P.S 9.4 Specific Heat Calculations

Front

What is specific heat?

Back

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

Front

What is the formula to calculate heat energy (Q)?

Back

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

Front

How do you calculate the temperature change (ΔT)?

Back

ΔT = T_final - T_initial.

Front

What is the specific heat of water?

Back

The specific heat of water is 4.18 J/g°C.

Front

If 20 g of water cools from 25°C to 20°C, how much heat is lost?

Back

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

Front

What is the specific heat of copper?

Back

The specific heat of copper is 0.39 J/g°C.

Front

How do you find the specific heat capacity of a substance?

Back

Specific heat capacity (c) can be calculated using the formula c = Q / (mΔT).

Front

What is the specific heat capacity of iron if it absorbs 1086.75 J and its temperature changes from 25°C to 175°C?

Back

c = Q / (mΔT) = 1086.75 J / (15.75 g * (175°C - 25°C)) = 0.46 J/g°C.

Front

What is the energy required to raise the temperature of 1 kg of a substance by 1°C called?

Back

Specific Heat.

Front

If an unknown object has a mass of 15 g, absorbs 2050 J of heat, and has a temperature change from 50°C to 75°C, what is its specific heat?

Back

c = Q / (mΔT) = 2050 J / (15 g * (75°C - 50°C)) = 5.5 J/g°C.