Cooking and Specific Heat

The specific heat of copper is 0.39 J/g °C. What is the temperature change when 100 Joules of heat is added to 20 grams?

• 24.12°C

• 12.82°C

• 351°C

Do reactants in an endothermic reaction have a higher or lower energy than the products?

• Higher

• Lower

When a piece of aluminum foil is taken out of the oven and cools from 100° to 50°, what is the change in temperature?

• -50°

• 50°

• 0°

• 100°

Specific heat is...

• A measure of the energy needed to increase the average kinetic energy of the particles

• The transfer of energy by electromagnetic radiation

• The measure of kinetic energy of an object's particles

• The heating caused by the motion of fluid due to temperature difference

Specific heat capacity is:

• heat energy need to raise temp for 1g of substance

• heat energy absorb to raise 1g of substance to higher temp

• heat energy needed to raise temp of 1g of substance by 1C

• heat energy needed to raise temp by 1C

For a skillet, used for cooking, do you want a high or low specific heat?

• High, so that it will need more energy to heat up

• Low, so that it will change temperature quickly.

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

• Q = ½mv

• m=QC

• Q=mcΔt

• Q=mc

• 0.143 kJ

• 23 kJ

• 92 kJ

• 15 kJ

How many joules of heat are needed to raise the temperature of 10.0 g of aluminum from 22°C to 55°C, if the specific heat of aluminum is 0.90 J/g°C?

• 0.003 J/g°C

• 0.003 Joules

• 297 J/g°C

• 297 Joules

Define standard enthalpy of combustion.

• A) Heat absorbed when one mole of substance is burnt completely in excess oxygen under standard condition.

• B) Heat released when one mole of substance is burnt completely in excess oxygen.

• C) Heat released when one mole of substance is burnt completely in excess oxygen under standard condition.

• D) Heat change when one mole of substance is burnt partially in excess oxygen under standard condition.