heat and temperature. the difference heat – the energy that flows from hot to cold. measured in...

Heat and Temperature

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Heat and Temperature

The difference

• Heat – the energy that flows from hot to cold.

• Measured in Joules (J) or calories (cal).

• Temperature – measure of average kinetic energy.

• Measured in Celsius (C) or Kelvins (K).

Page 3: Heat and Temperature. The difference Heat – the energy that flows from hot to cold. Measured in Joules (J) or calories (cal). Temperature – measure of

What factors affect the amount of heat flow?

• Mass (m) – grams, kilograms

• Change in temperature (T) – Kelvins

• Specific heat (C) – amount of heat required to raise the temperature of 1 g of a substance 1 degree. Different substances have different C values! Values in reference tables.

Page 4: Heat and Temperature. The difference Heat – the energy that flows from hot to cold. Measured in Joules (J) or calories (cal). Temperature – measure of

Calculations

Q = CmT

Heat Specificheat Mass Change

In Temp.

Page 5: Heat and Temperature. The difference Heat – the energy that flows from hot to cold. Measured in Joules (J) or calories (cal). Temperature – measure of

Practice Problems1. How much heat is lost when a solid aluminum ingot with a mass of 4110 g cools from 660oC to 25oC? (Cp for Al =

0.9025 J/goC)

2. If 7.5 x 104J of energy are released when 500 g of a metal cools from 100.0oC to 20.0oC, what is the specific heat of the

metal?

Page 6: Heat and Temperature. The difference Heat – the energy that flows from hot to cold. Measured in Joules (J) or calories (cal). Temperature – measure of

How is this measured in lab?

• Calorimetry– Calorimeter– Measures the heat

change in a chemical reaction

– Closed system– Heat lost = heat gained

calculations

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