kyojuro

kyojuro

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Polytechnic University of the Philippines

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History5Philosophy3Science5Electrical Engineering51Mechanical Engineering39Sociology11Algebra2Computer Science1Biology15Physics12Finance4Economics2Chemistry350
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Answer: False
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13. A solution contains 3.25 x hydroxide ions. What is the pH of the solution?

A. 3.25

B. 6,51

C. 7.49

D. 8,00

E. none of the above

14. Identify the weakest acid,

A. HCN                  = 62 x  

B. HCOOH              = 1.8 x  

C.              = 72 x

D. HF                    = 66 x

E. All acids are the same strength, as long as they have a dissociable hydrogen ion.

15. The equilibrium system shown below was analyzed and the concentrations of    and were found, in mol/L, to be 4.4, 3.2, 1.5 respectively. The equilibrium constant must be which of the following? 

 

A. 4.0

B. 0.25

C. 0.92

D. 1.1

E. 0.16

 

16. The equilibrium shown below was analyzed and the concentrations of  , and were found in mol/L, to be 4.5, 2.6 and 12. The equilibrium constant must be which of the following? 

 

A. 1.4

B. 0.69

C. 9.8

D. 0.84

E. 1.2, 

 

17. A full syringe contains this equilibrium 

 

If nitrogen dioxide gas is brown and the other gas is colourless, what is observed when the syringe is used to compress this gas mixture?

A. the mixture gets darker

B. the mixture gets lighter

C. no change in colour of the mixture

D. the mixture is colourless

 

18. Consider this equilibrium

 

If some nitrogen gas were injected into this system at constant temperature and pressure the system would most likely experience which of the following?

A. an increase in (hydrogen)

B. a decrease in (ammonial)

C. a decrease in (hydrogen)

D. an increase in (ammonia)

E. both c and d

 

19. Consider the following system at equilibrium

 

    Which of the following actions would cause the   to increase? 

I. increasing the volume at constant pressure and temperature
II. decreasing the volume at constant pressure and temperature
III. increasing the temperature
IV. adding bromine gas at constant temperature and pressure
V. removing ethyne gas at constant temperature and pressure
VI. decreasing the temperature

A. I and II

B. III and VI 

C. IV and V

D. III

E. VI

Answer: 12) [OH-] = 3.25*10^-8 M , pH = -log[H+] , pH + pOH = 14 , pOH = -log[...
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