When you pour a solution of hydrogen peroxide, , over a cut, an enzyme in your blood decomposes it to produce oxygen gas, , as evidenced by the bubbling that takes place. It is this oxygen at high...

When you pour a solution of hydrogen peroxide,
, over a cut, an enzyme in your blood decomposes it to produce oxygen gas,
, as evidenced by the bubbling that takes place. It is this oxygen at high concentrations at the site of the injury that kills off microorganisms. A similar enzyme is found in baker’s yeast. Wear safety glasses and remove all combustibles, such as paper towels, from a clear countertop area. Pour a small packet of baker’s yeast into a tall glass. Add a couple capfuls of
hydrogen peroxide and watch oxygen bubbles form. Test for the presence of oxygen by holding a lighted match with tweezers and putting the flame near the bubbles. Look for the flame to glow more brightly as the escaping oxygen passes over it. Describe oxygen’s physical and chemical properties.