Name _____________________________________ Period ____
If molecules were people...
http://ed.ted.com/lessons/if-molecules-were-people-george-zaidan-and-charles-morton
1. What is/are the requirement(s) for a collision to result in a reaction?
a. Both proper orientation and enough energy
b. Only proper orientation
c. Only enough energy
d. Either proper orientation or enough energy
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2. Which of the following statements is true:
a. All chemical reactions happen in one direction (forward)
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b. All chemical reactions happen in both directions (forward and reverse)
c. Some chemical reactions happen only in the forward direction, but most happen in both
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directions
d. Some chemical reactions happen only in the forward direction, and some happen only in the
reverse direction
3. At the very beginning of a reversible reaction, what is the rate of the reverse reaction?
a. Slower than the forward reaction, but greater than zero
b. Zero
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c. Faster than the forward reaction
d. Impossible to tell
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4. What is the ratio between reactants and products after equilibrium has been established?
a. It’s always 1:1 (50/50)
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b. It could be 1:1, but it could also be anything else
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c. It’s never 1:1
d. It’s always 1:2
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5. How do chemists measure the rate of reactions and the position of equilibria?
a. By doing a bunch of experiments in the lab
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b. By looking closely at the molecular structures of the reactants and products
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c. By looking up the values in books
d. By typing the reaction into a computer program
6. Look at the first four collisions in the video. In collision A, two people bump into each other.
In collision B, two molecules (the large one is ethene, the small one is hydrogen) bump into each
other. In collision C, the same two people bump into each other; and in collision D, the same two
molecules bump into each other. In collisions A and B, no reaction happens. In collisions C and
D, reactions do happen. Look closely at the four collisions and give two reasons why reactions
happen in cases C and D but not in cases A and B.
7. Explain why the rate of the reverse reaction must be zero at the very, very beginning of a
reversible reaction. Explain why the rate of the reverse reaction increases as the reaction
proceeds.
8. Explain why the proportion of reactants and products at equilibrium does not have to be 50/50.