The first topic that you can work with when developing biochemistry organic chemistry science fair projects is aliphatic compounds. One example of an aliphatic compound is paraffin. Experiments with this topic can look at the solubility of aliphatic compounds and the application of these compound to chemical products.
Another topic that you can work with when developing biochemistry organic chemistry science fair projects is aromatic compounds. One example of a aromatic compound is benzene. When designing biochemistry science fair projects around this topic you can examine the molecule structure of these compounds, you can examine their current applications or you can develop new products using these compounds.
The third option that you have for free 12th science fair projects is to look at biomolecules. These are the molecules that make up living things. DNA, for example, is made up of biomolecules. This is a fertile topic if you are interested in biochemistry or organic chemistry. Some of the experiments that you can work with include experiments that examined amino acids, nutrients, carbohydrates, enzymes and other related chemical compounds.
The fourth topic that you can work with is polymers. Polymers are created by chemical reactions. This is a very interesting topic to work with, as you can create polymers that are slimy, like gak, or that are firm and airy, like polystyrene. You will need to be careful when working with polymers, especially if you are experimenting outside the box. If you aren't sure if two compounds are safe to mix together ask your teacher. Also, if you anticipate noxious fumes to develop when you create your polymer, work outside or in a well ventilated area.
The final option that you have is to explore the characteristics of organic substances. For example, you can examine the solubility of compounds, the type of bonds their structures have or the molecular structures that organic compounds have. You can also compare organic molecules to inorganic molecules. Then explain how organisms use both to survive, function and thrive.
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