Aqa A Level Chemistry Paper 1 Study Guide Rated A+

What is the function of a porous separator in an electrochemical cell? (1) {Ans: 1. to allow ions to move 2. completes the circuit 3. acts as a salt bridge}What is the equation for the reaction between MgO and water? (1) What is the pH of the solution formed? (1) {Ans: 1. MgO + H2O -> Mg(OH)2 2. pH 9}What is the equation for the reaction between Na2O and water? (1) What is the pH of the solution formed? (1) {Ans: 1. Na2O + H2O -> 2NaOH 2. pH 13}Explain the trend in the ionisation energy down a group (1) {Ans: 1. ionisation energy decreases, it is easier to move an electron because the atomic radius increases, nuclear charge increases and the shielding increases}In the Contact process, sulfur(IV) oxide is converted into sulfur(VI) oxide using vanadium(V) oxide as a catalyst. Give two equations to show how the vanadium(V) oxide acts as a catalyst in this process (2) {Ans: 1. V2O5 + SO2 -> V2O4 + SO3 2. V2O4 + 1/2O2 -> V2O5}State the meaning of the term strong acid (1) {Ans: 1. completely dissociates in solution to form H+ ions}