There's

Fe+3 + SCN- <--> FeSCN+2 + heat

then we add heat to it. Which way is it going to shift?

Adding heat will make it shift to use heat which is to the left.

To determine which way the reaction is going to shift when heat is added, we need to consider the reaction's Le Chatelier's principle. According to this principle, when a stress is applied to a reversible reaction at equilibrium, the reaction will shift in a direction that relieves that stress.

In this reaction, heat is considered a stress. When heat is added, it can be thought of as an increase in temperature. To determine the shift, we need to determine whether the reaction is exothermic (heat is a product) or endothermic (heat is a reactant).

In the given reaction, heat is shown as a product. This indicates that the reaction is exothermic, meaning it releases heat when it occurs. When heat is added to an exothermic reaction, the reaction will shift in the direction that consumes heat, trying to counteract the increase.

In this case, adding heat will cause the reaction to shift to the left to consume some of the excess heat. So, when heat is added, the reaction will shift towards the reactant side (left) to lower the temperature and reduce the heat produced.