Partucle Model Of Matter- Paper 1

Question 1

What does density measure?
What does density depend on and an example? 2

Answer 1

Density= ‘compactness’ substance. How much space If takes up.
.depends on what it’s made of and how its arranged.
-compressed particles move closer together, denser

Question 2

SOLIDS? 5

Answer 2

-strong forces of attraction hold particles close together
-fixed, regular arrangement.
-Particles don’t much energy,
-only vibrate fixed positions.
-density highest particles.

Question 3

What are the 5 properties of LIQUIDS?

Answer 3

1-weaker forces attraction particles close together, can past each other,
2-irregular arrangements.
3-more energy than solid.
4-random directions low speeds.
5-less dense solids.

Question 4

What are the 4 properties of GASES?

Answer 4

1-no forces of attraction particles,
2-most energy, free to move,
3-travel in random directions high speeds.
4-low densities.

Question 5

How To find the density of a solid object?
How to find the density of an irregular object?

Answer 5

1)balance measure mass by measuring its length, width and height mutiply

2)irregular solid, volume by submerging it in a eureka can filled with water. water displaced by the object will be transferred measuring cylinder.
3)Record the volume of water measuring cylinder= volume of the object. + formula

Question 6

How To find the density of a liquid?

Answer 6

1) measuring cylinder on a balance and zero the balance.
2) Pour 10 ml of the liquid into the measuring record liquid’s mass.
3) Pour another 10 ml into the measuring cylinder, repeating the process until cylinder is full and recording total volume and mass each time.
4) For each measurement, use the formula to find the density
5) average of your calculated densities. Density(kg/m^3)= mass (kg)/volume (m^3)

Question 7

What is Internal Energy? 2

Answer 7

.Energy Stored by the Particles Making Up a System.
-internal energy of a system total energy particles stores.

Question 8

When does a change in state occur?

Answer 8

=heated enough - particles will have enough energy kinetic energy stores break bonds holding them together.
-cooling. particles lose energy and form bonds.

Question 9

A Change of State Conserves Mass?

Answer 9

.change of state is a physical change, number of particles doesn’t change - arranged differently.=mass is conserved

Question 10

What does a Change of State Require?
when a substance condenses or freezes?
what is a flat stop on the graph?

Answer 10

1)energy increasing the internal energy, energy’s used for breaking bonds
2)substance condensing, freezing=bonds formed between particles=internal energy decreases,

.flat spots on the heating graph where energy is being transferred by heating
.show this energy transfer= =temp doesn’t go down until all the substance turned to liquid (condensing) or a solid (freezing)

Question 11

What is Specific Latent Heat and what are the two different types? what effect specific latent heat?

Answer 11

=Energy Needed for a 1 kg Mass to Change State without changing its temperature.

1) specific latent heat energy released by change state. different materials, different states.
2) specific latent heat changing between a solid and a liquid=specific latent heat of fusion.
changing between a liquid and a gas specific latent heat vaporisation.

Question 12

Heating graph specific latent heat?

Answer 12

Question 13

Condensing graph specific latent heat?

Answer 13

Question 14

What is Energy in Kinetic Stores is Related to? 2

Answer 14

1)tempearture=transfer energy into kinetic energy stores particles.
2)higher temperature, higher average energy.= higher speed

Question 15

Relationship of Colliding Gas Particles Create Pressure and why?
How does the temperature effect this? Temperature increases and constant
What is the relationship between pressure and volume?

Answer 15

1-gas particles move high speeds=bang into. Collide=exert force.
2-Faster particles frequent collisions=increase in net force, and gas pressure.Increasing

1-increases temperature=increase speed, and pressure, volume constant
2-temperature constant=increasing volume of a gas=particles get more spread out, gas pressure decreases.

.Pressure + volume inversely proportional - volume goes up, pressure goes down

Question 16

How does a Change in Pressure Cause a Change in Volume? 3

Answer 16

1)pressure gas force right angles surface container.
2) force outside container due pressure the gas around it
3) change pressures cause=container compress or expand=overall force.

Question 17

Transferring energy on a Gas Can Increase its Temperature?

Answer 17

1)transfer energy by applying a force, gas increases its internal energy, increase its temperature.
2)gas mechanically, e.g. with a bike pump. gas applies pressure to the plunger of the pump, exerts a force on it.
3) This transfers energy to the kinetic energy stores of the gas particles, increasing the temperature. Pressure(PA)xVoume (m^3)= constant

Question 18

How do eureka cans work? 3

Answer 18

1.Water drains=water level below starting sprout.
2.Water displaced= measuring cylinder, correct volume.
3.Wait until the spout has stopped

Question 19

How to measure volume of liquid?

Answer 19

Empty measuring clyindar and balance reset and pour into the container