普通化學2nd會考歷屆考題-96 - 12345567 PDF

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Exam 961_2nd Name___________________________________

MULTIPLE CHOICE. Choose the one alternative that best complete

1) A cylinder of argon gas contains 125 mol at a pressure of 15 argon has been used, the pressure is 136 atm at 27°C. What A) 113 g B) 4.23 × 103 g C) 5.00 × 1 Answer: D Page Ref: Sec. 5.8

2) At 25°C and constant pressure, carbon monoxide gas combi the evolution of 10.1 kJ per gram of carbon monoxide consu reaction? A) 283 kJ/mol B) - 566 kJ/mol C) - 283 kJ Answer: B Page Ref: Sec. 6.4

3) Consider four identical 1.0- L flasks containing the followin sample has the most molecules? A) O2 B) same for all gases C) H2 D) NH 3 E) SO2 Answer: B Page Ref: Sec. 5.6

6) A closed system differs from an isolated system in that A) the closed system exchanges both matter and energy w not. B) the closed system exchanges energy with its surround C) the closed system exchanges neither matter nor energ D) the isolated system exchanges energy with its surroun E) the closed system exchanges matter with its surround Answer: B Page Ref: Sec. 6.2

7) Which of the following is a restatement of Charles' Law (wh A) PV = a B) PV = T C) V/T = a Answer: C Page Ref: Sec. 5.5

8) What is the change in internal energy of a system that has 6 A) - 682 J B) - 197 J C) +682 J Answer: D Page Ref: Sec. 6.3

9) What is the oxidation number of chromium in Cr 2O7- 2 ? A) +2 B) +6 C) +4 Answer: B Page Ref: Sec. 4.4

10) Given the thermochemical equation: 2 NO (g) + O2 (g)  2 NO2

12) When an exothermic reaction is carried out in a coffee- cup A) The temperature of the water decreases. is negative. B) The q H2 O

C) The reaction absorbs heat from the water. D) The enthalpy of the products is lower than that of the E) The enthalpy change for the reaction is positive. Answer: D Page Ref: Sec. 6.5

13) When the following reaction is balanced under acidic condit Mn2+ (aq) + MnO4 - (a

A) 0, H 2O doesn't appear in the balanced equation. B) 2 on right C) 1 on right D) 1 on left E) 2 on left Answer: E Page Ref: Sec. 4.4

14) A sample of helium in a balloon at 24°C has a volume of 1.4 A) 2.11 B) 5.26 C) 1.76 Answer: C Page Ref: Sec. 5.7

15) Which of the following compounds would most likely not b A) C 2H 6 O B) C 7H 8 C) C 6H 12 O

18) Which statement is incorrect regarding reduction? A) Reduction is an increase in oxidation state. B) none of these C) Reduction is the loss of O atoms. D) Reduction is a "gain" of electrons. E) Reduction is always accompanied by oxidation. Answer: A Page Ref: Sec. 4.5

19) Consider a compound that undergoes sublimation (i.e,. solid pressure of one atm. Which of the following could be a heat from 100°C to 150°C?

21) Consider four identical 1.0- L flasks containing the followin gas do the molecules have the highest average velocity? A) H2 B) O2 C) same for all gases D) NH 3 E) SO2 Answer: A Page Ref: Sec. 5.11

22) How does the change in temperature relate to an object's m input of heat? A) inversely, directly B) inversely, inversely C) depends on the object D) directly, inversely E) directly, directly Answer: B Page Ref: Sec. 6.5

23) The element that corresponds to the symbol Ni is _________ A) neon B) nickel C) nitrogen Answer: B Page Ref:

24) Which of the following statements about a system is not tru A) A system is part of the surroundings in the universe. B) A system does not contain work. C) A system does not contain heat

26) When the following reaction is balanced in base with lowest and on which side is the water? Al (s) + ClO- (aq)  Al(O

A) 2 on right B) 2 on left C) 1 on right D) 3 on left E) 0, H 2O doesn't appear in the balanced equation. Answer: D Page Ref: Sec. 4.4

27) Avogadro's number is the number of A) grams in 1 mol of a substance. B) moles in 6.022 × 10 23 grams of an element. C) particles in 1 mol of a substance. D) moles in 6.022 × 10 23 amu of an element. E) amu in 1 mol of a substance. Answer: C Page Ref:

