Multiple Choice
Which of the following is an example of a pure substance?
1. Intro to General Chemistry
Classification of Matter
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Which statement correctly describes compounds?
A
Compounds are pure substances that can be separated into their components by filtration.
B
Compounds consist of a single element in various forms.
C
Compounds are mixtures of elements that can be separated by physical means.
D
Compounds are substances composed of two or more elements chemically combined in fixed proportions.
Verified step by step guidance1
Understand the definition of a compound: A compound is a pure substance composed of two or more elements that are chemically combined in fixed proportions.
Recognize that compounds cannot be separated into their components by physical means such as filtration. Instead, chemical methods are required to break the bonds between the elements.
Differentiate between compounds and mixtures: Mixtures consist of two or more substances that are physically combined and can be separated by physical means, whereas compounds are chemically combined.
Identify that compounds do not consist of a single element in various forms. Instead, they are made up of different elements bonded together.
Conclude that the correct statement about compounds is that they are substances composed of two or more elements chemically combined in fixed proportions.
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