Partics Model Of Matter

Question 1

What is always Conserved when a substance, undergoes, a change of state

Answer 1

Mass

Question 2

How does a change of state different from a chemical change?

Answer 2

In a change of state, the material can return tapping its previous properties, if the change is reversed

Question 3

What is sublimation?

Answer 3

When a solid changes into a gas without passing through a liquid state

Question 4

When water boils in an open pain why does the mass of the pan of water appear to decrease?

Answer 4

Some of the water will evaporate in turn into water vapour. This will lead the pan mean in the mass of the pain will decrease the mass of the whole system however, remains constant

Question 5

explain the process is involved with the bathroom mirror mists up

Answer 5

Hot water evaporates from to form water vapour
This water vapour lands on the cooler mirror
The vapour condenses and returns to liquid state on the mirror surface 

Question 6

What is the internal energy of a substance?

Answer 6

The energy stored by the particles
The sum of the total kinetic and potential energy is that make up the system

Question 7

How does heating effect the energy of a substance?

Answer 7

Heating transfers energy to the substance
Increase is the energy of the particles that make up the substance

Question 8

What are three factors determine the temperature change of a system

Answer 8

Mass of substance, being heated
Type of material
Energy inputted into the system

Question 9

Describe how the internal energy and temperature of a substance changes when a change of a state occurs

Answer 9

The internal energy of the substance will be increased or decreased
The temperature of the substance will remain constant

Question 10

Define specific latent heat

Answer 10

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

Question 11

What is the specific latent heat of fusion?

Answer 11

The energy required to change 1 kg of a substance from a solar state to a liquid state without a change in temperature

Question 12

What is the specific latent heat of vaporisation?

Answer 12

Energy required to change 1 kg of a substance from a liquid state of gas day without a change in temperature

Question 13

Describe the motion of molecules in a gas

Answer 13

They are constant random motion

Question 14

What factors affect the average kinetic energy of a gas molecule?

Answer 14

The temperature of the substance
The higher the temperature, the higher, the average kinetic energy of the monocle

Question 15

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

Answer 15

Pressure of the gas will increase as the temperature increases

Question 16

Why does pressure increase as temperature increases(at a constant volume)?

Answer 16

Kinetic energy of molecules increase
Collisions between molecules become more frequent
Greater rate of change of momentum
Greater force and therefore pressure

Question 17

If gas a is it low pressure, and Gas b is at high pressure, what can be said about the rate of collisions in each gas?

Answer 17

There are more collisions per second in gas, bathing in gas a

Question 18

Describe the force that the pressure of a gas exerts on the walls of its container

Answer 18

The net force acts at right angles to the container surface
The force increases as pressure increases

Question 19

Explain how increasing the volume of a gas resource in a decrease of pressure

Answer 19

Molecules become more spread out and so time between collision increases
This reduces the rate of collisions
Rate of change of momentum decreases, and so far so exerted on a container decreases, resulting in lower pressure

Question 20

What can be said about the product of pressure and volume for fix mass of gas at a constant temperature

Answer 20

It is constant

Question 21

What is the unit used for pressure?

Answer 21

Pascal (Pa)

Question 22

What increases when you do work on a gas?

Answer 22

The internal energy of the gas, this can also lead to an increase of temperature

Question 23

Why does the temperature of a inside a bike pump increase when it is pumped

Answer 23

Work is done and the gas when it is compressed
Doing work on a gas increases its internal energy, so also increases the average kinetic energy of the molecules
Temperature increases with an increase of average kinetic energy