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گیارہویں جماعت · کیمیا · 8 سوالات
نام: ____________________ تاریخ: ____________
For N2 + 3H2 giving 2NH3, the equilibrium constant Kc is:
- A [NH3]2 / ([N2][H2]3)
- B [NH3]2 x [N2][H2]3
- C [NH3] / ([N2][H2])
- D [N2][H2]3 / [NH3]2
Le Chatelier's principle says a system at equilibrium responds to a disturbance by:
- A Increasing the change
- B Opposing the change
- C Stopping
- D Doubling Kc
Adding a catalyst to a reaction at equilibrium:
- A Does not change the value of Kc
- B Changes the value of Kc
- C Doubles the yield
- D Stops the reaction
If Kc is much greater than 1, the equilibrium favours:
- A Products
- B Reactants
- C Neither
- D Catalysts
Raising the temperature of an exothermic reaction at equilibrium shifts it to the:
- A Reactants
- B No shift
- C Catalyst
- D Products
A large value of Kc shows that at equilibrium there are:
- A More products than reactants
- B More reactants than products
- C Equal amounts
- D No reaction
Changing pressure has no effect on the equilibrium of a reaction when:
- A The number of gas moles is equal on both sides
- B The reaction is endothermic
- C A catalyst is added
- D The temperature is low
In the equilibrium constant expression, pure solids and liquids are:
- A Left out
- B Squared
- C Always 10
- D Included as their mass
جوابی کلید
1. A, 2. B, 3. A, 4. A, 5. A, 6. A, 7. A, 8. A
Products over reactants, each raised to its coefficient.
The system shifts to partly oppose the change imposed.
A catalyst speeds both directions equally.
A large Kc means more products at equilibrium.
Heat is a product in an exothermic reaction, so adding heat favours the reactants.
The equilibrium lies towards the products.
Both sides respond equally.
Their concentration is constant.