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JEOPARDY!
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Chemistry Final Review
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Bill Arcuri, WCSD
JEOPARDY!
Dissolving
Concentration
Parts of Solutions Solubility/
Precipitation
Acids and Bases
Real Life
Applications
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What does dissolve in water
mean?
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Dissolve in water means that the ions of
the compound break up when put in water
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What is an electrolyte?
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An electrolyte is a compound that
dissolves in water
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What are unsaturated, saturated,
and supersaturated solutions?
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Unsaturated means that more
solute can be added, saturated
means that a solution has
dissolved all the solute it can
hold, supersaturated means
that due to an increase in heat
a solution has more solute
dissolved than it can normally
hold.
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Break up (NH4)3PO4 into
ions
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3NH4+ + PO43-
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What is the formula for vinegar
and what kind of electrolyte is it?
Why?
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The formula is HCH3COO and it is a weak
electrolyte because the not many H+ ions
dissociate.
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If you 2.5 moles of Na+ is
dissolved in 5 L of water, what
is the molarity?
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.5 M
+
Na
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What is the molarity of Cl- in
1.2 M CaCl2?
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2.4 M
Cl
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Find the %(W/V) for 60 g of
solute in .6 L of a solution
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10%(W/V) Don’t forget to
convert to milliliters for
%(W/V)
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Find the molarity of 5.6 g of
lead nitrate in 400 mL water
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5.6 g x (l mol/331.2 g/mol)
= .0169 mol.
.0169 mol/.4 L = .0423 M
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Daily Double!!!
What is the total ion molarity for 6.7 g of
Ammonium Sulfide in 5 L of water?
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6.7 g x (1 mol Ammonium
Sulfide/68.154 g/mol) = .0983
mol
.0983 mol x 3 ions = .295 mol
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What is a solute?
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A solute is the chemical
that is dissolved
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If 11 moles of NaCl are
dissolved in 330 kg of water,
what is its molality?
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.033 m
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When magnesium chloride is
placed into water, it seems to
disappear. Does it disappear?
If not, why does it seem this
way?
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Magnesium chloride does
not disappear when put in
water, the particles are just
surrounded by water and
too tiny to see.
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What is hydration and ionization?
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Hydration is what occurs
when an ionic compound
dissolves in water,
ionization is the process
of breaking up the
compound into separate
ions.
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What kind of electrolytes
conduct electricity well? Why?
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Strong electrolytes
conducted electricity better
because they make freefloating ions in water.
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What is a precipitate?
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A precipitate is an insoluble
compound that does not
dissolve in water
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If silver nitrate was mixed with
sodium chloride, would a
precipitate form?
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Yes, AgCl would
precipitate
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Indicate what precipitates
forms, if any:
NaNO3 + Li2CO3
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No precipitate forms
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Indicate what precipitates forms, if any:
Ca(CH3COO)2 + Na3PO4
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Ca3(PO4)2 would form
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Indicate what precipitates forms,
if any:
Magnesium iodide and mercury
(I) flouride
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Hg2I2 and MgF2 would form
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What is the difference
between pH and pOH?
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pH is a measure of
+
the H concentration
and pOH is a
measure of the OH
concentration
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If there are .006 mol of H+ in 2 L
of water, what is the H+
concentration?
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.006 mol/2 L = .003 M
+
H
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If the pH increase by 2,
what happens to the H+
concentration?
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It decreases by 100
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What is the H+ concentration if
the pOH is 8.6?
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14 – 8.6 = 5.4
pH = 5.4
-5.4
-6
10 = 3.98 x 10
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Daily Double!!!
If .05 moles of HCl are put in 60 L
of water, what is the pH?
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.05 moles / 60 L = -4
8.33 x 10 M
(-8.33
x
10-4)
=
3.08
10
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What are real life uses for
an acid and a base?
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Acid: Batteries,
fertilizers, soaps,
shampoo, detergents
Base: Drain cleaner,
laxatives, antacids
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How could the sweetness of
lemonade be maximized in
accordance with saturation?
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Super saturation of the
lemonade with sugar
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What effects from acid rain suggest
that it is acidic?
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Corrosion of
metal/stone, lower the
pH of water bodies,
damage to nature via
resource ruination
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Name one important food
and the electrolyte in it
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+
(K ),
Banana
Salty foods
(Na+/Cl-), Milk (Ca2+), Leafy
2+
Greens (Mg )
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If you frequently have heartburn , would putting
ketchup on your French fries increase or
decrease the odds of you getting heartburn?
Why?
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It would increase your
odds of getting
heartburn because
ketchup has vinegar
(acetic acid), which is
acidic.
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Final Jeopardy
If .5 mol H2SO4 dissolved in 30 L of water is added to 2
mol HCl dissolved in 10 L of water, what is the pOH?
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.5 mol / 40 L = .0125 M x 2 H+ =
.025 M H+ in H2SO4
2 mol / 40 L = .5 M H+ in HCl.
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.025 M H+ in H2SO4 + .05 M H+ in
HCl = .075 M H+ total.
-log(.075 M) = 1.12
14 – 1.12 = 12.87
pOH = 12.87
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