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Rxn Rate/Table I/PE Diagrams
Test Description: Review of Rate of Reaction, Table I, and Potential Energy Diagrams
Instructions: Answer all questions to get your test result.
1) A catalyst can increase the rate of a reaction by
A
increasing the activation energy
B
decreasing the activation energy
C
decreasing the potential energy of the products
D
increasing the potential energy of the products
2) According to Table I, what is the heat of reaction for the formation of 2 moles of H2O(l) from hydrogen and oxygen gas
A
-55.8 kJ
B
-571.6 kJ
C
-483.6 kJ
D
+571.6 kJ
3) Based on Table I, which reaction is endothermic?
A
CH4(g) + 2 O2(g) --> CO2(g) + 2 H2O(l)
B
NaOH(s) --> Na+(aq) + OH-(aq)
C
2CO(g) + O2(g) --> 2CO2(g)
D
NH4Cl(s) --> NH4+(aq) + Cl-(aq)
4) According to Table I, which salt releases energy as it dissolves?
A
KNO3
B
LiBr
C
NH4NO3
D
NaCl
5) Which statement describes characteristics of an endothermic reaction?
A
The sign of H is positive, and the products have more potential energy than the reactants.
B
The sign of H is negative, and the products have more potential energy than the reactants.
C
The sign of H is positive, and the products have less potential energy than the reactants.
D
The sign of H is negative, and the products have less potential energy than the reactants
6) Which statement explains why the speed of some chemical reactions is increased when the surface area of the reactant is increased?
A
This change increases the density of the reactant particles.
B
This change alters the electrical conductivity of the reactant particles.
C
This change exposes more reactant particles to a possible collision
D
This change increases the concentration of the reactant
7) What is the very top of the curve on a potential energy diagram known as.
A
Activation Energy
B
Potential Energy of the Products
C
Activated complex
D
Delta H
8) Increasing the temperature increases the rate of a reaction by
A
lowering the frequency of effective collisions between reacting molecules
B
increasing the frequency of effective collisions between reacting molecules
C
increasing the activation energy
D
lowering the activation energy
9) The heat of reaction (delta H) is equal to the
A
heat content of the products minus the heat content of the reactants
B
entropy of the products minus the entropy of the reactants
C
entropy of the reactants minus the entropy of the products
D
heat content of the reactants minus the heat content of the products
10) According to Table I, what is the value of delta H if 2 moles of C(s) are added to oxygen (O2) to produce carbon dioxide (CO2)
A
-393.5 kJ
B
+393.5 kJ
C
+787 kJ
D
-787 kJ
*select an answer for all questions
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