Exothermic and endothermic reactions and calorimetry Quiz
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5 questions, one answer each
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1. Which of these is an exothermic reaction?
- A. Photosynthesis
- B. Thermal decomposition of calcium carbonate
- C. Burning methane in a Bunsen burner
- D. Dissolving ammonium nitrate to make a cold pack
2. A student heats 50 g of water from 18.0 °C to 38.0 °C. What is the energy transferred? (c = 4.18 J/g/°C)
- A. 4180 J
- B. 1045 J
- C. 2090 J
- D. 4950 J
3. 0.50 g of a fuel heats 100 g of water by 25.0 °C. What is the energy per gram of fuel in kJ/g?
- A. 10.45
- B. 20.9
- C. 41.8
- D. 2.09
4. What is the best reason why a fuel experiment gives a lower energy value than the data book?
- A. The water is too pure
- B. The thermometer is too long
- C. Too much fuel is burned
- D. Heat is lost to the surroundings
5. Which change would improve the accuracy of a fuel experiment?
- A. Using a draught shield around the flame
- B. Using a bigger flame
- C. Using the mass of fuel instead of water in Q = mcΔT
- D. Taking the start temperature after burning