Specific Heat Practice

Front

What is specific heat?

Back

Specific heat is the amount of heat required to raise the temperature of 1 kg of a substance by 1°C.

Front

What is the formula to calculate heat (Q)?

Back

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

Front

Calculate the heat needed to raise the temperature of 0.25 kg of aluminum by 7°C (c=900 J/kg°C).

Back

Q = mcΔT = 0.25 kg * 900 J/kg°C * 7°C = 1575 J.

Front

What is the specific heat of water?

Back

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

Front

How much heat energy is released when 20 g of water cools from 25°C to 20°C?

Back

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

Front

What is the specific heat of aluminum?

Back

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

Front

Calculate the heat released when a 10 g piece of aluminum cools from 100°C to 50°C.

Back

Q = mcΔT = 10 g * 0.21 cal/g°C * (50°C - 100°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 much heat is absorbed by a 20 g chunk of copper heated from 30°C to 98°C?

Back

Q = mcΔT = 20 g * 0.39 J/g°C * (98°C - 30°C) = 100 J.

Front

What is the temperature change (ΔT) when 100 Joules of heat is added to 20 grams of copper?

Back

ΔT = Q / (mc) = 100 J / (20 g * 0.39 J/g°C) = 12.82°C.