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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
heterogeneous mixtures.
C
pure substances.
D
mixtures.
2) There are two types of pure substances;
A
homogeneous and heterogeneous mixtures.
B
compounds and mixtures.
C
elements and mixtures.
D
elements and compounds.
3) An element is a pure substance which is composed of only
A
heterogeneous mixtures.
B
one type of atom.
C
one type of moecule.
D
homogeneous mixtures.
4) A compound is a pure substance which is composed of
A
more than one type of element.
B
only one type of atom.
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
chromatography.
B
filtration.
C
evaporation.
D
chemical reactions.
6) Compounds have a definite chemical composition identified by
A
a physical formula.
B
a chemical formula.
C
a mole.
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 pure substance.
B
the matter is classified as a molecular compound.
C
the matter is classified as a mixture.
D
the matter is classified as a compound.
8) A mixture can be separated
A
by oxidation.
B
physically.
C
by corrosion.
D
by chemical reactions.
9) Heterogeneous mixtures
A
have components so small that they can not be seen with the naked eye.
B
have components evenly distributed all the way down to the particles.
C
do not have the components distributed evenly throughout.
D
include solutions.
10) Homogeneous mixtures have components
A
that are always elemental pure substances.
B
that are not distributed evenly throughout the mixture.
C
which are usually large enough to be seen with the naked eye.
D
evenly distributed all the way down to the particles,whether atoms, molecules, or ions.
*select an answer for all questions
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