8. Candle Burning Times. Scientific Enquiry Question. The diagram shows a candle burning in air under a bell-jar. The class were shown this demonstration, then they had to plan their own experiment.
Scientific Enquiry Question
The class were shown this demonstration, then they had to plan their own experiment.
They had to find out if there was a relationship between volume of container and burning time.
different sizes of beaker. They
lit the candle, carefully put the
beaker over the top of it and
timed how long it took for the
flame to go out. This was
repeated 3 times for each
(b) The results from one group of pupils are given below.
(i) Calculate their average burning times. Put the answers in the table
(c) Plot a graph to show group’s results.
The graph must have title that makes it clear what has been done.
The axes must be labeled to show the dependent and independent variables.
Any suspect or odd points must be made clear. (if there are any)
A best-fit line should be drawn.
Attach your graph paper to this sheet
affects the average burning time of a candle
Average burning time (s)
0 2 4 6 8 10 12 14 16 18 20
0 100 200 300 400 500 600
Beaker volume (ml)
(d) Use the graph to help you answer the next section of questions.
What burning times would you expect in the following beakers?
(i) 500 ml ________ (ii) 50 ml _______ (iii) 800 ml ________
(f) It looks as if the results were quite reliable overall and so the strength of evidence for the conclusion could be fairly strong. However, no experiment is likely to be perfect. Go back and look at the diagram and the brief method again.
Point out possible sources of error in this experiment.