Chemistry 3/17/14 “Life isn’t a matter of milestones, but of moments.” –Rose Kennedy DO NOW: 1. In your notes: balance the following equation: __ Na + __ H 2 O  __ NaOH + __ H 2 AGENDA: SWBAT identify mole ratios in a chemical equation by completing a worksheet ANNOUNCEMENT: No Science Club this week. We will meet next week to prepare for our dissection!

__ Na + __ H 2 O  __ NaOH + __ H 2 reactantsproducts Na H O

__ Na + __ H 2 O  __ NaOH + __ H molecules of Nareacts with 2 molecules of H 2 Oto yield 2 molecules of NaOHand 1 molecule of H 2

Mole Ratios Coefficients: tell us the MOLE RATIOS used or produced in a chemical reaction

__ H 2 + __ O 2  __ H 2 O 22 2 moles of H 2 reacts with 1 mole of O 2 to yield 2 moles of H 2 O

Part 1: Balancing 1.___ N 2 + ___ H 2  ___ NH 3 2.___ CH 4 + ___ O 2  ___ CO 2 + ___ H 2 O 3.___ Ag 2 O  ___ Ag + ___ O 2 4.___ Pb(OH) 2 + ___ HCl  ___ H 2 O + ___PbCl

Mole Ratios Mole Ratio: – Compares the moles of reactants and products in a chemical equation. – Can be used as conversion factor.

__ H 2 + __ O 2  __ H 2 O 22

22

22

S O 2  8 SO 3

4 P + 5 O 2  2 P 2 O 5

Using Mole Ratios We can use mole ratios in factor label problems the same way we used molar mass and Avagadro’s number.