Multiple Choice
Which of the following compounds is classified as a pure substance?
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1. Intro to General Chemistry
Classification of Matter
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Which of the following substances is an example of a colloid?
A
Milk
B
Salt water
C
Copper metal
D
Air
Verified step by step guidance1
Understand the definition of a colloid: a mixture where very small particles of one substance are evenly dispersed throughout another substance, and these particles are larger than those in a solution but too small to settle out or be filtered easily.
Review the options given: Milk, Salt water, Copper metal, and Air, and classify each based on their mixture type.
Recognize that salt water is a true solution where salt dissolves completely in water, so it is not a colloid.
Identify copper metal as a pure substance (an element), not a mixture, so it cannot be a colloid.
Understand that air is a homogeneous mixture of gases, which is a solution, not a colloid, whereas milk contains tiny fat droplets dispersed in water, making it a classic example of a colloid.
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