Measuring enthalpy changes Quiz
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5 questions, one answer each
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1. 50.0 g of water is heated from 20.0 °C to 30.0 °C. What is the energy transferred? (c = 4.18 J g⁻¹ K⁻¹)
- A. 209 J
- B. 2090 J
- C. 20.9 J
- D. 4.18 J
2. In a spirit burner experiment, which change would bring the experimental value closer to the data book value?
- A. More heat loss
- B. Using a lid to reduce evaporation
- C. Incomplete combustion
- D. Heat absorbed by the can being ignored
3. The temperature of 100 g of solution rises by 5.0 K when 0.020 mol reacts. What is ΔH? (c = 4.18 J g⁻¹ K⁻¹)
- A. −104.5 kJ mol⁻¹
- B. +104.5 kJ mol⁻¹
- C. −10.45 kJ mol⁻¹
- D. −2.09 kJ mol⁻¹
4. Why is the cooling line extrapolated back to the time of mixing?
- A. To find the specific heat capacity
- B. To correct for heat loss and find the maximum temperature change
- C. To measure the rate of reaction
- D. To calculate the moles
5. Which is a source of error specific to a spirit burner experiment?
- A. Use of a polystyrene cup
- B. Evaporation of fuel from the wick
- C. The density of the solution
- D. Using a pipette