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- Decreasing the oxygen, as letter C says does not do anything other than simply decrease the<br />
oxygen in the equation.<br />
- Another thing that wouldn’t change a thing would be adding water to the system’s pressure,<br />
that would just add more factors to the pressure but not necessarily mean it would make the<br />
reactants produce the product.<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 />
- Answer C<br />
- The answer is letter C because by increasing the concentration in the flask, that would make<br />
the the reaction happen on the left side of the equation.<br />
- It would not be letter B because raising the pressure would make the reaction shift to the right,<br />
not to the left where we want it to be.<br />
- it would also not be letter D because venting CO2 because that would not shift the reaction like<br />
we want it to shift.<br />
- It would also not make sense to pump carbon dioxide gas into the closed flask, because that<br />
would do something else, but not shift the reaction from the right to the left as the question is<br />
asking to happen.<br />
NH4Cl(s) + heat ⇄ NH3(g) + HCl(g)<br />
14 What kind of change will shift the reaction above to the right to form more products?<br />
A a decrease in total pressure<br />
B an increase in the concentration of HCl<br />
C an increase in the pressure of NH3<br />
D a decrease in temperature<br />
Answer: A<br />
- The answer to this question is letter A because the pressure and the temperature are the two<br />
things to have the biggest effect on an equation like this.<br />
- By increasing the pressure or concentration, the reaction would be moved to the left, so if it<br />
wants to be moved to the right you would have to decrease the pressure, as letter A says.<br />
15 In a sealed bottle that is half full of water, equilibrium will be attained when water molecules<br />
A cease to evaporate.<br />
B begin to condense.<br />
C are equal in number for both the liquid and the gas phase.<br />
D evaporate and condense at equal rates.<br />
- Answer: D<br />
- The answer would be letter D because when water molecules are evaporating but they’re are<br />
being condensed at the same rate, it’s as if nothing is happening to the water molecules.<br />
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