# Chapter 1 HW Solutions

```Chapter 1 HW
Solutions
Ch 1.1 – 1.3
#2
 A) solid
 B) gas
 C) liquid
 D) gas

#4
A) homogeneous mixture
 B) heterogeneous mixture
 C) pure substance
 D) mixture (hetero vs. homo can’t be
determined by visual inspection)

#8
 A)
Be B) Cs C) F
 D) Mn E) As F) Xe G) P
 H) Sc
#10
A) Barium
 B) Californium
 C) Molybdenum
 D) Selenium
 H) Zirconium

E) Thallium
G) Gold
#11
A is a compound – rationale CO2
produced
 B is probably compound because it is
a white solid

Ch1.4 – 1.6

#18a
2

1X10
m  1pm 
9

6.5X10 cm
  65pm
12
 1cm  1X10 m 
or cm  10 m vs pm is 10 m
-2
-12
- 2 - - 12  10 places  move decimal 10 places to right
18b
 1L  1L 
3.35X10 mL 

  .335L
6
 1000mL  1X10 L 
-4
or mL  10 L vs L is 10 m
-3
-6
- 3 - - 6  3 places  move decimal 3 places to right
18 c, d, e
1mmol
C) 2.5  10 mol 
 2.5 mmol
3
110 mol
3
1mm
3
D) 4.23  10 -12 m 3 

.00423mm
(1 10 -3 m) 3
1us
-8
E) 12.5 10 s 
 .125us
-6
110 s
3
18 f, g
1kL
F) 3.5  10 L 
 3.5kL
3
1 10 L
1 10 15 s
1us
9
G) 6.54  10 fs 

 6.54us
6
1fs
1 10 s
3
#20
1000g
A) 2.52X10 kg X
 2.52X10 6 g
1kg
3
1X10 -3 m
1nm
3
B) .0023mm X
X

2.3X10
nm
9
1mm
1X10 m
3
1X10
ms
-4
C) 6.25 X10 s X
 .625ms
1s
#24

Vol = length3;
density = mass/vol
vol  (1.5cm)3  3.375cm3
42.0g
density 
 12g/cm3
3.375cm3
No, ruthenium is more dense than wate r so it will sink
#27

Thickness=volume/area
1g
1cm 3
vol  200mg X
X
 .0104cm 3
1000mg 19.32g
12 2 in 2 2.54 2 cm 2
3
2
area  2.4ftX1ftX
X

2.2X10
cm
1ft 2
in 2
.01035cm 3 1X10  2 m
8
thickness 
X

4.6X10
m
2
2,230cm
1cm
or 46nm thick
CH 1.7 – 1.9
#34
A) 4
 B) 3
 C) ambiguous 5,6, or 7
 D) 6
 E) 6

#36
A) 1.44 X 105
 B) 9.75 X 102
 C) 8.90 X 105
 D) 6.76 X 104
 E) 3.40 X 104
 F) –6.56

#38
A) -2.3 X 103
 B) 8.260 X 107
 C) 3.4 X 104
 D) 7.62 X 105

#41
1000mL
 76mL
1L
or move decimal 3 places
A).076L 
1nm
 50.nm
-9
1 10 m
or move decimal 9 places
B) 5.0  10 -8 m 
-9
1

10
m
C) 6.88  105 ns 
 6.88  10 -4 s
1ns
kg 1000g
1m 3
1dm 3
D) 1.55 3 


 1.55g/L
3
m
1kg (10dm)
1L
#43 a-d
1.609km 1000m
A) 8.60mi 

 1.38 10 4 m
1mi
1km
24hr 60min 60 s
B) 3.00days 


 2.59 105 s
1day
1hr
1 min
\$1.55 1gal 1.057qt \$.410
C)



gal
4qt
1L
L
5.0pm 110-12 m
1ms
-9
D)



5.0

10
m/s
-3
ms
1pm
110 s
#43 e &amp; f
75.00mi 1.609km 1000m 1hr
E)



 33.52m/s
hr
1mi
1km 3600s
3
3
(12in)
(2.54cm)
6
3
F) 55.35ft 3 


1.567

10
cm
1ft 3
1in 3
#45
4qt
1L
A) 31gal 

 1.2 10 2 L
1gal 1.057qt
6mg
1kg
B) 150lb 

 4 10 2 mg
kg 2.205lb
254mi 1.609km 1gal 1.057qt 9.64km
C)




11.2gal
1mi
4qt
1L
1L
50cups 1qt
1L
1000mL
1lb
26ml
D)





1lb
4cups 1.057qt
1L
453.6g
g
Chapter 2 HW
Solutions
2.1 – 2.3

A)
B)
C)
#2
6.500 g compound - .384 g H =
6.116g S
Conservation of Mass
Atoms are not created or destroyed
so if a compound has only H and S
and .384 grams is H the rest must be
sulfur
#4 integer ratio indicates
combining F units that are
indivisible
55.0g F 2.37 gF 1.143


4
23.2g S
1gS
.59
9.8g F .59 gF .59


 1
16.6g S
1gS
.59
68.6g F 3.55 gF 3.55


6
19.3g S
1gS
.59
#5

Evidence that cathode rays were
negatively charged was the electric
and magnetic field deflected the ray
the same way it would a negative
charge and that the negative plate
exposed to the cathode rays acquired
a negative charge.
