T3 - Particle model of matter

Question 1

Equation for density?

Answer 1

Density(kg/m^3) = Mass(kg) / volume(m^3)

Question 2

Features of particles in a solid? x3

Answer 2

-particles close together
-particles arranged in regular pattern
-vibrate but dont move

Question 3

Features of particles in a liquid? x3

Answer 3

-particles close together
-particles not arranged in regular pattern
-particles move around each other

Question 3

Features of particles in a gas? x3

Answer 3

-particles far apart
-particles not arranged in pattern
-particles move rapidly

Question 3

Why do solids have a high density?

Answer 3

particles are close together

Question 3

Why do gases have a low density?

Answer 3

particles are far apart

Question 3

What is internal energy?

Answer 3

energy stored in a system by the particles

Question 4

Internal energy is the total of what two energies?

Answer 4

-kinetic
-potential

Question 5

What is solid to gas called?

Answer 5

sublimation

Question 6

What happens to internal energy if you heat a substance?

Answer 6

Internal energy increases

Question 7

What happens to internal energy if you cool a substance?

Answer 7

Internal energy decreases

Question 8

What happens to the mass when a change of state takes places?

Answer 8

Mass is conserved

Question 9

What is evaporation?

Answer 9

when the surface of a liquid turns to gas

Question 10

What is the specific heat capacity of a substance?

Answer 10

the amount of energy required to raise the temperature of 1kg of the substance by 1 degree C

Question 11

Equation for specific heat capacity?

Answer 11

change in thermal energy(J) = mass(kg) × specific heat capacity(j/kg c) × temperature change(C)

Question 12

What is latent heat?

Answer 12

energy needed for a substance to change state

Question 13

During change of state, what changes and what doesnt?

Answer 13

Internal energy changes and temperature does not

Question 14

What is specific latent heat?

Answer 14

the amount of energy required to change the state of 1kg of the substance with no change in temperature.

Question 15

What change of state is specific latent heat of fusion?

Answer 15

solid to liquid

Question 16

What change of state is specific latent heat of vapourisation?

Answer 16

liquid to vapour

Question 17

Equation for specific latent heat?

Answer 17

energy for a change of state(J) = mass(kg) × specific latent heat(J/kg)

Question 18

particles of gas move in what motion?

Answer 18

constant random motion

Question 19

What causes pressure of a gas?

Answer 19

particles colliding with wall of container

Question 20

How can we increase pressure of gas?

Answer 20

increase temperature of gas

Question 21

How does increasing temperature of gas increase pressure?

Answer 21

increases kinetic energy of particles

Question 22

How does increasing kinetic energy of gas increase pressure? x2

Answer 22

-increases number of collisions -increases energy of each collision

Question 23

How does the force created by particle collisions act?

Answer 23

act at rights angles to wall of container

Question 24

What happens to pressure when you increase volume of container?

Answer 24

It decreases

Question 25

Why does the pressure decrease when volume of container increases?

Answer 25

particles travel further before colliding

Question 26

Correlation between pressure of gas and volume?

Answer 26

inversely proportional

Question 27

What happens to the pressure if the volume increases?

Answer 27

it decreases

Question 28

Pressure and volume equation?

Answer 28

pressure(pa) × volume(m^3) = constant

Question 29

What is work?

Answer 29

transfer of energy by a force.

Question 30

What happens when you do work on a gas?

Answer 30

internal energy and temperature of gas increase