JEOPARDY Game : Unit 9 Reaction RATES

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JEOPARDY Game Unit 9 Reaction RATES
EQUILIBRIUM
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RULES

• In teams, you will write the answer down on the
  black board.
• First team with correct answer held up will get
  the points.
• Winning team will get to pick next category.

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(No Transcript)
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• How fast a reaction occurs depends on what kind
  of interaction between molecules?

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Answer

• Collisions that lead to breaking of bonds

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• What can be added to a reaction to increase the
  reaction rate without being itself consumed by
  the reaction?

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Answer

• A catalyst

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• Reaction rates can be increased by what three
  factors?

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Answer

• Increased temperature, pressure, and concentration

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• The following chart indicates what kind of
  reaction?

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Answer

• Endothermic rxn

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• The energy required for a reaction to overcome
  the barrier in order to form the product is
  called what?

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Answer

• Activation energy, Ea.

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• What two things must exist for a bond to break?

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Answer

• Molecules must collide in correct orientation
  with sufficient amount of energy.

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• Give the reasons why the following collision
  results in the breaking of a bond and the
  formation of a new bond.

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Answer

• The smaller atom is oriented to an oppositely
  charged atom of another molecule and has enough
  energy upon collision to form a new bond.

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• What is the equation for determining the rate
  of a reaction?

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Answer

• Rate ? quantity
• time

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• What is the definition for equilibrium?

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Answer

• rate of forward rate of reverse rxn rxn

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• What does LeChateliers Principle state will
  happen if the concentration of any of the
  reactants or products is increased?

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Answer

• It will shift in the direction that consumes the
  excess concentration.

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• What is the formula for the Keq equation?

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Answer

• Keq Cc Dd
• Aa Bb

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• Set up the following to solve for Keq
• 2S(s) 5F2(g) ? SF4(g) SF6(g)

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Answer

• Keq SF4SF6
• F25

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• How and why does the energy of the products
  compare to the energy of the reactants for this
  reaction?

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Answer

• The energy of the products is less than that of
  the reactants because energy was released during
  the reaction.

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• Set up and Calculate Keq for
• Fe3(aq) SCN-(aq) ?? FeSCN2(aq)
• if Fe3 0.55 M
• SCN- 0.001 M
• FeSCN2 0.001 M

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Answer

• Keq . 0.001 .
• 0.550.001

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DAILY DOUBLE
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• Why are solids and liquids not included in the
  equilibrium expression?

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Answer

• Because they are pure substances whose density
  doesnt change at different temperatures,
  therefore they are constants.

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• In a sealed bottle that is half full of water,
  molecules are changing phases from a liquid to a
  gas and from a gas to a liquid. When will
  equilibrium be attained?

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Answer

• WHEN
• rate of rate of
• evaporation condensation

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• When an equilibrium shifts to the right, what
  happens to the concentration of the reactants?

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Answer

• concentration decreases

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• Why does increasing the concentration of a
  reactant increase the reaction rate?

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Answer

• Increased concentration
• increased number of collisions
• more bonds breaking increased rate of
  reaction.

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DAILY DOUBLE
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• State the two reasons why the activation energy
  is high to make a product.

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Answer

• Because atoms must collide in order to react
  (collision theory) and with the right orientation.

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• 2S(s) 5F2(g) ? SF4(g) SF6(g)
• An increase in concentration of F2 would drive
  the equilibrium which direction?

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Answer

• To the right.

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• If the forward reaction of a system in
  equilibrium is endothermic, increasing the
  temperature of the system will _____.

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Answer

• cause the forward reaction to occur in order to
  obtain equilibrium again.
• or
• shift equilibrium to the right.

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• What does an inhibitor do in a chemical reaction?

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Answer

• Increases the activation energy required for a
  reaction to go to completion and decreases the
  rate of reaction.

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• How might the addition of a noble gas to a
  reaction vessel affect this equilibrium?
• 2N2H4(g) 2NO2(g) ?? 3N2(g) 4H O(g)
• Assume volume of vessel doesnt change.

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Answer

• Addition of noble gas doesnt change the
  partial pressure or concentrations of the
  reactants or products, so equilibrium is not
  affected.

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• Calculate the Keq for the following equilibrium
  when
• SO3 0.0160 M
• SO2 0.00560 M
• O2 0.00210 M
• 2SO3(g) ?? 2SO2(g) O2(g)

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Answer

• Keq 0.005602 0.00210
• 0.01602
• Keq 0.000257 2.57 x 10-4

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• What is activation energy?

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Answer

• The barrier the reactants must overcome in order
  to form products.