Chapter 1 homework answers (Zumdahl and Zumdahl)
4. a) iii- the mass is exactly 280.0 g
b) iv- dissolved sugar takes up less space
6. a) physical change
b) chemical change
c) physical change
8. 3.2 ml- precision is limited by the first graduated cylinder.
12. distance driven (ex. Miles), car mileage (ex. Miles/gallon), price of gas (ex. $/gallon)
30. (typo…I meant to assign this one instead of #20…give it a try and see how you do)
a) 1
32. e) 2
b) 2
c) 4
f) 3
38. a) 6.32 X 10 25
d) 2
e) infinite
g) 3
h) 4
b) 7.82 X 10 -17
e) 8.1 X 10 -1
f) 1
c)2.02 X 10 -1
d) 2.29 X 10 -27
f) 1130
44. a) 0.01 km2
b) 2.2 ha
50. a) 1.1 hours
b) 9.38 L of gas
c) $31,000 /acre
c
66. 11.7 ml
67. a) both are the same
78 a) mixture
b) Hg (14 g)
c) both are the same (19.3 g)
b) S + Mg  MgS…a compound (pure substance)
80. sublimation is a physical change
82 a) physical change
b) chemical change
84. 0.010 kg of active ingredient
Additional density problem
1) Density of metal slug = 5.6 g/mL
c) physical change
d) benzene (880 g)