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Title: Three Major Classes of Chemical Reactions
Description: General Chemistry I, CU Boulder.
Description: General Chemistry I, CU Boulder.
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Three Major Classes of Chemical Reactions
Wednesday, September 16, 2 015
08:20
Three major classes:
1
...
Acid-Base
3
...
What is the molarity of 2
...
𝟐𝟓]
58
...
0 𝐿 𝑠 𝑜𝑙𝑢𝑡𝑖𝑜𝑛
2
...
mL of 0
...
400𝑚𝑜𝑙 194
...
𝟒𝒈
1000𝑚𝐿
1𝐿
1𝑚𝑜𝑙
3
...
400 M K2CrO4 solution?
0
...
𝟖𝟎𝟎]
4
...
What volume of 2
...
3g AlCl3?
3HCl + Al(OH)3 > AlCl3 + 3H2O
1𝑚𝑜𝑙 𝐴𝑙𝐶𝑙3
3𝑚𝑜𝑙 𝐻𝐶𝑙
1𝐿
13
...
33𝑔 𝐴 𝑙𝐶𝑙3 1𝑚𝑜𝑙 𝐴 𝑙𝐶𝑙3 2
...
150𝐿 𝑥 ⎯⎯⎯⎯⎯⎯⎯⎯= 𝟏𝟓𝟎
...
3g AlCl3?
3HCl + Al(OH)3 > AlCl3 + 3H2O
1𝑚𝑜𝑙 𝐴𝑙𝐶𝑙3
3𝑚𝑜𝑙 𝐻𝐶𝑙
1𝐿
13
...
33𝑔 𝐴 𝑙𝐶𝑙3 1𝑚𝑜𝑙 𝐴 𝑙𝐶𝑙3 2
...
150𝐿 𝑥 ⎯⎯⎯⎯⎯⎯⎯⎯= 𝟏𝟓𝟎
...
What is the [ClO4-‐] when 5
...
0L of
solution?
Answer: 2
...
• The moles of solute in the solution do not change, just the volume
...
What volume of 0
...
00L of
0
...
100](1
...
250𝐿
[0
...
When 200
...
40 M NaCl is mixed with 600
...
20 M NaCl, what is
the resulting [NaCl]?
(0
...
400]+(0
...
200]/0
...
600=0
...
• Use the solubility guidelines to predict if the possible products are soluble or
not
...
• Write the states accordingly
...
: shows all reactants and products as intact compounds
2) Total ionic eqn
...
: eliminates "spectator ions" and shows actual chemical change
Acid-‐Base Rxns ( Neutralization or Proton Transfer) Examples:
3 Ways to Represent Aqueous Ionic Reactions
1) Molecular eqn
...
: shows soluble ionic compounds as ions
3) Net ionic eqn
...
• At the equivalence point, # moles H+ = # moles OH-‐
• Much of the time the acid-‐base stoichiometry is 1:1 but, some acids have 2mol
H+/mole acid or 2mol OH-‐/mole base
Concept Question
0
...
50M NaOH is needed to neutralize 0
...
What is the concentration of
the HCl solution?
(
...
5) 0
...
2L =
...
If the ON
B) +5
C) +6
D) +7
Look at the ON of e ach element in the reactants versus the products
...
Quick check: See if an element when from its elemental form to an ionic form or from
an ionic form to its elemental form
...
Its ON went down ("reduced"/"oxidizing agent")
...
Its ON went up ("oxidized"/"reducing agent")
...
Activity Series -‐ used for predicting redox reactions
...
Using the AS, predict which of the following reactions will occur
...
What is the reducing agent in the following redox reaction: 2H2(g) + O2(g) > 2H2O
Title: Three Major Classes of Chemical Reactions
Description: General Chemistry I, CU Boulder.
Description: General Chemistry I, CU Boulder.