Particle Model

Question 1

what is the kinetic theory of matter made up of?

Answer 1

the kinetic theory of matter is made up of tiny particles that are constantly moving

Question 2

name the 3 states of matter

Answer 2

solid
liquid
gas

Question 3

what are changes of state?

Answer 3

changes of state are physical changes

Question 4

physical change

Answer 4

not the same as chemical reactions because they are reversible

Question 5

what if the change was chemical?

Answer 5

if the change was chemical, then it would be irreversible

Question 6

what is conservation of mass?

Answer 6

when a substance changes state, its mass is conserved (stays the same)

Question 7

what is formula for density?

Answer 7

mass divided by volume

Question 8

name 3 changes of state

Answer 8

mass is conserved
physical change
reversible

Question 9

what is an upthrust

Answer 9

Aforce that keeps an object afloat

Question 10

density of liquid

Answer 10

less dense than solid

more dense than gas

Question 11

density of solid

Answer 11

most dense state of matter

Question 12

density of gases

Answer 12

least dense state of matter

Question 13

finding mass

Answer 13

we can measure the mass of an object using a balance (scale)

Question 14

pressure

Answer 14

pressure is the force exerted per unit of area. the pressure is equal to the force divided by the area

Question 15

air pressure

Answer 15

air is lighter than water, but it still exerts pressure on the things beneath it

Question 16

what happens on planes?

Answer 16

your ear pops because of the drop in atmospheric (air) pressure

Question 17

Gases

Answer 17

all gases tend to have similar properties and behave in similar ways

Question 18

atmosphere

Answer 18

A thin layer of air round the earth. Gets less dense as altitude rises (we get higher up)

Question 19

kinetic energy in gas

Answer 19

the higher the temperature of a gas, the higher the kinetic energy stored in the gas’ particles

Question 20

speed of particles

Answer 20

as you heat a gas, you transfer more kinetic energy to the gas’ particles. this increases the speed of the particles

Question 21

changes in momentum

Answer 21

when gas particles collide with the walls of their container, their momentum changes. changes in momentum are called impulses

Question 22

momentum

Answer 22

the change in a momentum is equal to the force multiplied by time. it is also the same as impulse

Question 23

density of floating object

Answer 23

if am object floats its density must be lower than the density of the fluid

Question 24

what is gravitational potential?

Answer 24

the energy of height

Question 25

kinetic

Answer 25

energy of movement

Question 26

chemical

Answer 26

energy stored inside

Question 27

sound

Answer 27

energy of noise

Question 28

light

Answer 28

energy of light

Question 29

nuclear

Answer 29

energy in atoms

Question 30

elastic

Answer 30

energy in something that can stretch

Question 31

electrical

Answer 31

energy of flowing current (electrons)

Question 32

thermal

Answer 32

energy of heat

Question 33

name 3 main subatomic particles that make up an atom

Answer 33

protons
neutrons
electrons

Question 34

what two stores of energy are added together to calculate the internal store?

Answer 34

chemical store

kinetic store

Question 35

name three terms that are multiplied to give the change in thermal energy

Answer 35

specific heat capacity
temperature change
mass