Lakeland Heat/Equilibrium Review

1. Lakeland Heat/Equilibrium Review

2. Click on a question to begin

3. Question 1

4. Try Again • Heat is a reactant so the addition of it should shift the equation away from that side Try Again

5. Correct! • The addition of heat, a reactant, will shift the equilibrium right and cause the amount of NO2 to increase Next Question

6. Question 2

7. Try Again • Think about what is equal at equilibrium Try Again

8. Correct! • Equilibrium means the rate of the forward reaction equals the rate of the reverse reaction Next Question

9. Question 3

10. Try Again • The heat is a product in the reaction, so it is exothermic. There are two moles of H2O in the equation but the question is asking about one mole. Try Again

11. Correct! • 2 moles of H2O produce -571.6 kJ of heat, so one mole of H2O produces -285.8 kJ Next Question

12. Question 4

13. Try Again • Endo means in to and exo means out of Try Again

14. Correct! • An exothermic reaction is always a release of energy and ΔH will be negative Next Question

15. Question 5

16. Try Again • The addition of a catalyst lowers the activation energy Try Again

17. Correct! • The addition of a catalyst lowers the activation energy which increases the rate of both the forward and reverse reactions Next Question

18. Question 6

19. Try Again • Remember that Keq = products/reactants Try Again

20. Correct! • 1 x 10-1 is the largest number so must contain the highest ratio of products to reactants Next Question

21. Question 7

22. Try Again • The reverse reaction goes from right to left so the heat is going to be a product Try Again

23. Correct! • The reverse reaction has heat as a product which is exothermic. Next Question

24. Question 8

25. Try Again • The heat of the reaction is found by finding the difference between the heat of the products (end of the graph) and the heat of the reactants (start of the graph) Try Again

26. Correct! • The heat of the products (40 kJ) minus the heat of the reactants (20 kJ) is equal to 20 kJ Next Question

27. Question 9

28. Try Again • Activation energy is the energy added to the reactants to get the reaction going. Endothermic is a gain of energy, exothermic is a loss. Try Again

29. Correct! • The reactants gained 10 kJ of energy at the start and overall the reaction lost energy which is exothermic Next Question

30. Question 10

31. Try Again • Convert grams to moles and then moles to heat using the balanced equation Try Again

32. Correct! • 4.56 g O2 x 1 mol O2 x -571.6 kJ = -81.45 kJ 32 g O2 1 mol O2 Next Question

33. Question 11

34. Try Again • PbCO3 adds CO32- ions which are a product. Equilibrium should shift left Try Again

35. Correct! • Adding PbCO3 adds CO32- ions which shifts equilibrium left. This should reduce the amount of products and increase the amount of reactants Next Question

36. Question 12

37. Try Again • Shifting equilibrium to the right will require addition of reactants, removal of products or a change in pressure(depends on number of moles) Try Again

38. Correct! • Increasing pressure shifts equilibrium to the right since there are fewer number of moles of gas on the right Next Question

39. Question 13

40. Try Again • Convert grams to moles and then moles to heat using the balanced equation Try Again

41. Correct! • 6.34 g N2 x 1 mol N2x -91.8 kJ = -20.79 kJ 28 g N2 1 mol N2 Next Question

42. Question 14

43. Try Again • Products/reactants Try Again

44. Correct! Products over reactants raised to their coefficients Next Question

45. Question 15

46. Try Again • Activation energy is the energy added to reactants to get the reaction to begin Try Again

47. Correct! • B represents the change in energy needed to start the reaction Next Question