1. Aim # 10: How can we predict the products of a chemical reaction (part 2)?
H.W. # 10a
Study pp (sec )
Ans. ques. p. 223 # 1,3
p. 245 # 7,8,10,11
Read pp

2. Do Now: Given the balanced equation Ca + 2H2O → X + H2 What is the correct formula of the product X?

3. IV Double Replacement Reactions compound 1 + compound 2 → compound 3 + compound 4 AB + CD → AD + CB
In order for a double replacement reaction to
Occur, a cation and an anion must be removed
from solution chemically. There are 3 ways
for this to occur:

4. 1. Formation of water This usually occurs in acid-base reactions. e.g. HCl(aq) + NaOH(aq) → NaCl(aq) + H2O(l)
2. Formation of a gas
e.g. NaHCO3(aq) + HCl(aq) →
NaCl(aq) + H2CO3(aq)
but: H2CO3 → H2O(l) + CO2(g)
3. Formation of a precipitate
e.g. 3NaCO3(aq) + 2AlCl3(aq) →
6NaCl(aq) +Al2(CO3)3(s)

5. We can predict when precipitates will form. Reference Table F
Problem: K2CO3(aq) + CaCl2(aq) → ?
Will these compounds react to form new ones?
“Switching Partners”,
K2CO3(aq) + CaCl2(aq) → 2KCl(?) + CaCO3(?)
According to Ref. Table F
CaCO3 is insoluble- it will precipitate!
Therefore , the reaction will occur.

6. Predict whether the following reactions will occur
Predict whether the following reactions will occur. If yes, predict the products.
1. Pb(NO3)2(aq) + NaCl(aq) → ?
Ans: PbCl2(s) + NaNO3(aq)
2. NaC2H3O2(aq) + KCl(aq) → ?
Ans: NO REACTION

7. 3. A solution of silver nitrate is mixed with a
solution of sodium chromate.
Ans: 2AgNO3(aq) + Na2CrO4(aq) →
Ag2CrO4(s) + 2NaNO3(aq)
4. A solution of nickel(II) nitrate is mixed with a solution of potassium carbonate.
Ans: Ni(NO3)2(aq) + K2CO3(aq) →
NiCO3(s) + 2KNO3(aq)

8. 5. FeCl3(aq) + NaOH(aq) →
Fe(OH)3(s) + NaCl(aq)
6. CuSO4(aq) + NaNO3(aq) →
NO REACTION
7. (NH4)2S(aq) + CoCl2(aq) →
NH4Cl(aq) + CoS(s)

9. 8. CuSO4(aq) + Na2CO3(aq) →
CuCO3(s) + Na2SO4(aq)