Heat & Energy Review

Front

What is the formula to calculate the change in thermal energy?

Back

Q = mc∆t

Front

Define specific heat capacity.

Back

The heat required to raise the temperature of 1 g of a substance by 1°C.

Front

What is the specific heat of water?

Back

4.18 J/g°C

Front

How much heat is required to raise the temperature of 200 g of water from 24.0°C to 100.0°C?

Back

Q = mc∆t = 200g * 4.18 J/g°C * (100°C - 24°C) = 63,600 J

Front

What is the heat of vaporization of water?

Back

2260 J/g

Front

How much heat is required to vaporize 100 g of water at 100°C?

Back

22,600 J (100 g * 2260 J/g)

Front

What does the symbol 'm' represent in the equation Q = mc∆t?

Back

Mass of the substance in grams.

Front

What does the symbol 'c' represent in the equation Q = mc∆t?

Back

Specific heat capacity of the substance.

Front

What does the symbol '∆t' represent in the equation Q = mc∆t?

Back

Change in temperature in degrees Celsius.

Front

If a metal absorbs 350.0 J of energy and its temperature changes from 25.0°C to 35.0°C, how do you calculate its specific heat?

Back

Specific heat = Q / (m * ∆t) = 350.0 J / (30.00 g * 10°C) = 1.17 J/g°C