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17 Two substances in a mixture differ in density and particle size. These properties can be used to(1) separate the substances
(2) chemically combine the substances
(3) determine the freezing point of the mixture
(4) predict the electrical conductivity of the mixture

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If they're different sizes and densities, you are able to separate the substances. 

Answer:The correct answer is option (1).

Explanation:

Density is defined as mass of substance present in the unit volume of the substance.

Density can be used to separate two substance from their mixture. Substance with lower density will place itself on the top of the substance with higher density, And in order to distinguish those two substance from each other one can easily observe the boundary among those substance.

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