1. According to the collision theory, for a chemical reaction to occur, which of
ID: 940081 • Letter: 1
Question
1. According to the collision theory, for a chemical reaction to occur, which of the following is correct?
A) The reactants must be present at a high concentration.
B) The collision must occur with enough kinetic energy.
C) The colliding species must be oriented correctly.
D) Two of the above.
E) All of the above.
2. If one elementary step in a sequence is much slower than the others, the rate of the overall reaction will be determined by, and in fact be the same as, the rate of the slow step. The slow step is known as the
A) collisions step
B) rate determining step
C) rate constant step
D) activation step
E) radical step
3. The activation energy is
A) the energy required to form an activated complex.
B) the energy evolved in an exothermic reaction.
C) the difference in energy between reactants and products.
D) less than zero for an exothermic reaction.
E) none of the above
In the reaction H2 (g) + I2 (g) --> <--- 2 HI (g), a mixture that initially contains 2 mole hydrogen and 1 mole iodine produces, at equilibrium:
A) 1 mole HI
B) 2 moles HI
C) more than 1 but less than moles HI
D) less than 2 moles HI
E) insufficient information given
Explanation / Answer
1)E.All the above
2)B.rate determining step
3)A.The energy requred to form an activated complex
4)B.two moles of HI
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