January 2018 NY Regents Chemistry Exam
50 Given the balanced equation representing a reaction: CH4(g) + 2O2(g) → CO2(g) + 2H2O(g) + energy Which change in reaction conditions will increase the frequency of effective collisions between reactant molecules? (1) decreasing the pressure of the reactants (2) decreasing the temperature of the reactants
(3) increasing the concentration of the reactants
(4) increasing the volume of the reactants
Solution: The frequency of effective collisions will increase with increased temperature, increased surface area of the reactants, and increased concentration of the reactants.
Answer: 3
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