You can change relative amounts of recipe ingredients to make different amounts of food. In the same way, you can change relative amounts of reactants or products in balanced equations. See the text p.234-240. The note used in class can be downloaded from the unit 3 page of this site.
Homework: p.238 #5, 6; read example problem p.239-240 then answer p.240 #8, 9
Homework: p.238 #5, 6; read example problem p.239-240 then answer p.240 #8, 9