lesson 12 required practical 2: thermal insulators

Question 1

first we do what

Answer 1

place a smaller beaker inside a larger beakers

Question 2

once placing a smaller beaker inside a larger beaker, then what

Answer 2

we use a kettle to boil some water

Question 3

once we have used a kettle to boil some water, we do what

Answer 3

transfer 80cm^3 of the hot water into the small beaker

Question 4

once we have transferred 80cm^3 of hot water into the small beaker, we do what

Answer 4

use a piece of cardboard as a lid for the larger beaker

Question 5

the lid for the larger beaker must have a hole for what

Answer 5

a thermometer

Question 6

once we have put a cardboard lid on the larger beaker we do what

Answer 6

place a thermometer through the hole in the cardboard lid

Question 7

the bulb of the thermometer must be where

Answer 7

in the hot water

Question 8

once placing a thermometer in our smaller beaker, we do what

Answer 8

record the starting temperature of the water and start a stopwatch

Question 9

we need to record the temperature of the water when and for how long

Answer 9

every 3 minutes for 15 minutes

Question 10

once recording our temperature every 3 minutes for 15 minutes, we do what

Answer 10

repeat the experiment using the same volume of hot water

Question 11

as we repeat the experiment using the same volume of hot water we need use what

Answer 11

an insulating material (eg bubble wrap) to fill in the gap between the two between the two beakers

Question 12

we should test a range of different insulating materials, such as what

Answer 12

cotton wool
polystyrene balls

Question 13

if we use different insulating materials, we should do what

Answer 13

use the same mass of insulating material, in each case

Question 14

in any experiment which variable is the once that changed

Answer 14

independent

Question 15

in this case the independent variable is what

Answer 15

the type of insulating material

Question 16

what is the dependant variable

Answer 16

the one that is measured for each change in the independent variable

Question 17

in this case the dependant variable is the what

Answer 17

the temperature

Question 18

control variables are what

Answer 18

the ones that we don’t allow to change

Question 19

the control variables are what

Answer 19

the volume of water and the mass of the insulating material

Question 20

we need to keep the starting temperature of the water what for each experiment

this can be hard via a

Answer 20

the same

can be hard using a kettle but we have to try

Question 21

we can record all of our results where

Answer 21

on a table

Question 22

from these experiments we can plot what for the different insulators

Answer 22

cooling curves

Question 23

water will cool down slowly with the most what

Answer 23

effective insulating material

Question 24

we can also investigate how the thickness of a material affects what

Answer 24

the thermal insulation

Question 25

to investigate how the thickness of a material affects the thermal insulation, in this case we start with a beaker containing what

Answer 25

80cm^3 of hot water

Question 26

to investigate how the thickness of a material affects the thermal insulation, after filling the beaker with hot water what do we do

Answer 26

we measure the temperature of the water every 3 minutes for 15 minutes

Question 27

after we have measured the temperature of the water every 3 minutes for 15 minutes to investigate how the thickness of a material affects the thermal insulation we then do what

Answer 27

wrap two layers of newspaper around the beaker

Question 28

after we have wrapped two layers of newspaper around the beaker to investigate how the thickness of a material affects the thermal insulation we then do what

Answer 28

repeat the experiment two more times using four layers and then 6 layers of newspapers

Question 29

in this case the independent variable to investigate how the thickness of a material affects the thermal insulation is what

Answer 29

the number of layers of the newspaper

Question 30

the dependant variable to investigate how the thickness of a material affects the thermal insulation is what

Answer 30

the temperature

Question 31

the control variable to investigate how the thickness of a material affects the thermal insulation is what

Answer 31

the starting temperature of the water and the volume of water

Question 32

the more layers of newspaper, the what

Answer 32

the slower the water cools down

Question 33

why does the water cool down slower due to more layers of newspapers

Answer 33

as more layers is a more effective thermal insulator than fewer layers