PS-3.4 Pure Substances/mixtures: Question Preview (ID: 2827)


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Substances that have unique, identifying properties are called
a) pure substances. b) heterogeneous mixtures. c) homogeneous mixtures. d) mixtures.
There are two types of pure substances;
a) elements and compounds. b) homogeneous and heterogeneous mixtures. c) compounds and mixtures. d) elements and mixtures.
An element is a pure substance which is composed of only
a) one type of atom. b) heterogeneous mixtures. c) homogeneous mixtures. d) one type of moecule.
A compound is a pure substance which is composed of
a) more than one type of element. b) two or more component substances which retain their own identifying properties. c) only one type of element. d) only one type of atom.
Compounds can be decomposed into elements only by
a) chemical reactions. b) chromatography. c) filtration. d) evaporation.
Compounds have a definite chemical composition identified by
a) a chemical formula. b) a mole. c) a baby formula. d) a physical formula.
When matter is composed of two or more component substances which retain their own identifying properties,
a) the matter is classified as a mixture. b) the matter is classified as a compound. c) the matter is classified as a pure substance. d) the matter is classified as a molecular compound.
A mixture can be separated
a) physically. b) by chemical reactions. c) by corrosion. d) by oxidation.
Heterogeneous mixtures
a) do not have the components distributed evenly throughout. b) have components evenly distributed all the way down to the particles. c) include solutions. d) have components so small that they can not be seen with the naked eye.
Homogeneous mixtures have components
a) evenly distributed all the way down to the particles,whether atoms, molecules, or ions. b) which are usually large enough to be seen with the naked eye. c) that are not distributed evenly throughout the mixture. d) that are always elemental pure substances.
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