Which of the following is an example of a pure substance?
Understand the Problem
The question is asking us to identify an example of a pure substance, which is a material that has a uniform and definite composition.
Answer
Water, ammonia, nitrogen dioxide, and carbon dioxide
Water, ammonia, nitrogen dioxide, and carbon dioxide
Answer for screen readers
Water, ammonia, nitrogen dioxide, and carbon dioxide
More Information
Pure substances are materials that have a constant composition and cannot be separated into components by physical methods. This includes elements and compounds.
Tips
A common mistake is confusing pure substances with mixtures or solutions, which can have variable compositions.
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