Relate the information given in all the four columns of the table.

Sodium hydroxide and hydrochloric acid react as shown in this equation.

NaOH + HCl → NaCl + H₂O

(aq) (aq) (aq) (l)

i) Which type of chemical reaction is this?

ii) The reaction is exothermic. Explain what that means.

iii) Differentiate exothermic reaction and endothermic reaction.

iv) What happens to the temperature of the solution as the chemicals react?

Take two conical flasks. Label them as I and II. Take a small amount of copper sulphate solution in the first conical flask. Take a small amount of granulated zinc in the second conical flask. Allow the copper sulphate solution to react with the zinc.

i) Name the type of reaction.

ii) Say whether the metal zinc is more reactive or less reactive.

iii) Write the complete and balanced reaction.

iv) Say whether this change is reversible or irreversible.

When lead powder is added to copper chloride solution, a displacement reaction occurs and solid copper is formed.

i) Write the equation for the reaction.

ii) Why does the displacement reaction occur?

When zinc and copper (II) sulphate are heated together, the following redox reaction occurs:

Zn + CuSO₄→ ZnSO₄ + Cu

(s) (aq) (aq) (s)

i) What does the word redox stand for?

ii) Show how electrons are transferred in the reaction.

iii) Write the ionic equation for the redox reaction.