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Choosing Where to Read a Warming Sample 4 questions
Choosing Where to Read a Warming Sample
Base your answers on the information provided and your knowledge of chemistry. Use the 2025 Chemistry Reference Tables as needed.
A class warms a model liquid in a holder. It wants to stop heating when the liquid reaches 35 °C. One probe measures the holder’s outside surface and another measures the liquid. Both probes have passed the same reference checks.
| Elapsed time (min) | Holder reading (°C) | Liquid reading (°C) |
|---|---|---|
| 2 | 35 | 28 |
| 4 | 39 | 32 |
| 6 | 42 | 35 |
Question 1
Which reading supports stopping at six minutes in this model?
- The holder reads 35 °C at two minutes.
- The liquid reads 32 °C at four minutes.
- The liquid reads 35 °C at six minutes.
- The holder reads 42 °C at six minutes.
Question 2
If the class stops when the holder first reads 35 °C, what error does it make in estimating the liquid’s temperature? Use the table.
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In a second setup the class suspects the liquid near the bottom warms sooner than liquid near the top. It has two matched probes.
Question 3
Describe a test using those probes to check for different temperatures in the liquid.
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Question 4
If the class requires both measured locations to reach 35 °C, explain why a reading of 35 °C near the bottom alone cannot confirm that requirement.
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