Designing a fair test
Designing a fair test
Which flame of the
Bunsen burner is hotter?
Blue flame?
Yellow flame?
Designing a fair test
1 What is your hypothesis ?
The blue flame is hotter than the
yellow flame.
Designing a fair test
2 Based on your hypothesis, what
is your prediction ?
If the blue flame is hotter than
the yellow flame, water will reach
boiling faster .
Designing a fair test
3 You have the following apparatus.
Designing a fair test
How will you carry out the experiment ?
I will...
• heat water in a beaker
with a blue flame
until it boils,
• heat water in another beaker
with a yellow flame until it
boils.
Designing a fair test
4 What will you measure ?
I will use a...
stop-watch to measure the time for
the water in the two beakers to boil.
Designing a fair test
5 What will you do to make sure
that the test is fair ?
I will use the same Bunsen burner to
boil the water in the two beakers.
I will put equal amount of water
at the same temperature into the
two beakers.
Same gas supply
Stop timing as soon as the water boils.
Designing a fair test
6 How will you draw your conclusion ?
The flame that takes
a shorter time to boil
water is hotter .