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PS-3.4 Pure Substances/mixtures
Test Description: Pure substances vs. mixtures (including heterogeneous and homogeneous mixtures)
Instructions: Answer all questions to get your test result.
1) Substances that have unique, identifying properties are called
A
homogeneous mixtures.
B
pure substances.
C
heterogeneous mixtures.
D
mixtures.
2) There are two types of pure substances;
A
elements and mixtures.
B
homogeneous and heterogeneous mixtures.
C
elements and compounds.
D
compounds and mixtures.
3) An element is a pure substance which is composed of only
A
heterogeneous mixtures.
B
one type of atom.
C
homogeneous mixtures.
D
one type of moecule.
4) A compound is a pure substance which is composed of
A
only one type of atom.
B
more than one type of element.
C
two or more component substances which retain their own identifying properties.
D
only one type of element.
5) Compounds can be decomposed into elements only by
A
evaporation.
B
chromatography.
C
filtration.
D
chemical reactions.
6) Compounds have a definite chemical composition identified by
A
a chemical formula.
B
a mole.
C
a physical formula.
D
a baby formula.
7) When matter is composed of two or more component substances which retain their own identifying properties,
A
the matter is classified as a molecular compound.
B
the matter is classified as a compound.
C
the matter is classified as a mixture.
D
the matter is classified as a pure substance.
8) A mixture can be separated
A
by chemical reactions.
B
physically.
C
by oxidation.
D
by corrosion.
9) Heterogeneous mixtures
A
include solutions.
B
have components evenly distributed all the way down to the particles.
C
do not have the components distributed evenly throughout.
D
have components so small that they can not be seen with the naked eye.
10) Homogeneous mixtures have components
A
that are not distributed evenly throughout the mixture.
B
that are always elemental pure substances.
C
evenly distributed all the way down to the particles,whether atoms, molecules, or ions.
D
which are usually large enough to be seen with the naked eye.
*select an answer for all questions
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