Multiple Choice
Which of the following associations is correct regarding the classification of matter?
1. Intro to General Chemistry
Classification of Matter
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Which of the following is a pure substance?
A
Water
B
Granite
C
Sand
D
Air
Verified step by step guidance1
Understand the definition of a pure substance: A pure substance is a material that has a constant composition and has consistent properties throughout the sample. It consists of only one type of particle.
Identify the composition of each option: Water (H₂O) is a compound made of hydrogen and oxygen atoms bonded together. Granite is a mixture of minerals, sand is a mixture of different particles, and air is a mixture of gases.
Recognize that a compound like water is considered a pure substance because it has a definite and fixed composition, unlike mixtures which can vary in composition.
Consider the properties of water: Water has consistent properties such as boiling point, freezing point, and density, which are characteristic of pure substances.
Conclude that water is the only option that fits the definition of a pure substance, as it is composed of a single type of molecule, H₂O, throughout.
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