Rxn Rate/Table I/PE Diagrams: Question Preview (ID: 8704)


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A catalyst can increase the rate of a reaction by
a) decreasing the activation energy b) increasing the potential energy of the products c) decreasing the potential energy of the products d) increasing the activation energy
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) -483.6 kJ b) +571.6 kJ c) -55.8 kJ d) -571.6 kJ
Based on Table I, which reaction is endothermic?
a) NH4Cl(s) --> NH4+(aq) + Cl-(aq) b) NaOH(s) --> Na+(aq) + OH-(aq) c) CH4(g) + 2 O2(g) --> CO2(g) + 2 H2O(l) d) 2CO(g) + O2(g) --> 2CO2(g)
According to Table I, which salt releases energy as it dissolves?
a) KNO3 b) NaCl c) LiBr d) NH4NO3
Which statement describes characteristics of an endothermic reaction?
a) The sign of H is positive, and the products have less 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 negative, and the products have less potential energy than the reactants d) The sign of H is positive, and the products have more potential energy than the reactants.
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
What is the very top of the curve on a potential energy diagram known as.
a) Delta H b) Activated complex c) Activation Energy d) Potential Energy of the Products
Increasing the temperature increases the rate of a reaction by
a) lowering the activation energy b) increasing the frequency of effective collisions between reacting molecules c) lowering the frequency of effective collisions between reacting molecules d) increasing the activation energy
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 reactants minus the entropy of the products c) entropy of the products minus the entropy of the reactants d) heat content of the reactants minus the heat content of the products
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) -787 kJ c) +787 kJ d) -393.5 kJ
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