Thermodynamics Review (q=mcT and phase diagrams)

Front

What is measured by the unit Joules?

Back

Heat energy

Front

How much heat (Q) is released when a 10 g piece of lead cools from 100°C to 35°C?

Back

-83.85 J

Front

What is the boiling point of a substance if its heating curve shows a transition at 60°C?

Back

60°C

Front

Which line segment on a heating curve demonstrates vaporization occurring?

Back

D-E

Front

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

Back

Q = mcΔT

Front

What does 'm' represent in the formula Q = mcΔT?

Back

Mass of the substance in grams.

Front

What does 'c' represent in the formula Q = mcΔT?

Back

Specific heat capacity of the substance.

Front

What does 'ΔT' represent in the formula Q = mcΔT?

Back

Change in temperature (final temperature - initial temperature).

Front

If 20 g of water with a specific heat of 4.18 J/g°C cools from 25°C to 20°C, how much heat energy (Q) moves from the water to the surroundings?

Back

418 J

Front

What is the specific heat of water?

Back

4.18 J/g°C