10.1 The flow diagram below shows the processes involved in the industrialpreparation of fertiliser Q. Write down the: 10.1.1 Name of process X (1) 10.1.2 Name of process Y (1) 10.1.3 NAME or FORMULA of gas P (1) 10.1.4 Balanced equation for the formation of compound B (3) 10.1.5 Balanced equation for the formation of … Read more
In the electrochemical cell below, carbon electrodes are used during the electrolysis of a concentrated sodium chloride solution. The balanced equation for the net (overall) cell reaction is: 2H2O(ℓ) + 2Cℓ ─(aq) → Cℓ2(g) + H2(g) + 2OH─(aq) 9.1 Is the reaction EXOTHERMIC or ENDOTHERMIC? (1) 9.2 Is electrode P the ANODE or the CATHODE? … Read more
8.1 A nickel (Ni) rod is placed in a beaker containing a silver nitrate solution, AgNO3(aq) and a reaction takes place. Write down the: 8.1.1 NAME or FORMULA of the electrolyte (1) 8.1.2 Oxidation half-reaction that takes place (2) 8.1.3 Balanced equation for the net (overall) redox reaction that takesplace (3) 8.2 A galvanic cell … Read more
7.1 A learner dissolves ammonium chloride (NH4Cℓ) crystals in water and measures the pH of the solution. 7.1.1 Define the term hydrolysis of a salt. (2) 7.1.2 Will the pH of the solution be GREATER THAN, SMALLER THAN or EQUAL TO 7? Write a relevant equation to support your answer. (3) 7.2 A sulphuric acid … Read more
Hydrogen gas, H2(g), reacts with sulphur powder, S(s), according to the followingbalanced equation: The system reaches equilibrium at 90 °C. 6.1 Define the term chemical equilibrium. (2) 6.2 How will EACH of the following changes affect the number of moles of H2S(g) at equilibrium? Choose from INCREASES, DECREASES or REMAINS THE SAME. 6.2.1 The addition … Read more
Hydrogen peroxide, H2O2, decomposes to produce water and oxygen according to the following balanced equation: 5.1 The activation energy (EA) for this reaction is 75 kJ and the heat of reaction (ΔH) is –196 kJ. 5.1.1 Define the term activation energy. (2) 5.1.2 Redraw the set of axes below in your ANSWER BOOK and then … Read more
Butane (C4H10) is produced in industry by the THERMAL cracking of long-chainhydrocarbon molecules, as shown in the equation below. X represents an organiccompound that is produced. 4.1 Write down: 4.1.1 ONE condition required for THERMAL cracking to take place (1) 4.1.2 The molecular formula of compound X (1) 4.1.3 The homologous series to which compound … Read more
The boiling points of three isomers are given in the table below. 3.1 Define the term structural isomer. (2) 3.2 What type of isomers (POSITIONAL, CHAIN or FUNCTIONAL) are these three compounds? (1) 3.3 Explain the trend in the boiling points from compound A to compound C. (3) 3.4 Which ONE of the three compounds … Read more
The letters A to F in the table below represent six organic compounds. 2.1 Write down the LETTER that represents the following: 2.1.1 A hydrocarbon (1) 2.1.2 A functional isomer of compound F (1) 2.1.3 A compound which belongs to the same homologous series as compound B (1) 2.1.4 A plastic (1) 2.2 Write down … Read more
MULTIPLE-CHOICE QUESTIONS Various options are provided as possible answers to the following questions. Write down the question number (1.1–1.10), choose the answer and make a cross (X) over the letter (A–D) of your choice in the ANSWER BOOK. EXAMPLE: 1.1 In a chemical reaction an oxidising agent will … A lose protons.B gain protons.C lose … Read more