Calorimetry Quiz
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5 questions, one answer each
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1. What is the mass m in q = mcΔT when 25.0 cm³ of acid is mixed with 25.0 cm³ of alkali?
- A. 25.0 g
- B. 50.0 g
- C. 1.00 g
- D. 0.0500 g
2. A reaction in 100 g of water gives a temperature rise of 5.0 K. What is q? (c = 4.18 J g⁻¹ K⁻¹)
- A. 20.9 J
- B. 418 J
- C. 2090 J
- D. 20 900 J
3. The temperature rise gives q = 2.09 kJ for 0.0500 mol of reactant. What is ΔH?
- A. +41.8 kJ mol⁻¹
- B. −0.105 kJ mol⁻¹
- C. −418 kJ mol⁻¹
- D. −41.8 kJ mol⁻¹
4. Which is a reason why a calorimetry value for ΔcH is less exothermic than the data book value?
- A. Heat is lost to the surroundings
- B. The water has a high specific heat capacity
- C. The fuel burns completely
- D. The thermometer is too accurate
5. Two thermometer readings each have an uncertainty of ±0.1 °C and ΔT is 8.0 K. What is the percentage uncertainty in ΔT?
- A. 0.0125%
- B. 1.25%
- C. 2.5%
- D. 0.25%