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addition to this,in order for it to remain the same, nothing must be added to the chemical reaction.<br />
11 In which of the following reactions involving gases would the forward reaction be favored by an<br />
increase in pressure?<br />
A A + B ⇄AB<br />
B A + B ⇄ C + D<br />
C 2A + B ⇄ C + 2D<br />
D AC ⇄ A + C<br />
Question 11: In order to understand this problem, we must look at<br />
Le Chatelier’s principle. Le Chatelier’s principle can predict the effect<br />
of a change in conditions on a chemical equilibrium. Additionally, the<br />
equilibrium will shift in a direction that will decrease the pressure of<br />
each gas closer to what it was originally. Therefore, if the pressure<br />
of A, B, and AB are increased, then the equilibrium will shift and<br />
decrease the total number of molecules and decrease the pressure.<br />
On the other hand, the rest of the equations would end up having an<br />
equal number of molecules on each side, causing there to be no<br />
shift whether pressure is increased or decreased. Therefore, the<br />
answer will be A.<br />
12 Which action will drive the reaction to the right?<br />
A heating the equilibrium mixture<br />
B adding water to the system<br />
C decreasing the oxygen concentration<br />
D increasing the system’s pressure<br />
4HCl(g) + O2(g) ⇄ 2H2O(l) + 2Cl2(g) + 113 kJ<br />
Question 12: Looking at the equation 4HCl(g) + O2(g) ⇄ 2H2O(l) + 2Cl2(g) + 113 kJ, increasing the<br />
systems pressure will direct it to shift to the right. It states that an increase of pressure in a system will<br />
shift towards fewer molecules of gas. This is based off Le Chatelier’s principle, which is used to<br />
predict the effect of a change in conditions on a chemical equilibrium. Therefore, Le Chatelier’s<br />
principle demonstrates that considering that equation, increasing the system’s pressure will cause it<br />
to shift to the right of the container it is being held in. The answer to this question is D.<br />
NO2(g) + CO(g) ⇄ NO(g) + CO2(g)<br />
13 The reaction shown above occurs inside a closed flask. What action will shift the reaction to the<br />
left?<br />
A pumping CO gas into the closed flask<br />
B raising the total pressure inside the flask<br />
C increasing the NO concentration in the flask<br />
D venting some CO2 gas from the flask<br />
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