Quiz 12 (sec. 3)

Ionic equilibrium found in:

• HCl 0.1 M

• pure CH₃COOH 100%

• CH₃COOH (0.1 M)

• NaOH 0.2 M

H_2(g) + CO_2(g) = H₂O_(v) + CO_(g) , H = 41 kJ

Amount of hydrogen gas increases by:

• Heating

• decrease pressure

• add catalyst

• no correct answer

Which of the following represent the highest rate of reaction between equal masses of CaCO₃ with nitric acid?

• b

• c

• a

• d

The following graph represents the reaction without using catalyst. X_(g) + Z_(g) ⇌ Y_(g) By adding catalyst…………

• Decrease level B & C

• Increase level D & A

• Decrease level B & D

• Increase level E & B

The equilibrium constant of this reaction:
SnO2(s) + 2CO(g) = Sn(s) + 2CO2(g) is ……………

• Kc =  $\frac{\left[CO_2\right]}{\left[CO\right]}$  

• Kc = $\frac{\left[CO_2\right]^2}{\left[CO\right]^2}$  

• Kc = $\frac{\left[Sn\right]\left[CO_2\right]^2}{\left[SnO_2\right]\left[CO_2\right]}$  

• Kc = $\frac{\left[Sn\right]\left[CO_2\right]^2}{\left[CO\right]^2}$  

Which of the following graphical figures does represent the relation between K_p of a gaseous equilibrium reaction and the external pressure applied to it at a constant temperature?

• B

• C

• D

• A

In the equilibrium reaction:

N_2(g) + 3H_2(g) = 2NH_3(g)

What is the choice which represents the relation between the rate of the backward and forward reactions on adding a catalyst?

• B

• D

• A

• C

the following figure represent for rate of chemical reaction, which of the following represent this reaction ?

• X_(g) = Y_(g) + Z _(g)

• 2Y_(g) + Z _(g) = X_(g

• Y_(g) + Z _(g) = X_(g)

• X_(g) = 2Y_(g) + Z _(g)

Two equal masses of iron metal : 1^st mass divided into cubes of edge length = 1 cm 2^nd mass divided into cubes of edge length = 1/2 cm then by adding HCl 0.1 molar to each mass so :

• reaction of 1^st mass is faster

• we cannot determine which is faster

• they are equal rates

• reaction of 2^nd mass is faster

mount of HI placed in a closed vessel at constant temperature it decomposes as the following reaction: 2HI_(g) ⇋ H_2(g) + I_2(g) Kc= 0.018

Which one of the figures represents the movement of the reaction to equilibrium state.

• C

• D

• B

• A