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CHAPTER 16: Reaction Rates
Answer each question as completely
as possible. Remember that you must show work for points.
For questions #1-5 use the reaction coordinate diagram below.
Reaction
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1. Fill in the blanks on the reaction coordinate diagram above with the appropriate
letters. Not all
letters will be used.
a. Reactants
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d.
Energy absorbed
b. Products
e. Activated complex
c.
f.
Energy released
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2. How much energy do the reactants have? (Use units of kJ.)__
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3. How much energy do the products have? (Use units of kJ.)
Activation energy
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4. Circle the answer that makes the statement true: The reaction shown in the reaction
,
coordinate diagram above is exothermic@dotherm@)
a. Explain why you chose either exothermic or endothermic.
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5. Using the reaction coordinate diagram above, draw a new curve that shows how a catalyst
would affect the reaction pathway.
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6. Specify whether each reaction is exothermic or endothermic:
a. The burning of wood to produce a hot flame.
b. 4Fe(s) + 302(g) ~ 2Fe203(s) + energy
o-rke em 'c
substances.
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c. A test tube that feels cold after mixing two
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7. Put a checkmark next to the actions that would most likely INCREASEthe reaction rate.
a. __
Lowering the temperature
of the reactants.
b. __
Diluting an aqueous solution of HCI with water before adding a piece of
magnesium.
c.
L Grinding a solid into fine particles.
d.
1
Adding an enzyme catalyst.
e. __
Adding an inhibitor.
8. Suppose two molecules that can react collide. What TWO other things need to occur for the
molecules to react?
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9.
In the gas-phase reaction, lz + Clz ~ 21CI,[12]changes from 0.400M at 0.00 min to 0.300M at
4.00 min. Calculate the average reaction rate in moles of 12consumed per liter per minute.
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10. In a reaction Mg(s) + 2HCI(aq) ~ H2(g) + MgCb(aqL 6.00 g of Mg was present at 0,00 min. After
3.00 min, 4.50 g of Mg remained, Express the average rate as mol of Mg consumed per minute.
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