Differentiation Modifications Have students develop the experimental design on their own using the tools provided. For example, students may choose to set up a control treatment as a chamber with BTB and no ethanol. If you have a hygrometer, consider measuring water content in the air after the ethanol burns. Tips Addressing problems at this point as students try to find patterns in data will support their learning in future investigations. This is the first investigation, so it is likely to expose challenges that may come up again. Extending the Learning Students can explore conditions under which the ethanol burns for longer or shorter periods, and the relationship between how long the ethanol burns and how much mass it loses.