Editing Chlorine The Bacteria Killer (section)

== Why This Works ==

Yeast is a ''Microorganism'', a tiny living creature that can't easily be seen without a microscope. Yeast is a fungus that is often used in baking, since it eats sugars and produces CO<sub>2</sub>, which makes dough rise for bread and other baked goods. In order for yeast to do this, they need to be in a wet, warm environment such as these test tubes of warm water. Since the yeast are inside these test tubes with warm water and sugar, they are able to eat the sugar and produce CO<sub>2</sub>, which fills the balloons over the tops of the test tubes.

Some of the balloons are not inflating, even though they also have the warm water and sugar. This is because they have an extra "ingredient" added: chlorine bleach. Chlorine is an element that, when mixed with water, produces hydrochloric acid, a powerful acid that is used in low concentrations as a house cleaner. This is because it can destroy microorganisms such as yeast, and make it hard for future microbes to live on the surface. ''Anti-Microbial Cleaners'' are useful in making sure surfaces are clean, and destroying micoorganisms that could make people sick. This is why it is important to wash our hands and clean tables or counters before preparing food and eating at them, so to minimize the risk for illness.