Heat

1. For the formula:

Q= m c ∆T

The units for specific heat are:

• g /J °C

• °C/g J

• kJ/g

• J/g°C

What would be the effect on the particles if more heat is supplied to the system?

• They would slow down

• They would stop moving

• They would speed up

• There would be no effect

If two objects have different temperatures, heat will flow from the warmer object to the cooler one UNTIL ____________

• one reaches a temperature of zero

• they both have an equal temperature

• one runs out of energy

• none of these

The total energy of all the particles in a substance is called:

• temperature

• thermal energy

• degrees

• mass

If the specific heat of water is 4.18 J/g∙°C, how much heat is required to increase the temperature of 1.2 kg of water from 23 °C to 39 °C?

• -80,256

• 80.256

• 80,256

• -80.256

The SI unit of heat and energy is the __________.

• calorie

• heat

• joule

• watt

Water molecules have the greatest kinetic energy in

________________

• Ice at 0 °C.

• Water at 373 K.

• Water at 98 °C

• Steam at 150 °C.

A metal cube at temperature of 10°C immersed in a liquid at temperature of 70°C.

What is the temperature of the metal cube when thermal equilibrium is achieved between the cube and the liquid?

• Between 10°C and 70°C

• More than 70°C

• Less than 10°C

• Same as the room temperature

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

In an exothermic process, the surroundings are gaining energy.

• true

• false