text: i need help!! im doing  a science experiment on which chemical cleans a penny best..and i have some questions? one of the chemicals im using is bleech, and vinger..but does vinger go in the catagory of a chemical?? and if so do u noe if it works??/ and if it does how long will i have to keep the penny suspended in it?/ first: yes,vinegar can be considered a chemical (a diluted acetic acid).     the best way to find this out is to do some experiments on your own.  now, keep in mind that mixing chemicals can be dangerous, so don't try combinations of chemicals if you haven't taken chemistry.     i would suggest trying things you can buy at the grocery store for cleaning things (one at a time).  there are all kinds of products you may already have in your house for cleaning metals (silverware?); vinegar sounds safe enough to me but the only way to learn things is to "think outside the box".  try things you wouldn't normally think of as "chemicals", such as coffee, soft drinks (colas, etc.), orange juice, and the like.  even if you find that something doesn't work, make a note of it.  this is often how great discoveries have happened.  again, don't mix "coffee and orange juice" (or any other "chemicals")  just to see what will happen without having some idea of how they might react with one another.  gather information, but carefully.  the more you have, the better your understanding will be and you will get a better grade.