This is a chemistry, self-extracting file for level 4-9 teachers. After extraction, 10 skeletal, molecular-model files are available. Each file can be opened in the freeware ChemSketch 2015 program. Both spacefill and ball-&-stick rotatable models can be viewed. ChemSketch is the simplest approach to creating molecular models that can be rotated (with the aid of a mouse).
Search Wikipedia for articles about individual carboxylic acids. Acetic acid is the main component of vinegar, which is used as a preservative for vegetables. Think pickles. The more carbon atoms, the less soluble the alcohol is in water. These acids are used in esterification reactions to produce fruit aromas.