Q=MCAT

Front

What is the formula for calculating heat energy (Q) in a substance?

Back

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

Front

What is specific heat capacity?

Back

Specific heat capacity is the amount of heat required to raise the temperature of 1 gram of a substance by 1 degree Celsius.

Front

How do you calculate the change in temperature (ΔT)?

Back

ΔT = final temperature - initial temperature.

Front

What is the specific heat capacity of water?

Back

The specific heat capacity of water is approximately 4.18 J/(g·°C).

Front

If 200 grams of water is heated from 24.0° C to 100.0° C, what is the change in temperature (ΔT)?

Back

ΔT = 100.0° C - 24.0° C = 76.0° C.

Front

How many Joules of energy are required to change 10 grams of ice at -2°C to water at 20°C?

Back

10,140 J.

Front

What is the unit of mass in the metric system?

Back

The unit of mass is grams (g).

Front

How do you calculate the heat energy (Q) lost by water when it cools down?

Back

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

Front

If 20.0 g of water cools from 25.0° C to 20.0° C, how much heat energy is released?

Back

Q = 20.0 g * 4.18 J/g°C * (20.0° C - 25.0° C) = 418 J.

Front

How many Joules of energy are required to heat 10 grams of water from 20°C to 90°C?

Back

Q = mcΔT = 10 g * 4.18 J/g°C * (90°C - 20°C) = 2800 J.