CH4

Question 1

Definition of Temperature, T

Answer 1

Measure of the degree of hotness of an object

Question 2

Definition of Heat

Answer 2

Thermal energy that can be transferred from one object to
another

Question 3

Definition of Thermal Equilibrium

Answer 3

Net heat transfer between two objects becomes zero

Question 4

How 2 objects achieve thermal equilibrium through thermal contact (4m)

Answer 4

• When in Thermal Contact, rate of heat transfer from hot object to cold object is higher than rate of heat transfer from cold object to hot object
• Temperature of hot object will drop while temperature of cold object will rise until both object have the same temperature
• Net heat transfer between 2 objects becomes zero
• Both objects are in a state of Thermal Equilibrium

Question 5

Definition of Heat capacity, C

Answer 5

Heat energy required by an object to increase its temperature by 1 degree celcius

Question 6

Definition of Specific Heat capacity, C

Answer 6

Heat energy needed by 1kg mass of substance to increase the temperature by 1 degree celcius

Question 7

Definition of Latent Heat

Answer 7

Heat energy absorbed during melting and boiling with no change in temperature

Question 8

Definition of Specific Latent Heat

Answer 8

Heat energy absorbed or released by 1kg mass during a change of phase without change in temperature

Question 9

Definition of Specific Latent Heat of Vaporisation

Answer 9

Heat energy absorbed during boiling or released during condensation by 1kg of the substance

Question 10

Definition of Specific Latent Heat of Fusion

Answer 10

Heat Energy absorbed during melting or released during freezing by 1kg of a substance

Question 11

Purpose of heat energy absorbed without change in temperature

Answer 11

weaken or break bonds between molecules

Question 12

Purpose of heat energy released without change in temperature

Answer 12

strengthen or form bond between molecules

Question 13

Purpose of heat energy absorbed or release with change in temperature

Answer 13

increase/decrease kinetic energy of molecules

Question 14

General Formula of Gas

Answer 14

PV/T1=PV/T2

Question 15

Boyle’s law

Answer 15

The pressure is inversely proportional to volume of a fixed mass of gas with constant temperature

Question 16

Definition of gas pressure

Answer 16

Force per unit area exerted on the wall of the container

Question 17

Charles’ law

Answer 17

Volume is directly proportional to the absolute temperature of a fixed mass of gas at constant pressure

Question 17

Gay-Lussac’s Law

Answer 17

Pressure is directly proportional to the absolute temperature of a fixed mass of gas at constant volume

Question 18

Explain the relationship between volume of gas and gas pressure

Answer 18

• Volume of gas decreases
• Same number of molecules move in smaller space
• number of molecules per unit volume increases
• rate of collision between gas molecules and wall of container increases.
• force per unit area exerted on container wall increase.
• Gas pressure increase

Question 19

Explain relationship between volume and absolute temperature

Answer 19

• Temperature of gas increases
• average kinetic energy of gas molecules increases
• molecules moves with higher velocity
• volume of gas increases at constant gas pressure

Question 20

Explain relationship between gas pressure and absolute temperature

Answer 20

• temperature of gas increases
• average kinetic energy of gas molecules increases
• molecules of gas move with higher velocity
• rate of collision between gas molecule and wall of container increases
• force per unit area exerted on container wall increase
• gas pressure increase

Question 21

Condition of gas molecules at absolute zero

Answer 21

• gas molecules no longer move
• dont collide with wall of container
• zero gas pressure