Remove the other test-tube. Prepare a table, such as the one shown below, for data and information to be gathered. Do not drop it in the water in the test-tube. Hydrogen explodes when ignited. Do not drop it in the water in the test-tube.
Oxygen supports combustion.
In all this, the position of the rubber band should not be disturbed. To measure the volume of each gas, empty the water or put in more water up to the level of the rubber band in each test tube. Measure the amount of water using the graduated cylinder. Put the numbers in the table. 3 Enter the mass numbers in the table and find the mass ratio.