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Constructed Response . Topic 9 : Kinetic and Equilibrium
Set A: Factors affecting reaction rate, Collision Theory
Base your answers to questions 1 through 3 on the information below.
A Student wishes to investigate how the reaction rate changes with a
change in concentration of HCl(aq).
Given the equation.
Zn(s) + HCl(aq) --------- > H2(g) + ZnCl2(aq)
Write your answers here.
1. Describe the effect of increasing concentration 1.
of HCl(aq) on the reaction rate and justify your
response in terms of Collision Theory.
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2. Identify one other variable that might affect the rate 2.
and should be held constant during this investigation.
3. Identify the independent variable in this investigation . 3.
Set B: : Saturated solution, Equilibrium, Le Chatelier’s principle
Base your answers to questions 4 and 5 on the information below.
Given the equilibrium equation at 298 K
+
KNO3(s) + 34.89 KJ < ----------- > K (aq) + NO3- (aq)
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4. The equation indicates that KNO3 has formed a 4.
saturated solution. Explain , in terms of equilibrium,
why the solution is saturated.
5. Describe, in terms of Le Chatelier’s principle, why 5.
an increase in temperature increases the solubility of KNO3.
Set C: Potential Energy Diagram
6. On the set of axes provided:
Sketch the potential energy diagram for an endothermic chemical reaction that shows the activation
energy and the potential energy of the reactants and the potential energy of the products.
Potential Energy
Reaction Coordinate
Copyright©2010 E3 Scholastic Publishing. All Rights Reserved. SurvivingChem.com 397
Set A: Factors affecting reaction rate, Collision Theory
Base your answers to questions 1 through 3 on the information below.
A Student wishes to investigate how the reaction rate changes with a
change in concentration of HCl(aq).
Given the equation.
Zn(s) + HCl(aq) --------- > H2(g) + ZnCl2(aq)
Write your answers here.
1. Describe the effect of increasing concentration 1.
of HCl(aq) on the reaction rate and justify your
response in terms of Collision Theory.
Teacher Preview Copy
2. Identify one other variable that might affect the rate 2.
and should be held constant during this investigation.
3. Identify the independent variable in this investigation . 3.
Set B: : Saturated solution, Equilibrium, Le Chatelier’s principle
Base your answers to questions 4 and 5 on the information below.
Given the equilibrium equation at 298 K
+
KNO3(s) + 34.89 KJ < ----------- > K (aq) + NO3- (aq)
Teacher Preview Copy
4. The equation indicates that KNO3 has formed a 4.
saturated solution. Explain , in terms of equilibrium,
why the solution is saturated.
5. Describe, in terms of Le Chatelier’s principle, why 5.
an increase in temperature increases the solubility of KNO3.
Set C: Potential Energy Diagram
6. On the set of axes provided:
Sketch the potential energy diagram for an endothermic chemical reaction that shows the activation
energy and the potential energy of the reactants and the potential energy of the products.
Potential Energy
Reaction Coordinate
Copyright©2010 E3 Scholastic Publishing. All Rights Reserved. SurvivingChem.com 397
