Problems pg 95

59. “A mixture is the chemical bonding of
two or more substances in any
proportion.” Is this statement true or
false? Explain.
The statement is false because mixtures
are a physical blend of substances, not a
chemical bonding of substances.
60. Which of the following are the same and
which are different?
a) a substance and a pure substance
b) a heterogeneous mixture and a solution
c) a substance and a mixture
d) a homogeneous mixture and a solution
a) Same
b) Different
c) Different
d) Same
61. Describe how a homogeneous mixture
differs from a heterogeneous mixture
Homogeneous mixtures contain a single phase.
Heterogeneous mixtures can have many phases.
62. Seawater is composed of salt, sand,
and water. Is seawater a heterogeneous
or homogeneous mixture? Explain.
Heterogeneous; composition is not uniform
63. Use iced tea with and without ice
cubes as examples to explain
homogeneous and heterogeneous
mixtures. If you allow all of the ice cubes
to melt, what type of mixture remains?
Ice tea with ice cubes is a heterogeneous
mixture. Ice tea without ice cubes is a
homogeneous mixture. When all ice
cubes melt, the remaining mixture is
homogeneous.
65. State definition of element.
An element is a substance that cannot
be broken down into simpler
substances by physical or chemical
means.
66. Correct the following statements:
a) An element is a combination of two or more
compounds
b) When a small amount of sugar is completely
dissolved in water, a heterogeneous solution
is formed.
a) A compound is combination of two or
more elements
b) When a small amount of sugar is
completely dissolved in water, a
homogeneous solution is formed.
67. Name the elements contained in the
following compounds:
a) Sodium chloride (NaCl)
b) Ammonia (NH4)
c) Ethanol (C2H6O)
d) Bromine (Br2)
a)
b)
c)
d)
Sodium and chloride
Nitrogen and hydrogen
Carbon, hydrogen, and oxygen
Bromine
69. Is it possible to distinguish between an
element and a compound? Explain.
Yes, elements can be distinguished from
compounds. Compounds can be broken
down into their component elements,
whereas elements cannot be broken
down into simpler substances.
70. How are the properties of a compound
related to those of the elements that
comprise it?
The properties of a compound are
unique to that compound and different
from those of its component elements.
71. Which law states that a compound
always contains the same elements in
the same proportion by mass?
The law of definite proportions.
72. a) What is the percent by mass of
carbon in 44 g of carbon dioxide (CO2)?
b) What is the percent mass of oxygen in
44 g of carbon dioxide (CO2)?
a) (12 g/44 g) X 100% = 27%
b) (32 g/44 g) X 100% = 73%
73. Complete the table by classifying the
compounds as 1:1 or 2:2, 1:2 or 2:1, and 1:3
or 3:1.
Compound
Simple Whole-Number
Ratios of Elements
NaCl
1:1
CuO
1:1
H2O
2:1
H2O2
2:2

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