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If the reaction requires heat (endothermic), then the reaction will favor products and more products are made therefore affecting K. If the reaction gives off heat (exothermic), then the reaction favors reactant formation and K will be affected.
You compare heat in endothermic reactions to a reactant (since it is required to start the reaction) and heat in exothermic reactions to a product (it is produced by the reaction). If you increase a reactant, more product will form, as in adding heat to an endothermic reaction. If you increase products, more reactant forms, as in adding heat to an exothermic reaction.
The above answers are correct. Remember to also keep in mind the difference between K and Q. K is adjusted by temperature, but it is not adjusted by concentrations of reactants or products. Instead, changing concentrations would change Q. K is always a constant at constant temperature, hence why when you change the temperature, the constant changes.
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