Multiple Choice
Which of the following is a characteristic of colloid particles?
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1. Intro to General Chemistry
Classification of Matter
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Which of the following substances cannot be broken down by a chemical change?
A
Water (H_2O)
B
Gold (Au)
C
Carbon dioxide (CO_2)
D
Oxygen (O_2)
Verified step by step guidance1
Understand the concept of chemical change: A chemical change involves breaking down a substance into simpler substances or elements through a chemical reaction.
Identify the substances given: Water (H\_2O), Gold (Au), Carbon dioxide (CO\_2), and Oxygen (O\_2).
Recognize that substances composed of elements in their simplest form (pure elements) cannot be broken down further by chemical means. These are called elements.
Note that Water, Carbon dioxide, and Oxygen are compounds or molecules made of more than one element and can be broken down chemically into their constituent elements.
Gold (Au) is a pure element and cannot be broken down into simpler substances by chemical change, so it is the substance that cannot be broken down chemically.
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