Thermochemistry

If the temperature of a sample is decreased, the particles

• slow down

• have a lower kinetic energy

• speed up

• slow down and have a lower kinetic energy

Tags

NGSS.MS-PS1-4

Which process releases the most heat when cooling down steam?

• freezing

• cooling it form 100 to 0 degrees

• condensing

A piece of copper weighing 50 grams compared to a copper piece weighing 5 grams has

• has a higher specific heat

• has the same specific heat

• has a lower specific heat

The heat of reaction is also called

• reactant energy

• enthalpy

• activation energy

• q, heat

In an endothermic reaction, the energy stored in the bonds of the reactants is

• lower than the energy of the product bonds

• greater than the energy of the product bonds

• equal to the energy of the product bonds

• higher than the energy released

What happens when a heated piece of metal is submerged in cool water?

• The temperature of the water will decrease

• The temperature of the water will increase

• The metal temperature will go up and water temperature will go down

• The water temperature will go up and the metal temperature will go down

Tags

NGSS.HS-PS3-4

The calorie is a bigger unit than the Joule

• true

• false

A potato chip has 10 Calories and is burned completely. How much heat does it give off.

• 10 calories

• 2390 Joules

• 10,000 calories

• 2.39 Joules

Which of the following are specific heat units?

• cal

• Joule

• cal / *C

• joules / *C g

A + B + heat ---> AB; Delta H, enthalpy is

• negative

• positive

• not enough information given