PAG P7.5

Question 1

what’s the independent variable?

Answer 1

type of insulation

Question 2

what’s the dependent variable?

Answer 2

temperature

Question 3

what are the control variables?

Answer 3

-amount of water
-time intervals
-starting temp of water

Question 4

what is the method?

Answer 4

1. Use the kettle to boil the water
2. Secure the insulating material around the beaker
3. Place 80ml of water into the 100ml beaker
4. Cover the beaker with the cardboard lid
5. Insert the thermometer and record the temperature
6. Record the temperature every 60 seconds for 10 minutes
7. Repeat with different insulating material

Question 5

why do you use 1 layer of insulation from each material?

Answer 5

in order to be able to compare between the different materials

Question 6

why is it possible to compare the different materials?

Answer 6

because we kept the control variables the same

Question 7

what safety precautions did you take?

Answer 7

hazard: boiling hot water
safety precaution: handle beaker with care
hazard: beaker and thermometer made of glass
safety precaution: handle with care

Question 8

name some errors that could have happened

Answer 8

-time intervals for temperature inaccurate
-beaker was not insulated all over with same material

Question 9

name some ways to improve the experiment

Answer 9

-set alarms
-use same insulating material all over