Write an equation for calcium reacting with dilute nitric acid. You do not need to include state symbols.
If calcium metal is added to dilute sulfuric acid, it reacts strongly at first. After a short while, a layer of calcium sulfate forms on the calcium metal and the reaction stops. Some calcium metal and dilute sulfuric acid are still left unreacted. Explain these observations.
Draw the ‘dot-and-cross’ diagram for the cation found in calcium ethanedioate. Show all of the electrons.
Draw the displayed formula of the anion found in calcium ethanedioate.
Suggest one use of calcium chlorate(I).
Chlorate(I) ions are produced when cold aqueous sodium hydroxide reacts with chlorine. Write an ionic equation for this reaction. State symbols are not required.
The chlorate(I) ion is unstable and breaks down on heating, as shown. Work out the oxidation number of chlorine in each species. Fill in the boxes. $3\text{ClO}^- \rightarrow 2\text{Cl}^- + \text{ClO}_3^-$
In terms of electron transfer, what happens to the chlorine in reaction (iii)?
Identify the two other products made when lactic acid reacts with calcium carbonate.
State suitable reagents and conditions for reactions 1 and 3.
Name the type of reaction that takes place in reaction 2.
Reaction 4 uses $\text{NaBH}_4$. State the function of $\text{NaBH}_4$ in this reaction.
Lactic acid contains a chiral centre. State what is meant by the term chiral centre.