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Study Quiz 1
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1
Which of the following processes is an example of a reversible change that is at equilibrium?
A)Water boils in a pot with the lid on.
B)Salt is dissolved in water to make an unsaturated solution.
C)Water evaporates from a puddle on the road.
D)None of the above.
2
Which of the following physical processes does not reach equilibrium?
A)Sugar crystals in a saturated aqueous sugar solution.
B)A closed jar that contains liquid water.
C)A vapour above a pure solid in a closed system.
D)None of the above
3
A homogeneous equilibrium may involve
A)a reaction between two gases that produces a gaseous product
B)a reaction in which the reactants and products are in different phases
C)a reaction between an aqueous solution of ions that produces a solid precipitate
D)None of the above
4
Which of the following is not true?
A)Equilibrium is achieved in a reversible process when the rates of opposing changes are equal.
B)At equilibrium, changes in macroscopic properties of a system can be observed.
C)There is no observable change in pH when a system is at equilibrium.
D)There is no observable change in colour when a system is at equilibrium.
5
Equilibrium involves dynamic change
A)at the macroscopic level
B)at the molecular level
C)Both A and B
D)Neither A or B
6
Which of the following is not true?
A)Equilibrium can be reached in closed systems only.
B)Equilibrium can be reached only if a system is at a constant temperature.
C)At equilibrium, there is no overall change in the properties that depend on the total quantity of matter in the system.
D)None of the above
7
Which of the following is not true?
A)Equilibrium can be approached from either direction of a reaction.
B)At equilibrium, the concentration of reactants does not have to equal the concentration of products.
C)At equilibrium, the concentration of reactants must equal the concentration of products.
D)The rate of the forward and reverse reaction must be equal.
8
A sealed can contains carbonated liquid and a small space filled with carbon dioxide. Which of the following is true?
A)The pressure in the can will remain constant.
B)The pressure in the can will increase.
C)The temperature in the can will decrease.
D)The number of particles in the can will decrease.





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