The positions of some elements are shown. The letters are not the chemical symbols of the elements. Using the labelled elements, give the letter for: (i) the element that forms an amphoteric oxide, (ii) the element with the greatest first ionisation energy, (iii) the element that gives a soluble hydroxide and an insoluble sulfate, (iv) the most volatile element in a group containing elements in all three states of matter at room temperature and pressure, (v) the element that produces the largest cation.
State and explain the conditions magnesium needs before it can react with oxygen.
State what would be observed during the reaction in (b)(i).
Write an equation for magnesium reacting with cold water. Include state symbols.
Write the equation for the thermal decomposition of magnesium nitrate.
Calcium carbonate undergoes thermal decomposition to give a solid product that is important in industry. This solid product then reacts with water to form a substance commonly called slaked lime. Write equations for the thermal decomposition of calcium carbonate and for the reaction of the solid product to produce slaked lime.
Describe how calcium carbonate and calcium hydroxide are used in agriculture, and explain why these compounds are suitable for that use.
Write an ionic equation to show this use of calcium carbonate.