R1.1 Measuring enthalpy changes Quiz
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5 questions, one answer each
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1. 25.0 g of water warms by 4.0 K. How much heat was absorbed?
- A. 100 J
- B. 418 J
- C. 4.18 kJ
- D. 16.7 J
2. Which change is exothermic?
- A. Melting ice
- B. Thermal decomposition of CaCO₃
- C. Burning methane
- D. Dissolving ammonium nitrate
3. In an endothermic reaction, the products are...
- A. lower in enthalpy and more stable
- B. higher in enthalpy and less stable
- C. equal in enthalpy to the reactants
- D. always gases
4. 0.0100 mol of acid is neutralised and 570 J of heat is released. What is ΔH?
- A. −57.0 kJ mol⁻¹
- B. +57.0 kJ mol⁻¹
- C. −5.70 kJ mol⁻¹
- D. −570 kJ mol⁻¹
5. Which is not part of the definition of standard conditions for ΔH⦵?
- A. Pressure of 100 kPa
- B. Substances in their standard states
- C. Solutions at 1 mol dm⁻³
- D. A catalyst is present