12-4: Heat Calculations

What is the formula to calculate heat energy required to raise the temperature of any substance?

• q=mc∆t

• q=mc

• q= ½mv

• m=qC

How many joules of heat are needed to raise the temperature of 10 g of aluminum from 22°C to 55°C, if the specific heat of aluminum is 0.903 J/g°C?

• 298 J

• 0.003 J

• 35.2 J

• 0.374 J

The specific heat of platinum is 0.133 J/g°C. How much heat is released when a 10 g piece of platinum cools from 100°C to 50°C?

• 66.5 J

• 665 J

• 0.0266 J

• 0.665 J

What is the unit for heat?

• grams

• Celsius

• joules

• Kelvin

A pot containing 2400g of water at a temperature of 25˚C is heated on a stove until the water boils (100˚C). The specific heat of water is 4.18 J/g˚C.

Determine the heat energy needed to heat the water in the pot to boiling.

• 133.76J

• 43,062.2J

• 752,400J

• 1,003,200J

How many joules of energy are required to change 10 grams of water from 20˚C to 90˚C? The specific heat of water is 4.18 J/g˚C.

• 1476 J

• 2926 J

• 210,050 J

• 1,404,500 J

The heat content of an object does NOT depend on which of these factors?

• its mass

• its temperature

• its specific heat

• its volume

What does ΔT mean?

• peak temperature

• average temperature

• final temperature

• change in temperature

What are the units we use for mass?

• g

• m

• K

• J

C is the symbol for

• specific heat

• heat

• mass

• temperature