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WorksheetsKinetics Quiz 20
Total questions: 21
Worksheet time: 1hrs 3mins
Which change of phase is exothermic?
H2O(s) ->H2O(g)
NH3(l) -> NH3(g)
H2S(g) -> H2S(l)
CO2(s) -> CO2(l)
Consider the reaction: H2O(l) + energy -> H2(g) + ½ O2(g) Which of the following phrases best describes this reaction?
endothermic, absorbing energy
endothermic, releasing energy
exothermic, absorbing energy
exothermic, releasing energy
As the temperature of a system increases, the entropy of the system...
decreases
increases
remains the same
Which series of physical change represents an entropy increase during each change?
solid → liquid → gas
gas → liquid → solid
solid → gas → solid
liquid → gas → solid
As products are formed in the following reaction, NH4+(aq) → NH4Cl(s) + 14.6kJ, the entropy of the system
decreases and heat is absorbed
increases and heat is released
increases and heat is absorbed
decreases and heat is released
As the number of effective collisions between the reactant particles in a chemical reaction decreases, the rate of the reaction
remains the same
increases
decreases
Given the reaction:
A+B->C+D
The reaction will most likely occur at the greatest rate if A and B represent
solutions of nonpolar molecular compounds
ionic compounds in the solid phase
nonpolar molecular compounds in the solid phase
solutions of ionic compounds
Given the reaction:
Zn(s) + 2HCl(aq) --> Zn2+(aq) + 2Cl-(aq) + H2(g)
If the concentration of the HCl(aq) is increased, the frequency of reacting collisions will
decrease, producing a decrease in the reaction rate
increase, producing an increase in the reaction rate
increase, producing a decrease in the reaction rate
decrease, producing an increase in the reaction rate
Raising the temperature speeds up the rate of a chemical reaction by increasing
the effectiveness of the collisions, only
neither the effectiveness nor the frequency of the collisions
the frequency of the collisions, only
both the effectiveness and the frequency of the collisions
Beaker A contains a 1-gram piece of zinc and beaker B contains 1 gram of powdered zinc. If 100 milliliters of 0.1 M HCl is added to each of the beakers, how does the rate of reaction in beaker A compare to the rate of reaction in beaker B?
The rate in B is greater due to the smaller surface area of the zinc.
The rate in A is greater due to the smaller surface area of the zinc.
The rate in A is greater due to the larger surface area of the zinc.
The rate in B is greater due to the larger surface area of the zinc.
The addition of a catalyst to a system at equilibrium will increase the rate of...
the forward reaction, only
both the forward and reverse reactions
the reverse reaction, only
neither the forward nor reverse reaction
Given the equilibrium reaction at constant pressure:
2HBr(g) + 72.7kJ <-> H2(g) + Br2(g)
When the temperature is increased, the equilibrium will shift to the...
left, and the concentration of HBr(g) will decrease
right, and the concentration of HBr(g) will decrease
right, and the concentration of HBr(g) will increase
left, and the concentration of HBr(g) will increase
Energy is released when the atoms of two elements bond to form a compound. Compared to the total potential energy of the atoms before bonding, the total potential energy of the atoms after bonding is...
lower and the compound formed is unstable
higher and the compound formed is unstable
lower and the compound formed is stable
higher and the compound formed is stable
A system is said to be in a state of dynamic equilibrium when the
rate at which products are formed is greater than the rate at which reactants are formed
concentration of products is the same as the concentration of reactants
rate at which products are formed is the same as the rate at which reactants are formed
concentration of products is greater than the concentration of reactants
Based table I, the most energy would be released when oxygen reacts completely with 1.0 mole of
C6H12O6
CO
CH4
CH3OH
Based table I, how many kilojoules of heat are given off when 0.500 mole of formed Al2O3(s) is from its elements?
838 kJ
13,404 kJ
1,676 kJ
3,351 kJ
A flask at 25°C is partially filled with water and stoppered. After a period of time the water level remained constant. Which relationship best explains this observation?
The rates of condensation and evaporation are both zero.
The rate of evaporation exceeds the rate of condensation.
The rate of condensation exceeds the rate of evaporation.
The rate of evaporation equals the rate of condensation.
Given the reaction at equilibrium:
AgCl(s) <-> Ag+(aq) + Cl-(aq)
The addition of Cl- ions will cause the concentration of Ag+(aq) to
decrease as the amount of AgCl(s) increases
increase as the amount of AgCl(s) increases
increase as the amount of AgCl(s) decreases
decrease as the amount of AgCl(s) decreases
According to the graph, is energy absorbed or released during the reaction?
absorbed
released
Which lettered interval represents the PE of the reactants?
A
B
C
D
Which lettered interval would change by the addition of a catalyst?
A
B
C
D
