Reversible reactions

What is a reversible reaction?

A reaction that can occur in both directions

When ammonium chloride is heated, what are the products of the reaction?

Ammonium and hydrogen chloride are formed

What is observed when hydrated copper sulfate is heated?

The colour change is blue to white and colourless liquid collects at the top of the test tube

What is an anhydrous salt?

Those that have lost their water of crystallisation

What are features of a system at equilibrium?

• the rate of the forward reaction equals the rate of thr reverse reaction

• The concentrations of reactants and products remains constant

What is Le Chateliers Principle?

If a change is made to the conditions of a system, the system will respond to counteract the change

What are three conditions that can change and later the position of equilibrium?

• concentration

• Temperature

• Pressure

If there is an increase in the amount of products formed, what has happened to the position of equilibrium?

It has shifted to thr right

If there is an increase in the amount of reactants formed, what has happened to the position of equilibrium?

It has shifted to the left

What is the effect of decreasing the concentration of a product?

If concentration of a product is decreased, more reactants will react until equilibrium is reached

If the concentration of a reactant decreases, how does the equilibrium shift?

To the right to reduce the effect of a decrease in reactant

In a reversible reaction, when is concentration of the reactants the highest?

The start or the reaction

What is an exothermic reaction?

Energy is released into surroundings resulting in temperature increase

What is an endothermic reaction?

Energy is taken in from thr surrounds resulting in temperature decrease

If the forward reaction is endothermic, would a high or low temperature increase the yield of products?

High, because the forward reaction is endothermic. A high temperature would favour the endothermic pathway to oppose the increase

if a pressure system decreases, how does the equilibrium of a reaction shift?

In the direction to produce the larger number of molecules of has to increase the pressure again