Specific Heat Problems

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

How do you convert grams to kilograms?

Back

To convert grams to kilograms, divide the number of grams by 1000.

Front

What is the specific heat of aluminum?

Back

The specific heat of aluminum is 900 J/kg°C.

Front

Calculate the heat needed to raise the temperature of 0.25 kg of aluminum by 7°C.

Back

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

Front

What is the change in temperature when cooling from 100°C to 50°C?

Back

The change in temperature is 50°C.

Front

What is the specific heat of water?

Back

The specific heat of water is 4.18 J/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 * (100°C - 50°C) = 105 J.

Front

How much heat is lost when 20 kg of water cools from 25°C to 20°C?

Back

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

Front

How many Joules are required to change 10,000 grams of water from 20°C to 90°C?

Back

Q = mcΔT = 10 kg * 4.18 J/kg°C * (90°C - 20°C) = 2926 J.