Multiple Choice
Which of the following substances is an example of a colloid?
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1. Intro to General Chemistry
Classification of Matter
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Which of the following observations would indicate that a material is a pure substance?
A
The material is composed of visibly different phases.
B
The material can be separated into two components by filtration.
C
The material shows variable boiling points depending on the sample.
D
The material has a constant melting point.
Verified step by step guidance1
Understand the definition of a pure substance: A pure substance has a fixed composition and distinct, constant physical properties such as melting point and boiling point.
Analyze the observation 'The material is composed of visibly different phases': This suggests the material is a mixture, not a pure substance, because pure substances are uniform throughout.
Consider 'The material can be separated into two components by filtration': Filtration separates mixtures, so this indicates the material is not pure.
Look at 'The material shows variable boiling points depending on the sample': Variable boiling points imply different compositions, characteristic of mixtures, not pure substances.
Recognize that 'The material has a constant melting point' is a key indicator of purity, because pure substances melt at a specific temperature, unlike mixtures which melt over a range.
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