Reversible Reactions & Dynamic Equilibrium

Question 1

Some reactions go to completion where the reactants are used up to form the products and the reaction stops when all of the reactants are used up

In reversible reactions ……..

Answer 1

the products can react to reform the original reactants

To show a reversible reaction, two opposing half arrows are used: ⇌

Question 2

In a dynamic equilibrium the reactants and products are dynamic meaning?

Answer 2

they are constantly moving

Question 3

In a dynamic equilibrium the rate of the forward reaction is the same as the rate of the …………….. reaction in a …….. system

and the ……………………………… remains constant

Answer 3

backward reaction

closed system

concentration of reactants and products remain constant

Question 4

A closed system is one in which

Answer 4

none of the reactants or products escape from the reaction mixture

Question 5

In an open system

Answer 5

matter and energy can be lost to the surroundings

Question 6

When a reaction takes place entirely in solution, equilibrium can be reached in open flasks as a

Answer 6

negligible amount of material is lost through evaporation

Question 7

If the reaction involves gases, equilibrium can only be reached in a

Answer 7

closed system

Question 8

Exam Tip
A common misconception is to think that the concentrations of the reactants and products are equal.

However, they are not equal but they remain constant at dynamic equilibrium (i.e. the concentrations are not changing).

The concentrations will change as the reaction progresses, only until the equilibrium is reached