There is a good website to view Glycolysis and what happens in each stage. Click on the website below. Once you are there, review the enzymatic steps in converting Glucose to Pyruvate (Pyruvic acid). Copy down the changes from Glucose to the final product of pyruvate. Write the enzyme name responsible for each change in between the chemical formulas. The small window shows an animated view of what happens to the molecule
http://wsrv.clas.virginia.edu/~rjh9u/glycol.html