How much heat is needed to raise the temperature of 75 g of a substance by 15 c when the specific heat is 0.92 j/g-c?

Answer is: 1035 joules of heat is needed.
m(substance) = 75 g.
ΔT(substance) = 15°C.
cp(substance) = 0,92 J/g°C.
Q = m(substance) · ΔT(substance) · cp(substance).
Q = 75 g · 15°C · 0,92 J/g°C.
Q = 1035 J = 1,035 kJ.

Heat is involved in chemical change in two ways; chemical changes either result in heat being added to or removed from an object, and chemical changes require a certain amount of heat before they can take place.