Heat of Fusion and Heat of Vaporization

Front

What is the Heat of Fusion?

Back

The Heat of Fusion is the amount of energy required to change a substance from solid to liquid at its melting point without changing its temperature.

Front

What is the Heat of Vaporization?

Back

The Heat of Vaporization is the amount of energy required to change a substance from liquid to gas at its boiling point without changing its temperature.

Front

What is the specific heat capacity of water?

Back

The specific heat capacity of water is 4.184 J/g°C.

Front

How do you calculate the energy absorbed by a substance when it changes temperature?

Back

Energy (Q) = mass (m) × specific heat capacity (C) × change in temperature (ΔT).

Front

What is the formula to calculate the energy required to melt ice?

Back

Energy required to melt ice = mass (m) × Heat of Fusion (Hf).

Front

If 100 grams of ice at 0°C melts completely, how much energy is absorbed?

Back

33,400 J (using Hf = 334 J/g).

Front

What is the change in temperature when heating water from 10°C to 15°C?

Back

The change in temperature is 5°C.

Front

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

Back

The change in temperature is 50°C.

Front

How do you calculate the energy required to heat a substance?

Back

Energy (Q) = mass (m) × specific heat capacity (C) × change in temperature (ΔT).

Front

What is the specific heat capacity of copper?

Back

The specific heat capacity of copper is 390 J/kg°C.