5.3_single_and_double_replacement_reactions by tangshuming

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									 Catalyst – March 3+22, 2013
 SCRAPBOOK PAGE 2 HW OUT!
Monday Mystery Element!
1. Named after a Greek
   word meaning “bearer
   of light”
2. Discovered by boiling
   down urine
3. 2 forms: red

   (reactive) and white
 Catalyst – March 3+22, 2013
Monday Mystery Element!
1. Named after a Greek
   word meaning “bearer
   of light”
2. Discovered by boiling
   down urine
3. 2 forms: red

   (reactive) and white
mystery element…
   Phosphorus
• White phosphorus combusts in air
• Chemiluminescence
• 20% of the body is Ca3(PO4)2
• Similar to Nitrogen
Today’s Agenda
 Catalyst
 Decomposition!

 Chemistry Prom 2013 Day 3:
  Replacement Reactions!
 Practice and Work Time

 Exit Question

      WE BE BURNING TOMORROW!
        HW: SCRAPBOOK PAGE 3
Today’s Objectives

 SWBAT describe and differentiate
  between single-replacement and
  double-replacement reactions.
 SWBAT predict the products of single-

  replacement and double-replacement
  reactions.
        Chemistry Prom Events
 Interpret and write chemical equations
 Learn 5 types of chemical reactions
 Dancing (Chemistry Hood style!)
 Crown a Chemistry Prom King and Queen
  from each class
 Remember Chemistry Prom with a Scrapbook
  and use it to take a Quiz on Wednesday,
  March 27th!
    Chemistry Prom King and Queen
    Eligibility Requirements
 No unexcused absences
 Must complete all homework and
  classwork
 Must dance at least once

 Cannot abuse electronic devices or

  sleep in class
    What You Missed Last Week
 Definition of chemical reaction
 How to write word and skeleton
  equations with phase notations
 Dancing…fo sho!

 Definition of SYNTHESIS/COMBINATION
  and DECOMPOSITION reactions
 Finding your chemical date on the dance
  floor
I don’t think this is working out…

Key Point #2: A DECOMPOSITION
 REACTION is one in which _one_
 __substance__ breaks down into
 __multiple__ __substances__, usually
 with the help of some kind of heat or
 energy.
  General   Equation: AB  A + B
  A couple at the Chemistry Prom decides to
   break up
  Ammonium Dichromate
(NH4)2Cr2O7 (s) → Cr2O3 (s) + N2 (g) + 4 H2O (g)
     I don’t think this is working out…

           Decomposition reaction – one substance breaks
            into multiple substances
            A   couple decides…well it is time to break up
           AB  A + B
                       I want to see                    Satisfaction!
I don’t think
 this is right         other people
                                       Satisfaction!
   for us…
    Practice

   Show the decomposition of water after electricity has
    passed through it.
     What    are the reactants?
       Water! H2O
                                  DIATOMIC ALERT!
     What are the products?
       It’s a decomposition reaction, so we know the elements in
        water are going to break apart
       The question will specify if any compounds are formed



        H2O  H2+ O 2
                 +O
Practice

1.   With Ms. Stroh:
     Write the chemical equation for
     the decomposition of Na2S.
2.   On your own:
     Write the chemical equation for
     the decomposition of VF3.
More Practice!

    Which reactions are DECOMPOSITION reactions?
A.   C + O2  CO2
B.   CaO + H2O  Ca(OH)2
C.   H2O  H2 + O2          C, D and F
D.   H2SO4 H2 + S + 2O2
E.   Fe + CuSO4  FeSO4 + Cu
F.   K3PO4  K3P + 2O2
LET’S GET ON THE DANCE FLOOR!

 Find your date!
 Do so by finding the person that matches
  your part of a chemical equation
     If you have reactant(s), look for products(s)
     If you have product(s), look for reactant(s)
     Use arrows to help you figure out who you
      match up with
Review!

1. Identify the following reactions as
   synthesis or decomposition:
   HNO3  H2 + N2 + O2
   AB + C  ACB
2. Write the chemical equation for the
   decomposition of solid magnesium
   oxide.
  Single and Double
Replacement Reactions
Chemical Reactions

    There are 5 types of chemical hook-
     ups (reactions) at the prom this year.
    1.   Synthesis
    2.   Decomposition
    3.   Single-Replacement
    4.   Double-Replacement
    5.   Combustion
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
 General Equation: A + BX  AX + B

   A couple is dancing, and someone else cuts in
                  HOMEWRECKER!
Single-Replacement in Action

           Example: Zn + CuCl2

      Cu      +   Zn           Zn      + Cu
 Cl        Cl              Cl        Cl



            A + BX  AX + B
     Single-Replacement Practice
1.    Predict the products of the reaction between solid
      calcium and aqueous silver (I) nitrate.
        Write the reactants first.
        Then, write the products.


