thermochemistry

the energy transferred between samples of matter because of a difference in their temperature is called

• heat

• potential energy

• temperature

chemical potential energy is

• energy stored in bonds

• kinetic energy

• thermal energy

If a chemical reaction feels hot to the touch then it is an

• exothermic reaction

• endothermic reaction

If a chemical reaction feels cool to the touch then it is an

• exothermic reaction

• endothermic reaction

The first law of thermodynamics states that

• energy is destroyed

• energy is created

• energy can be converted but not created or destroyed

The second law of thermodynamics states that

• entropy in the universe is decreasing

• entropy in the universe is increasing

• helps us in finding the temperature of the object or body.

The quantity of energy transferred as heat does not depends on:

• The nature of the material changing temperature

• The mass of the material changing temperature

• the size of the temperature change

• how fast the reaction proceeds

How many calories of heat are required to raise the temperature of 525g of aluminum from 0˚C to 50˚C? (cAl=0.21cal/g˚C)

• 5,513 cal

• 2,540 cal

• 1,123 cal

• 543 cal

What mass of water, 1.00 cal/g˚C, would have its temperature raised from 25˚C to 100˚C with the addition of 5100 cal of heat?

• 24g

• 56g

• 68g

• 86g

the amount of energy absorbed by a system as heat during a process at constant temperature is

• entropy change

• enthalpy change

• temperature