Specific Heat Practice

Front

What is specific heat?

Back

Specific heat is the amount of heat required to raise the temperature of 1 gram of a substance by 1 degree Celsius.

Front

What is the formula to calculate heat energy (Q)?

Back

Q = mcΔT, where m is mass, c is specific heat, and ΔT is the change in temperature.

Front

What is the specific heat of water?

Back

The specific heat of water is 4.18 J/(g°C).

Front

How do you calculate the heat energy needed to heat water from 25°C to 100°C?

Back

Use the formula Q = mcΔT. For 2400g of water, Q = 2400g * 4.18 J/(g°C) * (100°C - 25°C) = 752,400 J.

Front

What is the specific heat of aluminum?

Back

The specific heat of aluminum is 0.21 cal/g°C.

Front

How much heat is released when a 10g piece of aluminum cools from 100°C to 50°C?

Back

Q = mcΔT = 10g * 0.21 cal/g°C * (100°C - 50°C) = 105 J.

Front

What is the specific heat of copper?

Back

The specific heat of copper is 0.39 J/g°C.

Front

How do you find the mass of a substance if you know the heat absorbed and the specific heat?

Back

Rearrange the formula Q = mcΔT to find m: m = Q / (cΔT).

Front

If 20g of copper absorbs 100 Joules while heating from 30°C to 98°C, what is the temperature change?

Back

ΔT = 98°C - 30°C = 68°C.

Front

What is the heat energy transferred when 20g of water cools from 25°C to 20°C?

Back

Q = mcΔT = 20g * 4.18 J/(g°C) * (20°C - 25°C) = -418 J (heat lost).