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A word about …. Single Replacement Reactions. A + BX  AX + B Element + Compound  New Element + New Compound. Single Replacement Rxns. 2 Li(s) + 2 H 2 O(l)  2 LiOH ( aq ) + H 2 (g). Type #1:metal replaces a hydrogen in water molecule or an acid

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single replacement reactions
Single Replacement Reactions

A + BX  AX + B

Element + Compound 

New Element + New Compound

single replacement rxns
Single Replacement Rxns

2 Li(s) + 2 H2O(l)  2 LiOH(aq) + H2(g)

Type #1:metal replaces a hydrogen in water molecule or an acid

always get hydrogen Hydrogen gas

single replacement rxns1
Single Replacement Rxns

Type #2: one metal replaces another metal in a compound

Cu(s) + 2 AgNO3(aq) 

2 Ag(s) + Cu(NO3)2(aq)

single replacement reactions1
Single Replacement Reactions

Metals have different reactivities

must predict if given metal and given compound will react or not

single replacement rxns2
Single Replacement Rxns
  • Table J is an activity series
    • more reactive a metal is, the easier it loses its valence electrons
  • most active metal at top
  • least active metal at bottom
  • use Table J to determine if reaction will occur
single replacement reactions2
Single Replacement Reactions

Type #3: nonmetal replaces another nonmetal in compound

  • Nonmetal often is halogen
  • Halogens have different reactivities (Table J)
  • Most active halogen = F (top)
  • Least active halogen = I (bottom)
single replacement rxns3
Single Replacement Rxns

rule:

metal CAN replace any metal listed BELOW itself on table J

nonmetalCAN replace any nonmetallisted BELOW itself on table J

- CANNOT replace metal listed above itself on table J

use table j to predict if these reactions occur

KCl(aq) + Zn(s) <not balanced>

No

No

AlCl3(aq) + Sn(s) <not balanced>

No

Ti(NO3)2(aq) + Pb(s)

No

CaF2(aq) + I2(g)

Use Table J to predict if these reactions occur
  • K(s) + ZnCl2(aq) 
  • Fe(s) + Na3PO4(aq) 
  • Cu(s) + Mg(NO3)2(aq) 
  • Al(s) + SnCl2(aq) 
  • Ca(s) + KBr(aq) 
  • Ti(s) + Pb(NO3)2(aq) 
  • Cl2(g) + HF(aq) 
  • F2(g) + CaI2(aq) 
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