28) The net ionic equation that describes what happens when s A) Ba 2 + (aq) + 2 NO 3- (aq)  Ba(NO3 )2 (s) B) Na+ (aq) + NO3- (aq)  NaNO3 (s) C) none of the above D) Na+ (aq) + OH- (aq)  NaOH (s) B (OH) ( ) E) B 2+( ) + 2 OH- ( )

30) Which is (are) the spectator ion(s) in the following precipita (NH 4)3PO 4 (aq) + Al2(SO4) 3 (aq) 

A) Al 3+, PO 4 B) NH 4+, PO 4-

C) NH 4+, SO 42D) NH 4+ E) Al 3+, SO 4 2Answer: C Page Ref: Sec. 4.3

31) Through which of the following does diffusion occur fastes A) a solution B) The rate of diffusion is not dependent upon the phase C) a gas D) a solid E) a liquid Answer: C Page Ref: Sec. 5.11

32) A barometer indicates that the atmospheric pressure is actu A) 1.011 B) 14.85 C) 102.4 Answer: C Page Ref: Sec. 5.3

33) The compound HA is an acid that is soluble in water. Whic

34) Which statement is incorrect regarding oxidation? A) Oxidation is a "gain" of electrons. B) Oxidation is always accompanied by reduction. C) none of these D) Oxidation is an increase in oxidation state. E) Oxidation is the combination with O atoms. Answer: A Page Ref: Sec. 4.5

35) According to the kinetic molecular theory, kinetic energy is are A) soft. B) elastic. C) rubbery Answer: B Page Ref: Sec. 5.2

36) Which is not an important industrial oxidizing agent? A) O2 B) Cl2 C) KMnO 4 Answer: D Page Ref: Sec. 4.5

37) Which of the following indicates the greatest pressure? A) 12 psi B) 777 torr C) 5.5 mm Answer: B Page Ref: Sec. 5.3

38) A solution has 45.0 mgNa2SO4 /mL. What is the [Na +] in thi A) 0.357 mg Na/mL B) 0.714 mg Na/mL C) 0 634 N / L

39) Given the data in the table below, H°rxn for the reaction IF7 (g) + I 2 (g)  IF5 (g) + 2IF (g) is ________ kJ. Substance IF (g) IF5 (g) IF7 (g)

H f° (kJ/mol) - 95 - 840

- 941

A) 69 kJ B) - 69 kJ C) 311 kJ D) The Hf° of I2 (g) is needed for the calculation. E) - 1991 kJ

Answer: D Page Ref:

40) Which of the following species is a weak base in water? A) KOH B) NH 3 C) Mg(OH Answer: B Page Ref: Sec. 4.2

41) Which reaction type is incorrectly labeled? A) Al3+ (aq) + PO 42- (aq)  AlPO 4 (s), precipitation B) Zn (s) + 2 H+ (aq)  Zn2+ (aq) + H2 (g), oxidationC) NH 3 (aq) + H + (aq)  NH4+ (aq) neutralization

43) Which of the following is NOT part of the kinetic theory of A) Gas particles move rapidly. B) Gas particles move faster when the temperature incre C) There is very little empty space in a gas. D) A gas is composed of very small particles. E) Gas particles do not attract or repel one another. Answer: C Page Ref:

44) Five 22.4 L containers each hold a different gas at STP. The greatest mass, in grams? A) O2 B) CO 2 C) He Answer: B Page Ref: Sec. 5.6

45) Based on the following equations: 2 CO 2 (g)  O2 (g) + 2 CO 2 C(graphite) + O2 (g)  2 C Determine the enthalpy change (H) for the following react C (graphite) + O2 (g

A) 393.5 kJ/mol B) - 787.0 kJ/mol C) 172.5 kJ/mol D) - 393.5 kJ/mol E) 345.0 kJ/mol

A balloon is filled with helium gas. For the question(s) that follow, select the change in conditions.

47) The balloon is put into a chamber whose pressure is less tha temperature. A) C B) B and C C) B Answer: A Page Ref:

48) Considering the following reaction, what statement is incorr Cu (s) + 4 H+ (aq) + 2 NO3- (aq)  Cu

A) Cu is the oxidizing agent. B) Cu2 + is the result of an oxidation. C) NO 3- is reduced. D) Cu is oxidized. E) NO 3- is the oxidizing agent....