Annie Termaat and Christopher Talbot Solutions for Chapter: How Can We Shift the Balance of a Reaction?, Exercise 12: SOME SUMMATIVE PROBLEMS TO TRY

When potassium chlorate $\left(\mathrm{V}\right)$ is heated strongly it breaks down, forming potassium chloride and oxygen.

Three test tubes were set up as described in the table and heated equally strongly. Every so often a glowing splint was held above the test tube for the production of oxygen. Time taken for a fixed volume of oxygen to be produced was measured. 

Analyse the information in the table and suggest a scientific reason for the inclusion of this experiment in tube $3$.

When potassium chlorate $\left(\mathrm{V}\right)$ is heated strongly it breaks down, forming potassium chloride and oxygen. Potassium chlorate and potassium chloride are soluble in water.

Manganese $\left(\mathrm{IV}\right)$ oxide is insoluble in water. Suggest how you could show that manganese $\left(\mathrm{IV}\right)$ oxide was not used up in this reaction.

When potassium chlorate $\left(\mathrm{V}\right)$ is heated strongly it breaks down, forming potassium chloride and oxygen. Potassium chlorate and potassium chloride are soluble in water. Manganese $\left(\mathrm{IV}\right)$ oxide is insoluble in water. Suggest how you could show that manganese $\left(\mathrm{IV}\right)$ oxide could catalyse the same reaction again.

Explain how an activated complex or transition state contributes to the success of a chemical change.

Explain how atomic orbits are thought to contribute to the steric effect.

Explain the difference between thermal dissociation and thermal decomposition.

Explain how a closed system is necessary for reversible reaction to reach equilibrium.

Explain why food cooks more quickly in a pressure cooker.