Multiple Choice
Which of the following is the best explanation for the observed color change in a chemical reaction?
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1. Intro to General Chemistry
Chemical Properties
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Water is an example of a compound. Which of the following is the best description of all compounds?
A
They are elements that exist in molecular form.
B
They are mixtures of elements that can be separated by physical means.
C
They are substances composed of two or more different elements chemically bonded together in fixed proportions.
D
They are substances made of only one type of atom.
Verified step by step guidance1
Understand the definition of a compound: A compound is a substance formed when two or more different elements are chemically bonded together in a fixed ratio.
Recognize that elements are pure substances made of only one type of atom, and they can exist as atoms or molecules (like O2), but they are not compounds.
Identify that mixtures are physical combinations of substances that can be separated by physical means, unlike compounds which require chemical methods to separate.
Note that compounds have properties different from the individual elements that compose them because of the chemical bonds formed.
Conclude that the best description of all compounds is that they are substances composed of two or more different elements chemically bonded together in fixed proportions.
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