P6

Question 1

density equation

Answer 1

density = mass/volume

Question 2

unit for density

Answer 2

kg/m3

Question 3

how many grams is 1kg

Answer 3

1000g

Question 4

how many cm3 is 1m3?

Answer 4

1 x 10-6 cm3

Question 5

how many ml is 1cm3

Answer 5

1ml

Question 6

describe solids

Answer 6

• particles are arranged in rows and vibrate about a fixed position

Question 7

describe liquids

Answer 7

• particles are closely packed but not arranged in rows

Question 8

describe gases

Answer 8

• particles are in a constant random motion.
• low density- because there are large gaps between particles

Question 9

as temperature increases, how does kinetic energy of the particles change?

Answer 9

kinetic energy increases so particles move faster

Question 10

why does increasing temperature increase pressure?

Answer 10

when particles move faster, they collide with walls more often

Question 11

a gas can be ___ or ___ by pressure changes

Answer 11

compressed, expanded

Question 12

What is Boyle’s law?

Answer 12

P x V = constant
or
P1 x V1 = P2 x V2

Pressure, P, in pascals, Pa

Question 13

What is internal energy?

Answer 13

Energy stores inside a system by the particles that make up the system.

Question 14

Internal energy is the ________ of all the particles that make up the system

Answer 14

total kinetic energy and potential energy

Question 15

how does heating change the energy stored in a system, and what could this produce?

Answer 15

it increases the energy of the particles.
either raises temperature or produces change in state

Question 16

what is specific latent heat?

Answer 16

the amount of energy needed to change the state of 1kg of a substance with no temperature change

Question 17

equation linking mass, energy for a change of state and specific latent heat

Answer 17

E = mL

E, energy for a change of state, J
m, mass, kg
L, specific latent heat, J/kg

Question 18

Specific latent heat of fusion:

Answer 18

change from solid to liquid

Question 19

specific latent heat of vaporisation:

Answer 19

change of state from liquid to gas

Question 20

what shows change of state on a graph?

Answer 20

straight horizontal line

Question 21

density RP aim:

Answer 21

make and record measurements needed to determine the densities of regular and irregular solids and liquids

Question 22

What is a regular solid object?
Describe the method for calculating its density:

Answer 22

• where volume can be calculated from dimensions

1. measure mass of object with balance
2. measure side lengths with a ruler
3. calculate volume, by multiplying length sides together
4. calculate density

Question 23

What is an irregular solid object?
Describe the method for calculating its density:

Answer 23

• volume cannot be determined from dimensions

1. measure mass of object with balance
2. fill a displacement cup with water
3. carefully drop irregular object into displacement can
4. measure the volume of water that leaves the can, using a measuring cylinder. this is equal to the volume of the object
5. calculate density

Question 24

Describe the method for calculating density for a liquid:

Answer 24

1. measure mass of measuring cylinder using a balance
2. add a set volume of liquid, for example 20ml
3. measure mass of cylinder with the liquid in it using a balance
4. subtract the mass of the empty cylinder to get mass of the liquid
5. calculate density