Calorimetry Quiz
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5 questions, one answer each
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1. A solution of mass 80.0 g rises in temperature by 5.0 °C. What is q? (c = 4.18 J g⁻¹ °C⁻¹)
- A. 400 J
- B. 335 J
- C. 1672 J
- D. 16.7 J
2. A thermometer reads to ±0.5 °C. What is the absolute uncertainty in a temperature change found from two readings?
- A. ±0.25 °C
- B. ±0.5 °C
- C. ±1.0 °C
- D. ±2.0 °C
3. An experiment has a temperature rise of 12.0 °C measured with ±1.0 °C uncertainty. What is the percentage uncertainty in ΔT?
- A. 1.0%
- B. 12%
- C. 0.12%
- D. 8.3%
4. On a temperature–time graph, which temperature is used to find ΔT after a cooling-curve correction?
- A. The highest point recorded
- B. The extrapolated temperature at the time of mixing
- C. The last temperature recorded
- D. The mean of all readings
5. Burning 0.46 g of ethanol (Mr 46.0) heats 100.0 g of water by 30.0 °C. What is the experimental ΔcH? (c = 4.18)
- A. –1254 kJ mol⁻¹
- B. –125 kJ mol⁻¹
- C. –12.5 kJ mol⁻¹
- D. +1254 kJ mol⁻¹