Patricle Model Of Matter

Question 1

What is the equation for density? + what is the unit? - PMOM

Answer 1

Density = Mass
Unit = Kg/M^2 or g/cm^2

Question 2

Describe the arrangement of particles in a solid - PMOM

Answer 2

Particles are tightly packed in a regular structure and aren’t free to move

Question 3

Describe the arrangement of particles in a liquid - PMOM

Answer 3

Particles are tightly packed together but are free to move around

Question 4

Describe the arrangement of particles in a gas - PMOM

Answer 4

Particles are spread out and move randomly

Question 5

How do you find the volume of an irregular shape? - PMOM

Answer 5

Fill a displacement can with water until it runs out of the spout. Find a container for the spout to run into. Place your object in the can. The volume of water that exits the can is the same as the volume of the object

Question 6

What is sublimation? - PMOM

Answer 6

Heating a solid with similar melting and boiling points that goes from solid > gas

Question 7

What is condensing? - PMOM

Answer 7

Cooling a gas, meaning it goes from gas > solid

Question 8

What happens when a material is heated/cooled? (Name both) - PMOM

Answer 8

Chemical bonds may form, break or weaken

The material will lose/gain thermal energy as the particles within it lose/gain speed

Question 9

What is the law of the conservation of energy? - PMOM

Answer 9

Presuming no energy is lost to the environment, any energy transferred to a material is distributed in its energy stores

Question 10

What is Specific Heat Capacity? - PMOM

Answer 10

Specific heat capacity is the amount of energy required to change 1 Kg of a substance by 1°C without a change in temperature

Question 11

What is the equation for Specific Heat Capacity?

Answer 11

Specific Heat Capacity = Change in thermal energy/Mass/Temperature change

Question 12

What is Specific Latent Heat? - PMOM

Answer 12

The amount of energy required to change the state of 1 Kg of a material without changing temperature

Question 13

What is the equation for Specific Latent Heat? - PMOM

Answer 13

Specific Latent Heat = Change in thermal energy / mass

Question 14

What is happening at the horizontal areas of a heating/cooling curve? - PMOM

Answer 14

The bonds of a substance are being broken, rather than increasing the speed of particles

Question 15

What does a longer horizontal line mean on a heating/cooling curve? - PMOM

Answer 15

The longer the line, the more energy is required to break bonds between particles

Question 16

Describe the movement of particles in a gas - PMOM

Answer 16

Gas particles move very quickly in random directions

Question 17

What is gas pressure? - PMOM

Answer 17

Collisions between particles of a gas when in a particular area

Question 18

What measures cause gas pressure to increase? - PMOM

Answer 18

By either increasing the temperature of the container or decreasing the area of the container

Question 19

Explain how both measures of increasing gas pressure work - PMOM

Answer 19

Increasing temperature supplies the particles with more kinetic energy, causing more collisions between particles
By decreasing the area of the container, more collisions occur

Question 20

What is the equation for pressure? - PMOM

Answer 20

Pressure = force/area

AREA IN METRES SQUARED

Question 21

Describe the relationship between pressure and temperature - PMOM

Answer 21

The relationship between pressure and temperature is directly proportional

Question 22

What does pV = Constant mean? (BOYLE’S LAW) - PMOM

Answer 22

When pressure increases, volume decreases (AND VICE VERSA)

Question 23

What does p1V1 = p2V2 mean? - PMOM

Answer 23

Both pressures and volumes in different containers are proportional to one another

Question 24

Why does force being applied to gas particles result in an energy transfer? - PMOM

Answer 24

By applying force through a

piston and moving the particles when decreasing volume, work is done