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Weighing a Coating One Tile at a Time 4 questions
Weighing a Coating One Tile at a Time
Base your answers on the information provided and your knowledge of chemistry. Use the 2025 Chemistry Reference Tables as needed.
A tile workshop estimates the mass of a cured coating from the difference between the mass before coating and the mass afterward. Each balance reading can be up to 0.10 g above or below the true mass. For this task the two reading errors may act in opposite directions.
| Objects on balance | Before coating (g) | After coating (g) |
|---|---|---|
| Tile 1 by itself | 12.2 | 12.3 |
| Ten tiles together, including tile 1 | 122.3 | 123.5 |
Question 1
What is the greatest possible error in either reported mass difference under the stated limit?
- 0.00 g
- 0.10 g
- 0.20 g
- 1.00 g
Question 2
Use the group readings and the error limit to calculate the lowest possible average coating mass per tile.
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The workshop requires at least 0.09 g of coating on every tile. Some tiles may receive thicker coatings than others.
Question 3
Does the group measurement by itself establish that every tile meets the requirement? Explain using a possible distribution of the coating.
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Question 4
Describe a way to check individual tiles, including what a better balance would need to improve.
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