CHM 203 CBT PRACTICE TEST

1. Calculate the standard entropy change for the following reaction, 2Ag2O(s) ➡️4 Ag(s) + O2(g); given S^{o}[Ag2O] = 121.3 J/K·mol, S^{o}[Ag(s)] = 42.6 J/K·mol, and S^{o}[O2(g)] = 205.1 J/K·mol.

2. Rusting of iron Is an example of________ reaction

3. Thermodynamics can be used to determine all of the following EXCEPT

4. Predict the signs of 🔼H and 🔼S for the evaporation of water at 35 ^oC.

5. Of the following product-favoured processes, which are endothermic? 1. the combustion of methane to produce water and carbon dioxide. 2. the expansion of an ideal gas. 3. the melting of ice at temperatures greater than 0ºC.

6. When extra NH3 is added to the following system at equilibrium: 3H2(g) + N2(g) ➡️ 2 NH3(g), what happens?

7. A statement of the second law of thermodynamics is that

8. If the reaction A + B C has an equilibrium constant greater than one, which of the following statements is correct?

9. A reaction with a negative value of 🔼G is said to be

10. Which of these is true of an isochoric system?

11. Powdered marble reacts more rapidly with HCl than the chips of marble because:

12. Which reaction is likely to have a negative change in entropy?

13. One mole of an ideal gas is heated at a constant pressure of 101300 N $m^{2}$, from 273.2 K to 373 K. Calculate the work involved R = 8.314 J/mol/K).

14. If a chemical reaction has a positive change in entropy, 🔼S, then

15. All of the following statements concerning entropy are true EXCEPT

16. The first law of thermodynamics deals with

17. The heat of combustion for 1 mole of carbon to carbon dioxide is -410 kJ. How many kJ of heat would be liberated from the complete combustion of 60.0 g of carbon?

18. Which of these followings would lead to an increase in the internal energy of a system?

19. The temperature remains constant as energy is added to a substance. How may the substance be changing?

20. If a gas absorbs 1000 J of heat and expands by 0.5 $dm^{3}$ against a constant pressure of 4 atms (1 atm = 100000 Pa), then the change in internal energy is approximately

21. The reactions with the high value of energy of activation are

22. Calculate the standard entropy change for the following reaction, 2 Ag2O(s) ➡️4 Ag(s) + O2(g)

given S^{o}[Ag2O] = 121.3 J/K·mol, S^{o}[Ag(s)] = 42.6 J/K·mol, and S^{o}[O2(g)] = 205.1 J/K·mol.

23. Which of the following expressions is associated with the law of conservation of energy?

24. In the reaction: 2B ➡️Product; the rate equation is: Rate = k[B]. If the concentration of is doubled, the rate of reaction will increase by a multiple of

25. Every type of chemical bond contains a certain amount of energy. The total bond energy, which is essentially equivalent to the total potential energy of the system, is a quantity known as:

26. For a reaction: 2H2+ 2NO ➡️2H2O + N2 the rate law is R = K [H2][NO]^2 The Order of the reaction is?

27. In a reaction: 2A ➡️B + 2C, which of the statement is true?

28. The specific heat of silver is 0.0565 $cal/g/^{o}C$. Assuming no loss of heat to the surroundings or to the container, calculate the final temperature when 100 g of silver at 40 $^{o}C$ is immersed in 60 g of water at 10 $^{o}C$.

29. In a reaction in which the rate of the reverse reaction is equal to the rate of the forward reaction, a state of ____________ is attained.

30. Which of the following involves a decrease in entropy?

31. If a process is exothermic and not spontaneous, then what must be true?

32. Which of the following statements about enthalpy is incorrect?

33. All of the following processes lead to an increase in entropy EXCEPT

34. The common-ion effect

35. The minimum additional energy, above the average internal energy, which the reacting molecules must possess so that their collision result in a reaction is known as

36. A beaker with a mixture of ice and water is maintained at equilibrium: H2O(s) + heat➡️H2O(l); If the temperature of the system is decreased:

37. Milk sours more rapidly in summer than in winter because

38. Which of the following statements about the kinetics of the reaction H2(g) + Br2(g) ➡️2HBr(g) is definitely true?

39. The reactions catalyzed by sunlight are called ____________ reactions