.
  Bethan carries out an experiment with a burning candle. Bethan places a burning candle under a beaker and times how long it takes to go out.  She then repeats the experiment with different amounts of oxygen.
Her results are shown below:-
Amount of Oxygen  (cm
3
)
Time taken for candle to go out
(seconds)
10
15
30
45
60
90
100
150
150
225
200
300
 
(a)
 
draw a line graph of Bethan’s results
. Marks will be awarded for labelled axis, a good scale, a  line of best fit and a title.  (5 marks)                                                                                    
 
(b) What is the independent variable in this experiment?
_________________________________________ (1 mark)
(c) What is the dependent variable in this experiment?
_________________________________________ (1 mark)
 
 
(d) Write a conclusion for the experiment. (1 mark)
_____________________________________________________________
_____________________________________________________________