Changes of State

Question 1

explain how chemical changes differ from physical changes

Answer 1

the material recovers its original properties if the change is reserved - this does not happen in a chemical change

Question 2

describe the particle motion is gases

Answer 2

• the temperature of the gas is related to the average kinetic energy of the particles
• if the temperature of the gas is increased, the particles will move faster
• faster moving particles will exert a greater force on the walls of the container
• this will either cause the container to expand or increase the pressure of the gas

Question 3

explain the relation between temperature of a gas and its pressure at constant volume

Answer 3

gas pressure is directly related to its temperature if the volume remains constant