2. Catalyst – March 17 th 2010 1. What is the general equation for a synthesis reaction? 2. What do you think the products of the following decomposition reaction are: CaO  ? + ? HOMEWORK OUT PLEASE

3. Today’s Agenda  Catalyst  Homework Review  Chemistry Prom 2010 Day 2!  Practice and Work Time  GEE PREP tomorrow!  Exit Question

4. Today’s Objectives  SWBAT predict the products of single- replacement and double-replacement reactions.  SWBAT differentiate between single- replacement and double-replacement reactions.

5. Single and Double Replacement Reactions

6. Drama on the Dance Flo!  Key Point #1: A SINGLE-REPLACEMENT REACTION is one in which a single element replaces a similar element in a compound  A + BX  AX + B  A couple is dancing, and someone else cuts in

7. Single-Replacement in Action Example: Zn + CuCl 2  Zn Cl Cu + A + BX  AX + B Cl Zn Cu +

8. Single-Replacement Practice 1. Predict the products of the reaction between solid copper and silver (I) nitrate. Write the reactants first. Then, write the products. Ag + Cu(NO 3 ) 2 Cu + AgNO 3  Must Kriss Kross to get the correct formulas!

9. Reactivity in the mix!  Will a single-replacement reaction ALWAYS take place?  Will there ALWAYS be cut-in drama on the dance flo?  No, you have to check the reactivity series of metals and halogens

10. Reactivity in the mix!  A metal will NOT ALWAYS replace another metal in a compound  Reactivity is a substance’s ability to react with another substance  The most active metals are on the top of the list on page 288  More active metals will replace less active metals  Example: Ag (s) + Cu(NO 3 ) 2 (aq)  NO RXN!

11.  Metals near the top are most reactive and will displacing metals near the bottom. Q: Which of these will react? 1. Fe + CuSO 4  2. Ni + NaCl  3. Li + ZnCO 3  4. Al + CuCl 2  Cu + Fe 2 (SO 4 ) 3 Yes, Fe is above Cu NR (no reaction) No, Ni is below Na Zn + Li 2 CO 3 Cu + AlCl 3 Yes, Al is above Cu K Na Li Ca Mg Al Zn Fe Ni Sn Pb H Cu Hg Ag Au Yes, Li is above Zn Reactivity Series

12. Reactivity of Halogens  The same goes for halogens  More active halogens will replace less active halogens  List also on page 288  Q: Which of these will react? F 2 (g) + NaBr (aq)  I 2 (g) + KCl (aq)  F Cl Br I Yes, F is above Br NaF (aq) + Br 2 (l) NR (no reaction) No, I is below Cl

13. Example Problem 10-2 Write down the following reactants. Then, predict the products of the reactions. 1. Fe + CuSO 4  2. Br 2 + MgCl 2  3. Mg + AlCl 3  K Na Li Ca Mg Al Zn Fe Ni Sn Pb H Cu Hg Ag Au F Cl Br I

15. Swing Fever! Key Point #2: A DOUBLE- REPLACEMENT REACTION is one in which ions switch places. You must KRISS-KROSS to write ALL formulas!  AX + BY  AY + BX  Two couples are dancing and decide to switch partners!

16. Double-Replacement in Action Example: MgO + CaS AX + BY  AY + BX S O  Mg Ca + O S Mg Ca +

17. Double-Replacement Practice 1. Predict the products of the reaction between silver (I) nitrate and lithium iodide. Write the reactants first. Then, write the products. LiNO 3 + AgI AgNO 3 + LiI  Must Kriss Kross to get the correct formulas!

18. Let’s think about the positive and the negative…cations and anions AX + BY  AY + BX A and B are cations (positively charged) X and Y are anions (negatively charged) You can see the anions have switched places and are now bonded to the other cations in the reaction

19. PRACTICE! Worksheet!

20. Exit Question 1. What are the 4 types of chemical reactions we have learned about so far at Chemistry Prom? 2. Will the following reaction occur? Why or why not? Ni + AuBr 3  NiBr 2 + Au TONIGHT’S HW: FINISH WORKSHEET!