ALEX Classroom Resources

   View Standards     Standard(s): [SC2015] CHEM (9-12) 5 :

5 ) Plan and conduct investigations to demonstrate different types of simple chemical reactions based on valence electron arrangements of the reactants and determine the quantity of products and reactants.

a. Use mathematics and computational thinking to represent the ratio of reactants and products in terms of masses, molecules, and moles.

b. Use mathematics and computational thinking to support the claim that atoms, and therefore mass, are conserved during a chemical reaction.

Stoichiometry is the relationship between the relative quantities of substances taking part in a reaction or forming a compound, typically a ratio of whole integers. Chemists need stoichiometry to make the scale of chemistry more understandable. In this video, Hank is here to explain why and to teach us how to use it.