This unit was over stoichiometry which is a section of chemistry that involves using relationships between reactants and/or products in a chemical reaction to determine desired quantitative data. That is the literal meaning but it is just the use of reactants or products to determine quantities among them. It is fairly easy since it is mostly conversions. Last time we did conversions I did really well on it and hopefully it wont be any harder than we have seen it to be today.
Here are some links to help with it.
https://www.khanacademy.org/science/chemistry/chemical-reactions-stoichiome
http://chemwiki.ucdavis.edu/Analytical_Chemistry/Chemical_Reactions/Stoichiometry_and_Balancing_Reactions
http://www.chem4kids.com/files/react_stoichio.html
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