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Chemistry Grade 10 Unit 4: Energy Changes and Electrochemistry

national exam questions have come from this unit. It runs 32 pages; one careful study pass takes about 4.4 hours, and its difficulty is moderate among Chemistry units. Each section below lists the questions set from it, with the year, and opens the page that teaches it.

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4.1 Introduction · read p. 167
  • 2018 E.C., Q8 – Someone conducts an experiment by using a test tube with unknown compounds. If he/she touches the outer surface of the test tube during the reaction progress, he/she feels hot. This indicates the reaction that takes plac
  • 2016 E.C., Q55 – A chemical reaction that releases heat energy to the surrounding is known as _____.
  • 2015 E.C., Q53 – A system does 15 J of work and no other changes take place. Which of the following function has fallen by 15 J?
  • 2014 E.C., Q45 – Which one of the following types of energy change occurs from the combustion of carbon in oxygen?
  • 2014 E.C., Q41 – What is the change in internal energy (ΔE) for a reaction, in which the system absorbs 650 J of heat and 125 J of work is done on the system?
  • 2014 E.C., Q4 – What is enthalpy change? It is
  • 2012 E.C., Q18 – Given the reaction: H2 + Cl2 → 2HCl. Which statement best describes the energy changes as bonds are formed and broken in this reaction.
  • 2011 E.C., Q61 – What is the change in internal energy of a system that releases 12.4 J of heat and does 4.2 J of work on the surroundings
  • 2011 E.C., Q4 – What does it mean by H = negative for a given process?
  • 2006 E.C., Q44 – A gas is confined to a cylinder under constant atmospheric pressure. When the gas undergoes a particular chemical reaction, it releases $135\text{kJ}$ of heat to its surroundings and does $63\text{kJ}$ of P-V work on its
  • 2005 E.C., Q48 – Consider the following gaseous reaction at 250C: CH (g) + 20 (g) →CO (g) + 2H O(g) ΔH = 4 2 2 2 −802 kJ CH 4 Which energy change would occur if 3.2 moles of is completely combusted? 2.57 × 103 2.57 × 102
  • 2005 E.C., Q67 – Gaseous petrol in a combustion system has done 375kJ of work during its expansion in the piston. Simultaneously, it absorbed 586 kJ of heat from the engine. What is the internal energy change during the process?
  • 2005 E.C., Q14 – Enthalpy is defined as the heat content of the system at constant:
4.2 Energy Changes in Electrochemistry · read p. 174
  • 2018 E.C., Q42 – Non-metals usually have poor electrical conductivity and are often brittle. However, they are widely used in electrical insulation and chemical industries. Which evaluation best explains how these properties affect their
  • 2015 E.C., Q51 – Which one of the following is responsible for electrolytic conductivity?
  • 2015 E.C., Q27 – One of the basic differences between metallic conduction and electrolytic conduction is:
  • 2014 E.C., Q14 – Which of the following is a chemical property of aluminum?
  • 2012 E.C., Q28 – We have three aqueous solutions of NaCl labeled 'A', 'B', and 'C' with concentrations 0.1 m, 0.01 m, and 0.001 m, respectively. The van't Hoff factor for these solutions will be
4.3 Electrochemical Cells · read p. 182
  • 2015 E.C., