Shape the other end of the wire into a loop. This loop should be about 3-4 cm from the tube. Determine the mass of a test tube by hanging it from the loop of wire attached to the balance hook. Weigh a clean, dry test tube. Record the mass.
Students record the mass.
Add 1 gram to the mass on the balance. Reweigh the test tube and powder. Record the mass. Insert the glass tube connected to the methane gas supply carefully so that it does not touch the powder. You may want to hold it during the demonstration or clamp it to a support stand.