Heat and Temperature Concepts

What is the definition of temperature according to the notes?

• The total amount of energy in a substance

• A measure of the average kinetic energy of the particles in a substance

• The force that particles exert on the walls of a container

• A measure of the amount of matter in an object

What is the definition of heat according to the notes?

• The total number of particles in an object

• A measure of the average kinetic energy of particles

• The transfer of thermal energy from a warmer object to a cooler one

• The ability of an object to conduct electricity

In the diagram, when an ice cube is placed in hot cocoa, which process is endothermic?

• The cocoa cooling down

• The ice cube melting

• The cocoa releasing heat

• The mug getting warm

In the diagram, when an ice cube is placed in hot cocoa, which process is exothermic?

• The hot cocoa cooling down (releasing heat) is exothermic.

• The ice cube melting is exothermic.

• The ice cube absorbing heat is exothermic.

• The hot cocoa absorbing heat is exothermic.

What is the formula for heat transfer (Q) as given in the notes?

• Q = m · c · ΔT

• Q = m · ΔT / c

• Q = c · ΔT / m

• Q = m + c + ΔT

What does each variable in the formula Q = m · c · ΔT represent?

• m = mass, c = specific heat, ΔT = change in temperature

• m = momentum, c = speed of light, ΔT = change in time

• m = mass, c = capacitance, ΔT = change in thickness

• m = meter, c = coulomb, ΔT = change in torque

What is the unit of heat (Q) according to the notes?

• Joules (J)

• Watts (W)

• Kelvin (K)

• Coulombs (C)

Fill in the blank: ________ is the transfer of heat through direct contact between surfaces. Example: bread in a frying pan.

• Conduction

• Radiation

• Evaporation

• Convection

Fill in the blank: ________ is the transfer of heat via air or liquid. Example: heating system in a room.

• Convection

• Conduction

• Radiation

• Insulation

Fill in the blank: ________ is the transfer of heat via electromagnetic waves. Example: sun, microwave.

• Radiation

• Conduction

• Convection

• Insulation