Solutions to Chem 100 Work Group Set 4 Questions
1.
Classify each of the following as primarily a physical or chemical change.
a) rusting of a nail
chemical, a new substance is formed
b) creating a painting with watercolors
physical, no new substance is formed
c) dissolving oxygen gas in water physical, no new substance is formed
2.
Classify each of the following as a homogeneous or heterogeneous mixture.
a) sheet of plastic
homogeneous, uniform composition throughout
b) very fine playground sand
heterogeneous, more than one phase is present
c) tapioca pudding heterogeneous, more than one phase is present
3.
Classify each of the following as a metal, a nonmetal, a compound, a homogeneous
mixture or a heterogeneous mixture.
a) hydrogen peroxide
compound, two elements present in a definite composition
b) leather
heterogeneous mixture, more than one phase is present
c) vinegar
homogeneous mixture, uniform composition throughout
4.
Provide the element name or symbol, as appropriate, for each of the following.
a)
b)
c)
d)
5.
Ba barium
Mn manganese
arsenic
As
strontium Sr
Provide the name or formula, as appropriate, for each of the following.
a)
b)
c)
d)
silver carbonate Ag2CO3
Co(OH)2 cobalt(II) hydroxide
CaSO3
calcium sulfite
potassium permanganate KMnO4
Solutions to CHEM 100 Test Questions
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