This question may require the use of the Chemistry
Reference Tables or the Periodic
Table of Elements.|
Given the reaction at equilibrium:
2CO(g) + O2(g) <-> 2CO2(g)
When the reaction is subjected to stress, a change will occur in the concentration of
both reactants and products
neither reactants nor products
Correct Answer Number: 3
Explanation: This question can be solved several different ways. First by logic: pretend you become a new cable subscriber (a change or stress is added to your life). This will also affect the number of hours you watch TV (reaction). The reverse is also true: stop the cable and you probably will watch less TV. Only choice 3 makes sense. Remember the math rule? Whatever you do to one side of the equation, effects the other side.
Second way: Le Chatelier's principle applies here (if a stress like a change in temperature or concentration is added to a system at equilibrium, the reaction is shifted in a way that uses up the stress). If more CO(g) and O2(g) were added, more CO2(g) would result.
If more product, CO2(g), was added, the concentration of the reactants would increase by using up the excess product and changing it back to CO(g) + O2(g. See also question #13 and #15, this topic.