Heat of Fusion, Heat of Vaporization, and Specific Heat

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

Define Specific Heat.

Back

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

Front

What is the formula to calculate heat energy?

Back

Q = m c ∆T, where Q is heat energy, m is mass, c is specific heat, and ∆T is the change in temperature.

Front

If a substance has a low specific heat, what does that imply about its heating?

Back

A substance with a low specific heat requires less energy to heat up and heats up faster.

Front

What does a high specific heat indicate about a substance?

Back

A high specific heat indicates that the substance requires more energy to heat up and heats up slower.

Front

Calculate the mass of iron if it receives 50 J of heat energy and its temperature increases by 25.0°C with a specific heat of 0.10 J/g°C.

Back

Mass = 20 g.

Front

Which material would have the smallest change in temperature when equal masses are heated with the same amount of energy?

Back

Carbon Steel.

Front

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

Back

The change in temperature is 5 °C.

Front

What is the relationship between heat energy and temperature change?

Back

Heat energy is directly proportional to the temperature change of a substance.