Enthalpy changes and standard conditions Quiz
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5 questions, one answer each
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1. Which describes an endothermic reaction?
- A. ΔH negative; the surroundings warm
- B. ΔH negative; the surroundings cool
- C. ΔH positive; the surroundings cool
- D. ΔH positive; the surroundings warm
2. Which is the correct equation for the standard enthalpy change of combustion of methane?
- A. CH₄(g) + 2O₂(g) → CO₂(g) + 2H₂O(l)
- B. CH₄(g) + 2O₂(g) → CO₂(g) + 2H₂O(g)
- C. 2CH₄(g) + 4O₂(g) → 2CO₂(g) + 4H₂O(l)
- D. C(s) + 2H₂(g) → CH₄(g)
3. Which equation shows the standard enthalpy change of formation of carbon dioxide?
- A. CO(g) + ½O₂(g) → CO₂(g)
- B. C(s) + O₂(g) → CO₂(g)
- C. C(g) + O₂(g) → CO₂(g)
- D. 2C(s) + 2O₂(g) → 2CO₂(g)
4. What feature is shown on a reaction profile but not on an enthalpy level diagram?
- A. ΔH
- B. Reactants
- C. Products
- D. Activation energy
5. Why must the temperature and pressure be stated when quoting an enthalpy change?
- A. The enthalpy change depends on them
- B. They change the formula of the products
- C. They make reactions exothermic
- D. They are needed to balance the equation