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Thanksgiving Break

Extra Practice
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CHEM1103F2023

Thanksgiving break

Limiting and
Excess LO68-69

01

Limiting/Excess/Percent Yield/Theoretical yield.

If 76.8g grams of oxygen gas and 80.1g of aluminum are in a reaction mixture and the % yield for the reaction is
82.5%, how many grams of aluminum oxide will be produced. Balance first: _ O2 (g) + _Al(s) -> Al2O3

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A reaction vessel contains 84.03g N2 and 104.1g Li, which reacts to form Li3N. What is the mass of excess reactant
remaining? YOU SHOULD BALANCE AN EQUATION FIRST

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Molarity LO71-74

02

Limiting/Excess. Dilutions. Conversions.. yadada

What volume of 0.156 M Na3PO4 solution is necessary to completely react with 90.7 ml of 0.118 M CaCl2
_CuCl2 _Na3PO4(aq)+ _CuCl2(aq)-> _Cu3(PO4)2 (s) +_ NaCl(aq)

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Calculate the molarity of potassium ions in the final solution if 75.0 mL of 0.800 M potassium phosphate is added
to 125 mL of 0.600 M potassium sulfate.

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Sulfuric acid (H2SO4) reacts with aluminum metal to form aluminum sulfate and hydrogen gas. What is
the minimum amount of 2.5 M H2SO4 necessary to react completely with excess Al to form 84.7 g of
aluminum sulfate (molar mass of 342.17 g/mol)? Need to balance

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A 15.0 mL sample of 0.200 M Na3PO4 is combined with 125 mL 0.0600 M AgNO3. The precipitate (Ag3PO4) is collected
and dried and found to have a mass of 0.942g. Calculate the percent yield.

_Na3PO4(aq)+ _AgNO3(aq) -> _Ag3PO4(s) +_NaNO3(aq)

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Solubility
LO75-79

03

Completing reactions, NR or R, Complete ionic
equation v Net ionic equation. USE THE CHART
FROM THE BOOK. It will be given on the exam.

Aqueous Potassium phosphate reacts with aqueous lead (II) acetate in a precipitation
reaction.

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Write the complete ionic equation for the precipitation reaction between Aqueous iron (III) nitrate
and aqueous potassium carbonate.

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Write the net ionic equation for the precipitation reaction between Aqueous iron (III) nitrate and
aqueous potassium carbonate.

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Oxidation and Reduction
LO80-82

04

Oxidation and reduction

+oxidation is the loss of electrons, and a fundamental definition of reduction is the gain of electrons.

+The oxidation state of an atom in a free element is 0.

+The oxidation state of a monatomic ion is equal to its charge.

+The sum of the oxidation states of all atoms in:

●a neutral molecule or formula unit is 0.

●an ion is equal to the charge of the ion.

+In their compounds, metals have positive oxidation states.

●Group 1A metals always have an oxidation state of +1.

●Group 2A metals always have an oxidation state of +2.

+In their compounds, we assign nonmetals oxidation states according to the table on the right. Entries at the
top of the table take precedence over entries at the bottom of the table.

READ THE CHAPTER FIRST

Consider the following reaction, which of the following is/are true. SELECT ALL that apply
Cr₂O₇^2- + 3HNO₂ + 5H⁺ -> 3NO₃^-

+ 4H₂O

a.

The O and H atoms do not change oxidation state in this
reaction.

b.

N is oxidized in this reaction

c.

The N in NO3- has an oxidation state of -3

d.

The Cr in Cr2O72- ion serves as the reduction agent.

Multiple Select

which of the following is/are true

• a

• b

• c

• d

a.

The O and H atoms do not change oxidation state in this reaction.

b.

N is oxidized in this reaction

c.The N in NO3

^- has an oxidation state of -3

d.

The Cr in Cr2O7

^2- ion serves as the reduction agent.

Naming rules

Endings

Acid ending

Example

Acid name

ate

-ic acid

Phosphate PO4

3-

H3PO4 Phosphoric
acid

ite

-ous acid

Sulfite SO3

2-

H2SO3 Sulfurous acid

ide

Hydro______ic acid

Cl-

HCl hydrochloric acid

Which of the following acids is/are named correctly?

a. HBrO is Hypobromous acid
b. H2S is hydrosulfuric acid
c. H3PO4 is phosphoric acid
d. HClO2 is chloric acid
e. HBr is hypobromous acid
f. H2CO3 hydrocarbonic acid

Multiple Select

which of the following is/are true

• a

• c

• d

• f

• b

Which of the following acids is/are named correctly?

HBrO is Hypobromous acid
H2S is hydrosulfuric acid
H3PO4 is phosphoric acid
HClO2 is chloric acid
HBr is hypobromous acid
H2CO3 hydrocarbonic acid

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