lesson 12 required practical 2: thermal insulators Flashcards
first we do what
place a smaller beaker inside a larger beakers
once placing a smaller beaker inside a larger beaker, then what
we use a kettle to boil some water
once we have used a kettle to boil some water, we do what
transfer 80cm^3 of the hot water into the small beaker
once we have transferred 80cm^3 of hot water into the small beaker, we do what
use a piece of cardboard as a lid for the larger beaker
the lid for the larger beaker must have a hole for what
a thermometer
once we have put a cardboard lid on the larger beaker we do what
place a thermometer through the hole in the cardboard lid
the bulb of the thermometer must be where
in the hot water
once placing a thermometer in our smaller beaker, we do what
record the starting temperature of the water and start a stopwatch
we need to record the temperature of the water when and for how long
every 3 minutes for 15 minutes
once recording our temperature every 3 minutes for 15 minutes, we do what
repeat the experiment using the same volume of hot water
as we repeat the experiment using the same volume of hot water we need use what
an insulating material (eg bubble wrap) to fill in the gap between the two between the two beakers
we should test a range of different insulating materials, such as what
cotton wool
polystyrene balls
if we use different insulating materials, we should do what
use the same mass of insulating material, in each case
in any experiment which variable is the once that changed
independent
in this case the independent variable is what
the type of insulating material
what is the dependant variable
the one that is measured for each change in the independent variable
in this case the dependant variable is the what
the temperature
control variables are what
the ones that we don’t allow to change
the control variables are what
the volume of water and the mass of the insulating material
we need to keep the starting temperature of the water what for each experiment
this can be hard via a
the same
can be hard using a kettle but we have to try
we can record all of our results where
on a table
from these experiments we can plot what for the different insulators
cooling curves
water will cool down slowly with the most what
effective insulating material
we can also investigate how the thickness of a material affects what
the thermal insulation
to investigate how the thickness of a material affects the thermal insulation, in this case we start with a beaker containing what
80cm^3 of hot water
to investigate how the thickness of a material affects the thermal insulation, after filling the beaker with hot water what do we do
we measure the temperature of the water every 3 minutes for 15 minutes
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
wrap two layers of newspaper around the beaker
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
repeat the experiment two more times using four layers and then 6 layers of newspapers
in this case the independent variable to investigate how the thickness of a material affects the thermal insulation is what
the number of layers of the newspaper
the dependant variable to investigate how the thickness of a material affects the thermal insulation is what
the temperature
the control variable to investigate how the thickness of a material affects the thermal insulation is what
the starting temperature of the water and the volume of water
the more layers of newspaper, the what
the slower the water cools down
why does the water cool down slower due to more layers of newspapers
as more layers is a more effective thermal insulator than fewer layers
