Self assessment
Question 1 of 4
Which of the following is a closed system?
A
Adding hydrochloric acid to sodium carbonate solution in an open test tube.
B
Adding hydrochloric acid to sodium hydroxide solution in an open test tube.
C
Adding hydrochloric acid to pieces of zinc in a test tube and connecting the end of the tube to a deflated balloon.
D
Adding hydrochloric acid to magnesium oxide in an open test tube.
In which of the following is there a dynamic equilibrium?
A
A wet towel on a clothes line.
B
A wet towel in a zipped-up sports bag.
C
A cup of tea with a sugar lump at the bottom of the cup.
D
An ice cube in water at 0 ºC.
Which of the following is true when an equilibrium is formed starting with reactants?
A
The rate of the forward reaction decreases and then stops.
B
The rate of the forward reaction increases and then stops.
C
The rate of the forward reaction remains the same. The rate of the reverse reaction increases until it equals the rate of the reverse reaction.
D
The rate of the forward reaction decreases and then remains constant.
Which of the following are characteristics of a dynamic equilibrium?
A
It only occurs in an open system.
B
The rate of the forward reaction is equal to the rate of the reverse reaction.
C
The concentrations of reactants and products are equal.
D
The concentrations of reactants and products are constant.