2019

QUESTION 10 (Start on a new page.) The flow diagram below shows the processes involved in the industrial preparation ofan ammonium fertiliser. 10.1 Write down the NAME or FORMULA of: 10.1.1 Gas X (1) 10.1.2 Gas Y (1) 10.1.3 Acid Q (1) 10.2 Write down the: 10.2.1 TYPE of chemical reaction that converts compound P … Read more

QUESTION 9 (Start on a new page.) Chlorine is produced industrially by the electrolysis of a concentrated sodium chloridesolution, NaCℓ(aq). The balanced equation for the net (overall) cell reaction is as follows: 9.1 Define the term electrolysis. (2) 9.2 For the above reaction, write down the: 9.2.1 Half-reaction that takes place at the cathode (2) … Read more

QUESTION 8 (Start on a new page.) A standard electrochemical cell is set up using two standard half-cells, as shown in thediagram below. 8.1 State the energy conversion that takes place in this cell. (1) 8.2 What is the function of component Q? (1) X is a metal. A voltmeter connected across the cell initially … Read more

QUESTION 7 (Start on a new page.) A hydrogen bromide solution, HBr(aq), reacts with water according to the followingbalanced chemical equation: The Ka value of HBr(aq) at 25 °C is 1 x 109. 7.1 Is hydrogen bromide a STRONG ACID or a WEAK ACID? Give a reason for the answer. (2) 7.2 Write down the … Read more