Exit Slip: Heat Formula Calculations

Front

What happens to molecular disorder as substances change from solid to liquid to gas?

Back

Molecular disorder increases.

Front

In which direction does heat flow between objects?

Back

Heat flows from warmer to cooler objects.

Front

What is the formula to calculate the change in temperature when heat is added?

Back

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

Front

If 300.0 g of copper absorbs 66,300 J of heat, what is the change in temperature if the specific heat of copper is 0.3845 J/g°C?

Back

580 °C.

Front

How do you calculate the amount of heat needed to raise the temperature of a substance?

Back

Use the formula Q = mcΔT.

Front

What is the specific heat of aluminum?

Back

0.903 J/g°C.

Front

How many joules of heat are needed to raise the temperature of 10.0 g of aluminum from 22.0°C to 55.0°C?

Back

298.0 J.

Front

What is entropy in the context of heat transfer?

Back

Entropy is a measure of molecular disorder or randomness.

Front

What is the relationship between temperature and molecular energy?

Back

As temperature increases, molecular energy increases.

Front

What is the significance of specific heat in heat calculations?

Back

Specific heat determines how much heat energy is required to change the temperature of a substance.