#11
1 X 10 10 m
1nm
2.4Α.X
X
 .24nm
9
1Α
1 X 10 m
1 X 10 10 m
1pm
2.4Α.X
X
 240pm
12
1Α
1 X 10 m
1m
1A
1Cr atom
7
1.0 cm X
X
X

4.2X10
atoms
10
100 cm 1 X 10 m
2.4A
#14
 A) 32P
has 15 p, 17n, 15 e
 B) 51Cr has 24p, 27n
 C) 60Co has 27 p, 33 n
Ch 2.4 – 2.5
#20
 A) Lithium (metal) B) scandium (metal)
 C) germanium (Metalloid) D) ytterbium
(metal)
 E) manganese (metal) F) gold (metal)
 G) tellurium (metalloid)

#21
A) K, alkali metals (metal)
 B) I, halogens (nonmetal)
 C) Mg, alkaline earth metals (metal)
 D) Ar, noble gases (nonmetal)
 E) S, chalcogens (nonmetals)

#23
An empirical formula shows the
simplest ratio of the different atoms in
a molecule.
 A molecular formula shows the exact
number and kinds of atoms in a
molecule.
 A structural formulas shows how these
atoms are arranged.

#26
A) 4
 B) 6
 C) 9

#28
See board
 A) Draw C2H5Br (1-bromo-ethane)
 B) Draw C2H7N ( dimethylamine)
 C) Draw CH2Cl2 ( dichloromethane)
 D) Draw NH2Cl (chloroamine)

#30
A) SN
 B) C7H15
 C) C3H5O
 D) P2O3
 E) C3H5F4
 F)SiO3

#32
A) Ba2+
 B) La2+ or La3+
 C) Ga3+
 D) S2 E) Br 
#61
Symbol
52Cr3+
130I-
107Ag+
119Sn2+
75As3-
Protons
24
53
47
50
33
Neutron 28
77
60
69
42
Electron 21
54
46
48
36
Net
3+
charge
1-
1+
2+
3-
Chapter 2.6 – 2.7 #38
Molecular (all atoms are nonmetals)
c) SCl2
 Ionic (formed by a cation and an anion,
usually contains a metal cation)—
a) Sc2O3
b) NaI
d) Ca(NO3) 2
e) FeCl3
f) LaP
g) CoCO3
h) (NH4) 2SO4

#39
A) ClO2 D) ClO4
B) ClE) ClO-
C) ClO3-
#42
A) silver sulfide
 B) barium phosphate
 C) magnesium chlorate
 D) strontium sulfite
 E) cobalt (II) bromide (cobaltous
bromide)
 F) tin (II) iodide (stannous iodide)
 G) chromium (III) nitrate (chromic

#42 continued
H) zinc hydrogen phosphate (notice
the lack of roman numerals—it has a
definite charge of +2)
 I) silver perchlorate (notice the lack of
roman numerals—it has a definite
charge of +1)
 J) ammonium dichromate

#44
A) Mg3N2
 B) FeSO3
 C) Cr2(CO3)3
 D) CaH2
 E) Mg(HCO3)2
 F) KClO
 G) Cu(C2H3O2)2

#46
A) HBr
 B) H2SO3
 C) HNO2
 D) carbonic acid
 E) chloric acid
 F) acetic acid

#48
A) dinitrogen monoxide
 B) nitrogen monoxide
 C) nitrogen dioxide
 D) dinitrogen pentoxide
 E) dinitrogen tetroxide

#58









A) alkali metal – K
B) an alkaline earth metal – Ca
C) a noble gas – Ar
D) a halogen – Br
E) a metalliod – Ge
F) a nonmetal in 1A – H
G) a metal that forms a 3+ charge- Al
H) a nonmetal that forms a 2- charge – O
I) a metal that resembles Al - Ga
#62
A) Nickel (II) oxide, 2+
 B) Manganese (IV) oxide, 4+
 C) Chromium (III) oxide, 3+
 D) Molybdenium (VI) oxide, 6+

#63

Fe3S4 could be aq homo mixture
where the Fe2+ and the Fe3+ ions are
portions of the lattice structure
#64
A) IO3 B) IO4 C) IO D) HIO
 E) HIO4 (or H5IO6)

#67
A) potassium nitrate
 B) sodium carbonate
 C) calcium oxide
 D) hydrochloric acid
 E) magnesium sulfate
 F) magnesium hydroxide

```