10.1 The equations below represent two industrial processes involved in the preparation of ammonium nitrate. Write down the:10.1.1 NAME of substance A (1)10.1.2 FORMULA of substance B (1)10.1.3 NAME given for reaction I (1)10.1.4 NAME or FORMULA of the catalyst used in reaction I (1)10.1.5 Name of process X (1)10.1.6 Name of process Y (1)10.1.7 … Read more
Stone A is projected vertically upwards at a speed of 12 m∙s-1 from a height h above the ground. Ignore the effects of air resistance. 3.1 Calculate the time taken for stone A to reach its maximum height. (3) At the same instant that stone A is projected upwards, stone B is thrown vertically downwards … Read more
The simplified diagram below represents an electrochemical cell used in the refining of copper. One of the electrodes consists of impure copper. 9.1 What type of power source, AC or DC, is used to drive the reaction in this cell? (1) 9.2 When an electric current passes through the CuCl2(aq), the mass of electrode P … Read more
2.1 An 8 kg block, P, is being pulled by constant force F up a rough inclined plane at an angle of 30o to the horizontal, at CONSTANT SPEED. Force F is parallel to the inclined plane, as shown in the diagram below. 2.1.1 State Newton’s First Law in words. (2) 2.1.2 Draw a labelled … Read more
8.1 Learners set up a galvanic cell and measure its emf under standard conditions. 8.1.1 Write down the name of component Y. (1)8.1.2 Is Al the ANODE or the CATHODE? (1)8.1.3 Write down the overall (net) cell reaction that takes place in this cell when it is working. (3)8.1.4 Calculate the initial emf of this … Read more
7.1 Ammonia ionises in water to form a basic solution according to the following balanced equation: 7.1.1 Is ammonia a WEAK or a STRONG base? Give a reason for the answer. (2)7.1.2 Write down the conjugate acid of NH3(g). (1)7.1.3 Identify ONE substance in this reaction that can behave as an ampholyte in some reactions. … Read more
Carbonyl bromide, COBr2, decomposes into carbon monoxide and bromine according to the following balanced equation: COBr2(g) ⇌ CO(g) + Br2(g) ∆H > 0 Initially COBr2(g) is sealed in a 2 dm3 container and heated to 73 °C. The reaction isallowed to reach equilibrium at this temperature. The equilibrium constant for thereaction at this temperature is … Read more
A group of learners uses the reaction between powdered zinc and EXCESS dilute hydrochloric acid to investigate one of the factors that affects the rate of a chemical reaction. The balanced equation for the reaction is: Zn(s) + 2HCl(aq) → ZnCl2(aq) + H2(g) They conduct two experiments. The reaction conditions used are summarised in the … Read more
The flow diagram below shows how an alcohol (compound P) can be used to prepare other organic compounds. The letters A to E represent different organic reactions. X, Y and Z are organic compounds. 4.1 Is compound P a PRIMARY, SECONDARY or TERTIARY alcohol? Give a reason for the answer. (2) 4.2 Write down the … Read more
The vapour pressure versus temperature graph below was obtained for four straight chain (unbranched) alkanes (P, Q, R and S).FROM P TO S, EACH COMPOUND DIFFERS FROM THE PREVIOUS COMPOUND BY A –CH2 GROUP.The vapour pressures are measured in mmHg. Atmospheric pressure is 760 mmHg. 3.1 Give a reason why alkanes are said to be … Read more