Silver reacts to sulfur in the air. Whenever you see silver that has become blackened, it shows that a coat of sulfide has settled on it. To polish the silver, it is necessary to reverse the chemical reaction. Line a pan large enough to hold your tarnished silver with aluminum foil, then put the silver in it. Boil enough water to submerge the silver in the pan. Mix the hot water with baking soda -- 1/2 cup soda for each half-gallon of water you use. Pour the mixture into the pan. The sulfur particles in the pan will travel to the aluminum foil, forming aluminum sulfide, and your silver will be clean.
You will need eggs, a sewing needle and aluminum foil to make stink bombs. Poke a hole in each egg's shell, then wrap the egg in aluminum foil. Place the wrapped eggs outside in direct sunlight for a week. Then drop the eggs to unleash that nasty stink bomb smell, which is from hydrogen sulfide. Make sure you inform your students that making stink bombs can be a dangerous hobby; prolonged exposure to hydrogen sulfide can be toxic.
Sulfur can serve as a dehydrating agent. This experiment requires lab safety goggles, 3 grams of blue hydrated copper sulfate and 2 cubic centimeters (a little more than 1/3 tsp.) of concentrated sulfuric acid. Place the blue hydrated copper sulfate into a laboratory watch glass. Add the concentrated sulfuric acid. Make sure you exercise caution when using these corrosive elements, and do not allow your students to touch them. Within a few minutes, you will see the hydrated copper sulfate change from a shade of blue to pure white. This is because the water has been removed from the copper sulfate crystals by the sulfuric acid, producing heat in exchange. Adding water can reverse the change, though this should be done carefully.
Place 50 grams of sucrose into a beaker. Using distilled water, dampen the sucrose lightly. Stir up the mixture. Clamp the beaker in a fume cabinet. Add 20 cubic centimeters (about 4 tsp.) of concentrated sulfuric acid to the mixture. Stir it up. The sugar should turn yellow, then brown and finally black. A thin black "snake" will then start to grow out of the beaker, emitting sulfur dioxide in the process.