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Separating Zero Error From Scale Error 5 questions
Separating Zero Error From Scale Error
Base your answers on the information provided and your knowledge of chemistry. Use the 2025 Chemistry Reference Tables as needed.
A class tests two balances by weighing four references. Each point shows a known reference mass and the mass displayed by one balance. Between the marked points the class uses the straight-line models shown. Both balances display 22 g for the same 20 g reference.
Question 1
Which recorded observation distinguishes the two balances at the lightest reference?
- A reads 2 g and B reads 0 g.
- A reads 0 g and B reads 2 g.
- Both read 2 g.
- Both read 0 g.
Question 2
Compare how much each display increases when the reference changes from 10 g to 30 g. Show the two differences.
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The class can subtract a constant from every displayed mass as a zero adjustment. It cannot change how much the display increases for a given increase in the reference mass.
Question 3
Which balance can the class correct over the plotted range using only a zero adjustment? Explain using two points or differences from the graph.
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Question 4
Suppose a student subtracts 2 g from every B reading because that fixes the 20 g point. Calculate the corrected reading at 30 g and state the remaining error.
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Question 5
Explain why a calibration check should use more than one reference mass. Use the two records as evidence.
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