Enthalpy changes and standard conditions Quiz
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5 questions, one answer each
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1. A reaction mixture gets hotter. Which is correct?
- A. Endothermic, ΔH positive
- B. Exothermic, ΔH negative
- C. Exothermic, ΔH positive
- D. Endothermic, ΔH negative
2. Which is the equation for the standard enthalpy of formation of CO₂?
- A. CO(g) + ½O₂(g) → CO₂(g)
- B. C(g) + 2O(g) → CO₂(g)
- C. C(s) + O₂(g) → CO₂(g)
- D. CH₄(g) + 2O₂(g) → CO₂(g) + 2H₂O(l)
3. What is the standard pressure in enthalpy definitions?
- A. 100 kPa
- B. 1 kPa
- C. 10 kPa
- D. 1000 kPa
4. What is the energy released when 0.50 mol of methane burns (ΔcH = −890 kJ mol⁻¹)?
- A. 178 kJ
- B. 890 kJ
- C. 445 kJ
- D. 1780 kJ
5. Which is the standard enthalpy of formation of an element in its standard state?
- A. Positive
- B. Negative
- C. It depends on the element
- D. Zero