Question detail
What is the main difference between potable water and chemically pure water?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Using the Earth's resources and obtaining potable water
Question
- A. Potable water contains no dissolved salts
- B. Chemically pure water is safe to drink
- C. Potable water has low levels of dissolved salts and microbes
- D. Chemically pure water has high levels of microbes
Answer
The correct option is Potable water has low levels of dissolved salts and microbes. This answer is correct because it matches the approved learning objective to distinguish potable water from chemically pure water in the subtopic Potable water.
Explanation
The correct option is Potable water has low levels of dissolved salts and microbes. Potable water has low levels of dissolved salts and microbes is correct because it directly supports the approved learning objective to distinguish potable water from chemically pure water. This belongs to the subtopic Potable water within Using the Earth's resources and obtaining potable water, so the explanation must stay tied to that curriculum context. The other options are incorrect because they either do not answer this learning objective, use a vague statement, or move away from Potable water.
Common mistake
Confusing Potable Water with Pure Water
Students often think that potable water is the same as chemically pure water, not realizing that potable water can contain dissolved substances that make it safe to drink.
Remember that potable water is safe for consumption and may have low levels of dissolved salts and microbes, while chemically pure water contains no impurities.
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