Question

how will u detemine the propotion of oxygen in air

Answer 1

Answer:

Place some wet iron wool in the bottom of a test tube.

Invert the test tube in a beaker containing water.

Measure the height of the column of air in the test tube.

Leave the test tube for one week.

Measure the new height of the column of air.

Answer 2

Explanation:

1) Place some wet iron wool in the bottom of test tube. 2) Invert the test tube in a beaker containing water. 3) Measure the height of the column of air in the test tube. 4) Leave the test tube for one week. 5) Measure the new height of the column of air It may help you