CHM 103 Lecture Notes - Lecture 11: Spectator Ion, Salt Metathesis Reaction, Chemical Equation

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27 Sep 2016

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A reaction occurs when any of the following are formed as new products (they were not already on the reactant side of the equation) Precipitation (both reactants ionic salts, neither is an acid) Molecular equation: znso4(aq) + na2c2o4(aq) znc2o4(s) + na2so4(aq) Ionize the reactants and products that are strong electrolytes: write the complete chemical equation showing reactants and products. 3: cancel the spectator ions (the identical ions, conserve atoms and charge and make sure the equation is balanced. Reactions with acids: metal hydroxide + acid metal salt of acid + h2o (acid-base reaction) Molecular equation: koh(aq) + hclo4(aq) kclo4(aq) + h2o(l) Net ionic equation: oh- + h+ h2o(l: metal oxide + acid metal salt of acid + h2o. Molecular equation: mno(s) + 2hno3(aq) mn(no3) 2(aq) + h2o(l) Net ionic equation: mno(s) + 2h+ mn2+ + h2o(l) Remember: weak acids do not dissociate: metal carbonate + acid metal salt of acid + h2o (l) + co2 (g)

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A. Write a net ionic equation for all chemical reactions below.(Hint: it is possible for the net ionic equation to be the same asthe molecular equation. A complex ion that is in solution ismolecular in nature because units are coordinate covalently bondedtogether.)

1. Cu (s) + 4HNO3 (aq) --> Cu(NO3)2 (aq) + 2NO2 (g) + 2H2O(l)

2. Cu(NO3)2 (aq) + 2NaOH (aq) --> Cu(OH)2 (s) + 2NaNo3(aq)

3. Cu(OH)2 (s) --> CuO (s) + H2O (l)

4. CuO (s) + H2SO4 (aq) --> CuSO4 (aq) + H2O (l)

5. CuSO4 (aq) + Zn (s) --> Cu (s) + ZnSO4 (aq)

6. Zn (s) + H2SO4 (aq) --> ZnSO4 (aq) + H2 (g)

7. Zn (s) + 2HCl (aq) --> ZnCl2 (aq) + H2 (g)

B. Balance the following equations. Write each in both themolecular and net ionic form. Idenfity each reaction as anacid-base reaction, a precipitation reaction, anoxidation-reduction reaction, or as a combination of more than oneof these types.

1. ___Pb(NO3)2 (aq) + ____ NaCl (aq) --> _____PbCl2 (s) +_____NaNO3 (aq)

a) Molecular Equation:

b) Net Ionic Equation:

c) Reaction Type:

2. ___HNO3 (aq) + _____Zn(OH)2 (s) --> ____Zn(NO3)2 (aq) +____H2O (l)

a) Molecular Equation:

b) Net Ionic Equation:

c) Reaction Type:

THANK YOU!

blushswan904

1. Cu (s) + 4HNO3 (aq) --> Cu(NO3)2 (aq) + 2NO2 (g) + 2H2O(l)

2. Cu(NO3)2 (aq) + 2NaOH (aq) --> Cu(OH)2 (s) + 2NaNo3(aq)

3. Cu(OH)2 (s) --> CuO (s) + H2O (l)

4. CuO (s) + H2SO4 (aq) --> CuSO4 (aq) + H2O (l)

5. CuSO4 (aq) + Zn (s) --> Cu (s) + ZnSO4 (aq)

6. Zn (s) + H2SO4 (aq) --> ZnSO4 (aq) + H2 (g)

7. Zn (s) + 2HCl (aq) --> ZnCl2 (aq) + H2 (g)

1. ___Pb(NO3)2 (aq) + ____ NaCl (aq) --> _____PbCl2 (s) +_____NaNO3 (aq)

a) Molecular Equation:

b) Net Ionic Equation:

c) Reaction Type:

2. ___HNO3 (aq) + _____Zn(OH)2 (s) --> ____Zn(NO3)2 (aq) +____H2O (l)

a) Molecular Equation:

b) Net Ionic Equation:

c) Reaction Type:

THANK YOU!

CHM 103 Lecture Notes - Lecture 11: Spectator Ion, Salt Metathesis Reaction, Chemical Equation

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