Multiple Choice
Why do the minerals in a geode typically form euhedral crystals rather than anhedral grains?
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1. Intro to General Chemistry
Classification of Matter
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Which of the following samples is a pure substance?
A
Soil
B
Sugar dissolved in water
C
Zinc oxide
D
Pond water
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Understand the definition of a pure substance: A pure substance has a fixed composition and distinct chemical properties. It consists of only one type of particle, either an element or a compound.
Analyze each option to determine if it meets the criteria of a pure substance:
Soil is a mixture of various minerals, organic matter, and other components, so it is not a pure substance.
Sugar dissolved in water forms a homogeneous mixture (solution), which contains more than one substance, so it is not pure.
Zinc oxide is a chemical compound with a fixed composition and uniform properties, making it a pure substance.
Pond water contains various dissolved substances, microorganisms, and particles, so it is a mixture, not a pure substance.
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