In terms of the particles in an object, heat is...

• The total energy of the particles

• The average energy of the particles

• Measured in Joules

• Measured in degrees Celsius

• Measured in degrees Kelvin

In terms of particles, temperature is...

• The total energy of the particles

• The average energy of the particles

• Measured in Joules

• Measured in degrees Celsius

• Measured in degrees Kelvin

If we increase the thermal energy of an object, its particles...

• Move faster

• Move at the same speed as before

• Move slower

If we remove thermal energy from an object, its particles...

• Move faster

• Move at the same speed as before

• Move slower

If we add enough thermal energy to a solid object, its particles move so fast that...

• They break their bonds and the object melts

• They form new bonds and the object freezes

When bonds break for a solid to melt...

• energy must be provided to break the bonds

• energy is released as the bonds break

Thermal energy always passes from....

• Objects at a lower temperature to objects at a higher temperature

• Objects at a higher temperature to objects at a lower temperature

• Objects with more heat to objects with less heat

At point 'X' the liquid has reached __________ ____________

Objects 'cool down' because....

• Their particles move slower on average

• The average KE of their particles is lower

• Heat particles are removed

If particles in a gas are cooled enough...

• They move faster

• They move slowly enough to break their bonds and the gas condenses

• They move slowly enough for bonds to form and the gas condenses