1. Quick Review List the different types of atoms and the number of each in the following substances. 3Li 2 SO 3 Li – 6, S – 3, O – 93BNO 3 B – 3, N – 3, O – 9 2B 2 Br 6 B – 4, Br – 124PbNO 3 Pb – 4, N – 4, O – 12 5NH 4 NO 3 N – 10, H – 20, O – 15(NH 4 ) 3 PH 4 N – 3, H – 16, P – 1

2. Quick Review Determine the number of hydrogen molecules (H 2 ) that would balance the following chemical equation. 4SnHO 2 + ?H 2 → 4SnH + 8H 2 O 8

3. Lesson 1.10 – Amount of Reactants and Products

4. Daily Question Why can I determine the amount of a reactants used only by knowing the amount of the product produced?

5. I can determine the amount of reactants used or products produced from a balanced chemical equation. (2a) 1. What: If we know the number of molecules of a product then we can determine how many molecules of a reactant must have been used. 4FeS + 7O 2 → 2Fe 2 O 3 + 4SO 2 A factory produces a substance using the balanced chemical reaction below. If the factory wants to produce 100 atoms of SO 2 how many molecules of oxygen must the factory add?

6. 2. Why: A chemical engineer finds ways to produce new chemicals. He or she wants the reactions to produce the most number of products possible. They must also know how much of each reactant they need. I can determine the amount of reactants used or products produced from a balanced chemical equation. (2a) 4FeS + 7O 2 → 2Fe 2 O 3 + 4SO 2 A factory produces a substance using the balanced chemical reaction below. If the factory wants to produce 100 atoms of SO 2 how many molecules of oxygen must the factory add?

7. 3. How – The Right Answer Rail Road! a. List the known information under the chemical equation. b. Place a question mark under the substance in question. I can determine the amount of reactants used or products produced from a balanced chemical equation. (2a) 4FeS + 7O 2 → 2Fe 2 O 3 + 4SO 2 A factory produces a substance using the balanced chemical reaction below. If the factory wants to produce 100 atoms of SO 2 how many molecules of oxygen must the factory add?

8. c. Setup the Rail Road i. Write the given amount and include the formula of the molecule after. ii. Draw a vertical line. ?Al + 6FeO → 2Al 2 O 3 + 6Fe I can determine the amount of reactants used or products produced from a balanced chemical equation. (2a) 4FeS + 7O 2 → 2Fe 2 O 3 + 4SO 2 A factory produces a substance using the balanced chemical reaction below. If the factory wants to produce 100 atoms of SO 2 how many molecules of oxygen must the factory add?

9. iii. Write in ratio. 1. Write coefficient of known molecule on bottom. 2. Write coefficient of unknown molecule on top. iv. Solve by multiplying across both tracks and dividing the top track by the bottom. I can determine the amount of reactants used or products produced from a balanced chemical equation. (2a) 4FeS + 7O 2 → 2Fe 2 O 3 + 4SO 2 A factory produces a substance using the balanced chemical reaction below. If the factory wants to produce 100 atoms of SO 2 how many molecules of oxygen must the factory add?

10. You should be working with us, not ahead!

11. Guided Practice 1. A chemist is performing the balanced chemical reaction below. If she wants to obtain 120 molecules of HCl, how many molecules of AsCl 3 must she use? 2AsCl 3 + 3H 2 S → As 2 S 3 + 6HCl I can determine the amount of reactants used or products produced from a balanced chemical equation. (2a)

12. 2. Aluminum chloride is a substance used in deodorant. A deodorant manufacturer wants to produce 400 molecules of AlCl 3. How many molecules of Cl 2 will be used up by the reaction? 2Al + 3Cl 2 → 2AlCl 3 Guided Practice I can determine the amount of reactants used or products produced from a balanced chemical equation. (2a)

13. Quiz 2 Label a sheet of paper: Your Name Science November 15, 2012 Quiz 2

14. I-N-D-E-P-E-N-D-E-N-T Do you know what that means?

15. Exit Ticket Show what you know!!!

16. 1. How many oxygen atoms are in 3NaOCO 3 H ?

17. 2. How many zinc (Zn) atoms are in the products? 4Zn + 8HCl → 4ZnCl 2 + 4H 2

18. 3. How many oxygen atoms are in the products? C 2 H 6 + O 2 → 2CO2 + H2O

19. 4. If a chemist wants to produce 120 molecules of ( NH 3 ), how many molecules of hydrogen are needed? N 2 + 3H 2 → 2NH 3

20. 5. A factory has 100 molecules of NaClO 3, how many molecules of oxygen could be produced using the following equation? 2NaClO 3 → 2NaCl + 3O 2