In Experiment 23: Factors Affecting Reaction Rates (often based on the Beran lab manual), the pre-lab focuses on identifying how specific conditions change the speed of a chemical reaction.
Experiment 23: Factors Affecting Reaction Rates
Study online at https://quizlet.com/_85m4x6
1. Factors that affect the rate of the chemi-
cal reaction that were tested
Nature of reactants, Temperature of the chem-
ical system, presence of a catalyst, and concen-
tration of the reactants
2. Temperature of the chemical system 10 C rise in temperature doubles the reaction
rate (increasing by a factor of 2) 2^n
Added heat increases the number of collisions
between reactant molecules and the kinetic
energy
3. Change in kinetic energy is kinetic energy is converted to an internal
energy (energy contained within the mole-
cules/ions when they collide. Increase in IE
increases the probability for the weaker bonds
to be broken and the new bonds to be formed.
4. presence of a catalyst Increases the rate of the chemical reaction
without undergoing any net chemical change.
-some increase the rate of only one specific
chemical reaction without affecting similar re-
actions
-Catalysts reroute the pathway of a chemical
reaction so that the alternative pathway has a
lower activation energy for a reaction than an
uncatalyzed reaction.
5. Concentration of the reactants increased concentrations usually increase re-
action rate
6. Surface area of reactants (not tested) The greater the exposed surface area of the
reactant, the greater the reaction rate.
7. H2SO4, HCl, H3PO4, CH3COOH
1 / 2
Experiment 23: Factors Affecting Reaction Rates
Study online at https://quizlet.com/_85m4x6
List the acids in order by higher to lower
reaction rate
8. List the metals in order by higher to lower
reaction rate
Mg, Zn, Cu
9. Relationship between temperature and
reaction rate
As temperature increases, reaction rate in-
creases (speeds up)
10. What was the catalyst in the reaction MnO2
11. What happened when the catalyst
(MnO2) was added?
Evolution of gas O2
12. What does a catalyst do? Lowers the activation energy
13. What is the equation for the reaction that
occurred between MnO2 and H2O2?
2H2O2 (aq) -> 2H2O (l) + O2 (g)
14. What is the equation for the Iodic
Acid-Sulfurous Acid System?
3HIO3(aq) + 8H2SO4 --> H+ (aq) + I3-(aq) +
8H2SO4(aq) + H2O(l)
15. In the Iodic Acid-Sulfurous Acid System,
what color appears once I3- forms?
a deep-blue starch-iodine complex
16. The higher the concentration of reac-
tants
the faster the reaction
17. The lower the concentration of reactants the slower the reaction
18. 1 ml = how many drops 20 drops
2 / 2
