of protons always equals the number
A. of
electrons.
B. of
neutrons.
C. of neutron and
protons.
D. of
quarks.
E. of
neutrinos.
3. Examine the section of the periodic table in Figure 2.1. Which element will behave similarly to C?
A. C
a
B. S
C. A
r
D. S
i
E. M
g
4. How many elements occur naturally?
A. 11
2
B. 9
2
C. 6
4
D. 3
2
E. 6
5. The atomic number of an atom is determined by the number of
A. proton
s.
B. neutron
s.
C. electron
s.
D. protons and
neutrons.
E. protons and
electrons.
True / False Questions
6. An element cannot be broken down by chemical means.
True False
Multiple Choice Questions
7. Why is He over Ne in the periodic table? (Refer to Figure 2.1)
A. They both have the same atomic
mass.
B. They both have the same number of electrons in their
outermost orbital.
C. They both have a full outermost
orbital.
D. They both have the same atomic
number.
E. They both have the same number of protons in
their nuclei.
8. Be has an atomic number of 4 and an atomic mass of 9. How many protons does it have?
A. 4
B. 5
C. 9
D. 1
3
9. What is the symbol for sodium?
A. N
a
B. S
C. S
o
D. N
E. D
m
10. An element has its outermost orbital full and contains more than 2 electrons. Which element is this?
A. H
e
B. N
e
C. C
D. N
E. O
11. Isotopes of an element differ due to the number of
A. proton
s.
B. neutron
s.
C. electron
s.
D. both protons and
electrons.
E. neutrino
s.
12. Carbon dating is a common method employed in dating certain kinds of fossils. It is based upon the
radioactive decay of an isotope of carbon (C14). Referring to the atomic number of carbon attained
from :gure 2.1, how many neutrons does C14 have?
A. 2
B. 4
C. 8
D. 1
2
E. 1
4
13. What is iodine 131, used in medicine to produce various images of organs and tissues, called?
A. A
mixture
B. A
tracer
C. An
emulsion
D. A
colloid
E. A
sensor
True / False Questions
14. Radiation can produce both positive and negative effect for humans.
True False
Multiple Choice Questions
15. A combination of two or more atoms of the same type is called
A. an atomic
unit.
B. a
molecule.
C. a
compound.
D. an
isotope.
E. an
ion.
16. Ca3(PO4)2 represents a/an
A. elemen
t.
B. mixtur
e.
C. compoun
d.
D. isotop
e.
E. ato
m.
17. Atoms that share electrons have what type of bonds?
A. covale
nt
B. neutr
al
C. hydroge
n
D. colloid
al
E. ioni
c
18. CaCl2 is a salt that forms as the result of what type of bond?
A. covale
nt
B. hydroge
n
C. pola
r
D. non-
polar
E. ioni
c
True / False Questions
19. Water makes up 60-70% of total body weight.
True False
Multiple Choice Questions
20. Hy
dro
ge
n
bo
nds
A.
B.
C.
D.
E.
21. Th
e
rea
son
wa
ter
is
pol
ar
is
bec
aus
e
A.
B.
C.
D.
E.
22. Wh
ich
of
the
foll
owi
ng
cha
rac
teri
stic
s
of
wa
ter
is
mo
st
res
po
nsi
ble
for
the
sin
kin
g
of
the
Tit
ani
c?
A.
B.
C.
D.
E.
23. On
a
wa
rm
da
y
in
Apr
il,
Tin
a
ju
mp
ed
int
o
the
swi
m
mi
ng
po
ol.
To
her
sur
pri
se
the
wa
ter
wa
s
rea
lly
col
