If you use half as many moles of reactant *then:
you'll make twice as much money
the reaction won't happen
the reaction will release half as much heat
the reaction will absorb heat

The reaction will release half as much heat

Explanation:

Because there are less reactants the amount of energy released will decrease. Because the reactants halves the amount of heat released also halves.

the answer is:  

line graphs show patterns in data with variables that change over time; whereas, circle graphs show data as parts out of a whole (such as out of 100%).

i think that the answer is c