Catalysts Quiz
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5 questions, one answer each
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1. A catalyst increases the rate of a reaction because it
- A. increases the energy of the reactant molecules
- B. provides an alternative route with a lower activation energy
- C. makes the reaction more exothermic
- D. increases the concentration of the reactants
2. In a reaction profile for a catalysed reaction, which is the same as for the uncatalysed reaction?
- A. The activation energy
- B. The height of the peak
- C. The energy of the products
- D. The number of steps
3. In heterogeneous catalysis the reactant molecules are first
- A. desorbed from the surface
- B. adsorbed onto the surface
- C. dissolved in the catalyst
- D. converted into products
4. A reaction has ΔH = −90 kJ mol⁻¹ and a forward activation energy of 100 kJ mol⁻¹. What is the reverse activation energy?
- A. 10 kJ mol⁻¹
- B. 90 kJ mol⁻¹
- C. 100 kJ mol⁻¹
- D. 190 kJ mol⁻¹
5. Which is an economic benefit of using a catalyst in a gas-phase industrial process?
- A. It increases the equilibrium yield of product at the same temperature
- B. It makes the reaction exothermic
- C. It allows the process to run at a lower temperature, reducing energy costs
- D. It increases the enthalpy change