Kinetic theory

Question 1

Define specific heat capacity

Answer 1

The amount of energy needed to increase the temperature of 1kg of a substance by 1 degree celcius

Question 2

define specific latent heat

Answer 2

the amount of energy needed to change the state of 1kg of a substance with no change in temperature

Question 3

describe the motion of molecules in a gas

Answer 3

they are in constant random motion

Question 4

what factor affects the average kinetic energy of gas molecules?

Answer 4

The temperature of the substance. this is because, the higher the temperature, the higher the average kinetic energy of the molecules

Question 5

What effect does increasing temperature
have on the pressure of a gas when held
at constant volume?

Answer 5

Gas pressure will increase as the temperature increases

Question 6

Describe the force that the pressure of a

gas exerts on the walls of its container. (think of the coke can experiment)

Answer 6

The force increases as pressure increases. the can will crumple

Question 7

explain how increasing the volume of a gas results in a decrease of pressure

Answer 7

molecules become more spread out and so time between collisions increases. this reduces the rate of reaction. rate of change on momentum decreases and so force exerted on container decreases, resulting in a lower pressure