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Comparing Methods for a Dry Mass Test 4 questions
Comparing Methods for a Dry Mass Test
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A class compares three methods for estimating the dry mass of a wet mineral sample. It tests a reference that contains 10.0 g of dry mineral plus water. A usable method must finish within 12 minutes and give a reading within 0.2 g of the reference dry mass.
| Method | Time (min) | Reported dry mass (g) |
|---|---|---|
| A | 8 | 9.9 |
| B | 14 | 10.1 |
| C | 9 | 10.4 |
Question 1
Which method meets both requirements in this test?
- A only
- B only
- C only
- A and B
Question 2
Explain why the reference is useful for comparing two readings that differ from each other.
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The class repeats C with matched samples. It weighs one immediately and the other after five minutes in humid air. The delayed sample gives a greater mass.
Question 3
Explain why the higher delayed mass is consistent with water returning to the mineral.
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Question 4
Describe a control that would help distinguish the effect of humid air from the effect of waiting itself.
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