Y9 Review / Y10 Check Up 1. Work out the relative formula mass of the following (3) CH4 __________ CaCO3 __________ Li2SO4 __________ 2i. Write the electronic configuration of a magnesium atom (1) ________________________ ii. Write out the electronic configuration of magnesium ion (1) ________________________ iii. Which of these group 1 metals is the most reactive? (1) Lithium Caesium Potassium Sodium 3i. Complete this grid to show the formula of the following ionic compounds (3) Cl- O2- Mg2+ MgCO3 Na+ K+ CO32- Na2O KCl ii. Which of the ions in the table above is a polyatomic ion? (1) ________________________ 4i. The general formula for alkanes is CnHn+2 What is the formula of the alkane with 12 carbon atoms? (1) ________________________ ii. Write out these displayed formula as molecular formula (2) ___________ ___________ iii. Complete these dot cross diagrams to show the covalent bonding (2) Show only the outer layers of electrons H Cl F Cl iv. Write out these molecular formula as displayed formula (2) C2H6 CO2 5. Balance the following equations (3) CH4 + O2 CO2 + H2O Mg + H2O Mg(OH)2 + H2 Al + H2SO4 Al2(SO4)3 + H2 6. Hydrochloric acid and magnesium carbonate react to form magnesium chloride, carbon dioxide and water. Write out a word equation and then a balanced formula equation for this reaction. State symbols are not needed. Word equation (2) Formula Equation (2)