Ca + AgNO3                          Ag + Ca(NO3)2
                                      Must Kriss Kross to
                                       get the correct
                                          formulas!
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
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 361 (regular Chemistry book)
 More active metals will replace less active metals

     Example:   Ag (s) + Ca(NO3)2 (aq)  NO RXN!
                                                  K
    Reactivity Series                             Na
                                    No, Ni is     Li
                                    below is
                                           Na     Ca

                                   Yes, Li
 Metals near the top are most reactive and will   Mg
displacing metals near the bottom. above Zn       Al
                                                  Zn
                            Yes, Al is
Q: Which of these will react?                     Fe
                            above Cu              Ni
    1.   Fe + CuSO4  Cu + Fe2(SO4)3              Sn
                                                  Pb
    2.   Ni + NaCl   NR (no reaction) is
                              Yes, Fe
                                                  H
    3.   Li + ZnCO3  Zn + Li2CO3 Cu
                               above              Cu
    4.   Al + CuCl2  Cu + AlCl3                  Hg
                                                  Ag
                                                  Au
    Reactivity of Halogens
                                                           F

   The same goes for halogens
                                     Yes, F is
   More active halogens will replace less active halogens
                                    above Br               Cl
   Most active halogen = F
   Q: Which of these will react?       No, I is
                                       below Cl
                                                          Br
    F2 (g) + NaBr (aq)       NaF (aq) + Br2 (l)

    I2 (g) + KCl (aq)        NR (no reaction)             I
                                            K
Example Problems                            Na
                                            Li
                                            Ca
Write down the following reactants.    F    Mg
   Then, predict the products of the        Al
   reactions.                               Zn
                                       Cl   Fe
1.   Fe + CuSO4                            Ni
2.   Br2 + MgCl2                      Br
                                            Sn
                                            Pb
3.   Mg + AlCl3                            H
                                       I    Cu
                                            Hg
                                            Ag
                                            Au
Swing Fever!

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

      Example: MgO + CaS

 Mg       Ca       Mg         Ca
      +                  +
  O       S          S         O



      AX + BY  AY + BX
     Double-Replacement Practice
1.    Predict the products of the reaction between silver
      (I) nitrate and lithium phosphide.
        Write the reactants first.
        Then, write the products.


AgNO3 + Li3P  LiNO3 + AgI
                                     Must Kriss Kross to
                                      get the correct
                                         formulas!
Classwork

 Complete the worksheet
 Turn into folder when done

 Then, work on replacement

  dancing skits
    We  all want performers before
    class ends!!!!!
Classwork Answers
1.   DR   8.  K + ZnCl2  Zn + KCl
2.   SR   Potassium and zinc (II) chloride react to
3.   SR   produce zinc and potassium chloride.
4.   DR   8.  Cl2 + HF  NO REACTION
5.   SR   Elemental chlorine and hydrogen fluoride
6.   DR   do not react.
7.   DR   8.  Na + FePO4  Fe and Na3PO4
          Sodium metal and irone (III) phosphate
          yield iron metal and sodium phosphate.
Classwork Answers
11.   BaCl2 (aq) + K2CO3 (aq)  BaCO3 (s) + KCl (aq)
12.   Na3PO4 (aq) + Pb(NO3)2 (aq)  Pb3(PO4)2 (s) +
      NaNO3 (aq)
13.   Answers will vary.
14.   a. Cl2 + NaBr  NO REACTION
15.   NH3  N2 + H2
16.   Na + O2  Na2O
17.   Mg2S + HOH  Mg(OH)2 + K2S
HW Part THREE
   Create Page 3 of your Chemistry Prom Scrapbook
   BE CREATIVE!!!!
   It should include ALL of the following:
     Definitionand general equation for single-replacement
      and double-replacement reactions
     One reaction story for single-replacement

     One reaction story for double-replacement

     One picture for single-replacement

     One picture for double-replacement
                                              K
     Exit Question                            Na
                                              Li
1.   What are the 4 types of chemical         Ca
                                              Mg
     reactions we have learned about so far   Al
     at Chemistry Prom?                       Zn
2.   Will the following reaction occur? Why   Fe
     or why not?                              Ni
           Ni + AuBr3  NiBr2 + Au            Sn
                                              Pb
           HW: FINISH WORKSHEET               H
                                              Cu
                                              Hg
                                              Ag
                                              Au

								
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