/hao, S’c,L
?•I, ?012
Chemistry 115 FSG Worksheet 2(Chapter 2)
1. Bromine exists naturally as a mixture of bromine7in1 hromine81 isotopes. An atom of
hromine49 contains
3 protons, 44 neutrons. 35 electrons
‘4 protons arid 6 clcctrons only
“‘7
44 protons, 44 electrons, and 35 neutrons
c)
35 protons, 79 neutrons, and 35 electrons
d)
79 protons. 79 electrons, and 35 neutrons
e)
2. Which of the following statements are Irue of uranium—238?
I. Its chemical properties will he exactly like those of uranium-235,—
II. Its mass will be slightly different from that olan atom of uranium
235.
Ill It ill contain a dilfercnt numhcr of protons th in an atom of uranium—
“—
K’
.,
“235.
IV. It s more plentiful in nature than uranium-235.
Ill, IV
a)
b)
1,1!. III
1,11, IV
d)
II. III, IV
e) all of these
3. ‘F The number of neutrons in an atom is the same for all neutral atoms of that element.
F
ta)
‘Th
C)
d)
e)
j
[‘he number of electrons in an
has
20 protons.
22 protons,
20 protons,
22 protons,
20 protons,
20
20
22
18
20
neutrons,
neutrons,
neutrons,
neutrons,
neutrons,
and
and
and
and
and
atom
is the same [‘or all neutral atoms of that element.
I 8 electrons
20 electrons
18 electrons
18 electrons
22 electrons
6. Which 01’ the followini. statements is (are) true?
a)
and ,F have the same number of neutrons.
I
it
/ -‘
cach other hccausc thur mass numbers arc the same
has the same number ot’electrons as
A and B
A and C
and
c)
d)
‘
N
1
ire
/
isotpot
7. All of the following are true except:
Ions are formed by adding electrons to a neutral atom.
a)
Ions are formed by changing the numb
4T
1’roinatoms nucleus.
‘‘c’
Ions are formed by removing electrons from a neutral atom.
An ion has a positive or negative charge.
d)
e)
Metals tend to form positive ions.
/hao, Nept, 24,2012
8. Which of the following are incorrectly paired?
Copper. Cu h) Carbon. C c) Cobalt. Co
a)
d) Calcium, Ca
e) (?esirn. Ce
—
9. Which of the following are incorrectly paired?
Sr. alkaline earth metal
a)
b)
[‘a, transition metal
c
F’. halogen
As, halogen
d
V. transition metal
C)
10. All of the lollowing are characteristics of metals except:
a)
good conductors of heat
h)
malleable
ductile
c)
d)
often lustrous
tend to’aiQ electrons in chemical reactions
Ic
11. All of’ the fllowing are characteristics of nonmetals except:
a)
poor conductors of electricity
h)
often bond to each other by ftrming covalent bonds
tend to form negative i in chemical reactions with metals
4 d) appear in the upperjft:hwd corner of the periodic table
do not have a shiny (lustrous) appearance
e)
12. Complete the lolloxving table. (Show your work)
Number
(1)
(2)
‘1/
./
ii
52
‘TT
(4)
1n
54
‘‘—
30
2
c
=
..
c2
r
r
# iVeutrons # Electrons Net (‘harge
°
P
6
h
(3)
ii
# Protons
—
(i
I ç_<’
.
Zhao, S’ept, 24,2012
13. Write the symbol for each of the following elements.
a)
b)
c)
d)
e)
silver
calcium
iodine
copper
phosphorus
-T
-
-
14. Name the following compottpds.
4
(
2
A1
3
)
S0
Nal-1
AgCI
L...
3
0
2
N
•., :..
:‘.:
0
2
Hg
0
2
Cu
H13r
NO
4
NH
3
CC’
4
4
CaSO
2
Sn1
[IgO
CuO
4
FeSO
—-
-4-,
A
-
.--.
-
--,— -.
2__
‘
I,
H
‘,-.--
I
({1
C& Y
15. Write the formula for the following compounds/ions:
sodium sulfate
iron(III) oxide
dichlorine heptoxide
cobalt(II) chloride
aluminum hydroxide
nitric acid
phosphoric acid
phosphorus trichioride
magnesium
copper (II) bromide
nitrate ion
ammonium ion
sulfite ion
dichromate ion
phosphate ion
chlorate ion
cyanide ion
sulfuric acid
phosphoric acid
hydrochloric acid
acetic acid
sulfurous acid
nitrous acid
chloric acid
16. Magnesium has three naturally occurring isotopes. magnesium-24 (atomic mass23.98504;
1
abunda
9
9%
nce=’7
),
8 magnesium-25 (atomic mass=24.98584; abundance=lO.OO%) and
magnesium-24?(atomic mass=25.98259). Calculate the average atomic weight of magnesium.
/c
7
/
—
L
)1fj)
A.ry
4
I’
i I
N
r\
-.
.
)
/..,
3
______________________
.E.
Zhao, Sept, 24,2012
Hi-4
17. Ilow many atoms (total’) are the in one formuldit of 4
(P0
3
Ca
?
2
)
18. How many oxygen atoms are there in one formula unit of 4
(P0
3
Ca
?
2
)
)
19. Which metals fo?m cations with varying positive charges?
(yansataon metals b) Group 1 metals c) Group 2 metals d) Group 3 metals e) metalloids
I
20. A species with 12 protons and 10 electrons is
21. Which of the following pairs can be used to iiiistrate thelaw of multiple proportions?
SO and SO
2
d)
b)
CO and CaCO
3
c) 1420 and 0
C
2
H
1
2
1
S0 and H
2
H
4
S e)
2
KCI and KC1O
2
22. Give some examples of intensive and extensive properties.
1A
4
CI
(=4
fla.(=,
+
*
pI
L
(=(=LAC
4