1. Balanced chemical equations show the amount of: Most important are the ratios of reactants and products in moles, or… mol-to-mol ratios Stoichiometry : calculations of quantities in chemical rxns –how much reactant is needed or –how much product is formed atoms, molecules, moles, and mass

2. Atoms

3. Molecules

4. Moles

5. Mass

6. Mass and atoms are conserved in every chemical reaction Mass & Atoms

7. Atoms Mass Molecules Moles 12 164.16 g 54 54 2 H 2 S (g) + 3 O 2 (g)  2 SO 2 (g) + 2 H 2 O (g) Interpret this equation in terms of:

8. 1.A manufacturer of tricycles has 15 wheels(W), 6 frames(F), 5 handlebars(H), 12 seats(S), and 8 pedals(P). How many tricycles can be manufactured using these parts? A.5 tricycles B.3 tricycles C.6 tricycles D.4 tricycles Quick Quiz! 3 W + F + H + 2 P + S → TRIKE

9. 2.What is conserved in the reaction shown below? H 2 (g) + Cl 2 (g)  2 HCl (g) A.only mass B.only mass and atoms C.only mass, atoms, and moles D.mass, atoms, moles, and molecules Quick Quiz.

10. 3.What is the most important information from a chemical equation? A.states of matter B.moles of products C.mole ratios of reactants & products D.masses of reactants and products Quick Quiz.