Practice Quiz

SAT Chemistry

Category - Multiple Choice

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Consider the following system at equilibrium:

2CO(g) + O2(g) --> 2CO2(g)

According to Le Chatelier’s Principle, what will occur when the concentration of CO2(g) is increased?

  1. The concentration of O2 alone will increase
  2. The concentration of CO alone will increase
  3. The concentration of both O2 and CO will increase
  4. The concentration of O2 and CO will decrease
  5. There will be no change of concentrations
Explanation
Answer: The concentration of both O2 and CO will increase.


According to Le Chatelier’s Principle, stress on an equilibrium will shift the equilibrium in the opposite direction to reduce the stress. An increase in the concentration of CO2(g) stresses the equilibrium. To reduce this stress, there is a resulting increases in the concentrations of both CO and O2(g).
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