The table of numbers is the best way to record your
data accurately. However, a table can be difficult to read
and interpret. You can help people more easily see how
the volume changed by making a graph. There are many
types of graphs that you could use. A line graph is a good
choice for displaying data that change over time.
Volume Measured over Time
je
100
© 20
This graph makes it
easier to see how the
volume of gas changed
over time."
100 120 140 160 180
The line graph above shows the same information as
the data table. It shows two variables, time and volume.
Time is the independent variable. In other words, it is
the variable you could control in the experiment. The
volume of gas is the dependent variable because it
depends on the independent variable.
Line graphs clearly show changes during an experiment.
The graph shows that gas was produced slowly during the
first 20 s. From 40 s to 100 s, the gas was produced at a
rate of about 40 mL every 20 s. The reaction then slowed.
down and stopped after about 140
When did the reaction stop producing gas?