7.3 Particles Heating And Cooling

Thermal _____ occurs when a solid is _____.

• expansion, cooled

• expansion, heated

• contraction, cooled

• contraction, heated

During heating of solids, particles _____ kinetic energy and vibrate ____ vigorously about their fixed positions.

• gain, less

• gain, more

• lose, less

• lose, more

During cooling of solids, particles _____ kinetic energy and vibrate ____ vigorously about their fixed positions.

• gain, less

• gain, more

• lose, less

• lose, more

Solids _______ because the ________________.

• expands during heating, particles expand

• expands during heating, distance between particles increase

• contracts during cooling, particles contract

• contracts during cooling, distance between particles decrease

Using the law of conservation of mass, during thermal expansion or cooling, the

• number of particles does not change

• number of particles changes

• size of particle does not change

• size of particles changes

Melting is the process

• a liquid changes into a solid and its temperature decreases

• a solid changes into a liquid and its temperature increases

• a liquid changes into a solid and its temperature remains the same

• a solid changes into a liquid and its temperature remains the same

Boiling is the process

• a gas changes into a liquid and its temperature decreases

• a liquid changes into a gas and its temperature increases

• a gas changes into a liquid and its temperature remains the same

• a liquid changes into a gas and its temperature remains the same

What is happening in the sloping parts of the heating curve?

• increase in temperature

• increase in kinetic energy

• no change in state

• increase in volume

• increase in energy used to weaken bonds

What is happening in the flat (horizontal) parts of the heating curve?

• no change in temperature

• increase in kinetic energy

• change in state

• increase in volume

• increase in energy used to weaken bonds

What is happening in the sloping parts of the cooling curve?

• decrease in temperature

• decrease in kinetic energy

• no change in state

• decrease in volume

• decrease in energy used to form bonds