Which is the correct symbol to show a reversible reaction?
=
→
⇌
What happens to the concentrations of reacting substances at equilibrium?
They remain constant
They remain equal to each other
They keep changing
Which of the following is a reversible reaction?
Combustion
The reaction between anhydrous copper sulfate and water
Neutralisation
What is a disadvantage to industry of a reversible reaction?
Too high a temperature is needed
The product has to be separated from a mixture which costs money
Too high a pressure is needed
What happens to the forward and backward reactions at equilibrium?
They stop
They keep going
They repeatedly stop then start again
To which side does the equilibrium position shift if the pressure is increased?
Always to the right
To the side with fewer molecules
To the side with more molecules
To which side does the equilibrium position shift if the temperature is increased?
In the direction of the endothermic reaction
In the direction of the exothermic reaction
To which side does the equilibrium position shift if the concentration of a reacting solution is increased?
In the direction towards this solution
In the direction away from this solution
The thermal decomposition of calcium carbonate is reversible: CaCO3(s) ⇌ CaO(s) + CO2(g). What happens to the position of equilibrium when the pressure is increased?
It moves to the left
It does not change
It moves to the right
Hydrogen can be made by reacting carbon with steam: C(s) + H2O(g) ⇌ H2(g) + CO(g). How can the equilibrium concentration of hydrogen be increased?
Increase the concentration of steam
Increase the concentration of carbon monoxide
Use less carbon in the reaction