3-Particle Model Of Matter

Question 1

What is the equation for density

Answer 1

Density (kg/m3) = mass(kg) / volume (m3)

p=m/v

Question 2

What is the arrangement of particles in solids

Answer 2

Fixed, regular formation, high density.

Strong forces hold them together

Question 3

Characteristics of solids in terms of energy and movement

Answer 3

Particles don’t have much energy so they only vibrate in fixed positions

Question 4

How are the particles arranged in liquids

Answer 4

Close together but can move past each other and form irregular arrangements
Generally less dense than solids.
Weaker forces of attraction between particles

Question 5

Characteristics of liquids in terms of energy and movement

Answer 5

More energy than solids,

Move in random directions at low speeds

Question 6

How r the particles arranged on gases

Answer 6

Particles r far apart and have almost no forces of attraction between them.
Low density

Question 7

Characteristics of gases in terms of energy and movement

Answer 7

More energy than liquids and solids,

Move at high speeds in random directions

Question 8

For measuring the volume of an irregular solid, what is the object placed into

Answer 8

Submerged in a eureka can filled with water

Question 9

What does heating a system do to the particles

Answer 9

Transfers energy to the particles, increasing the internal energy

Question 10

When does a change in state occur

Answer 10

When the substance is heated enough and the particles have enough energy to break their bonds. Or if it gets cool enough to lose energy and form bonds

Question 11

What is the energy needed to change a state of a substance called

Answer 11

Latent heat

Question 12

What is specific latent heat of a substance

Answer 12

The amount of energy needed to change 1kg of the substance from one state to another without changing its temperature

Question 13

What is the equation for energy linking to specific latent heat

Answer 13

Energy (J) = Mass (kg) x Specific latent heat (J/kg)

E=mL

Question 14

What happens when gas particles collide

Answer 14

They exert a force (pressure) on it

Question 15

What is the outward gas pressure in a sealed container

Answer 15

The total force exerted by all of the particles in the gas on a unit area of the container walls

Question 16

What does increasing temperature do to gas particles

Answer 16

Increases the speed of particles so there r more frequent collisions- increased pressure

Question 17

What is the relationship between pressure and volume for gas of fixed mass and constant temperature

Answer 17

Pressure(Pa) x Volume(m*3) = constant

pV = constant

Question 18

Why would a helium balloon expand as it rises

Answer 18

The atmospheric pressure decreases with height so the ballon has more pressure so it expands until the pressure inside drops to the same as the atmospheric pressure

Question 19

How does using a bike pump increase the gas’s temperature

Answer 19

Work has to be done to push down the plunger in the pump, this transfers energy to the kinetic energy stores which increases the temperature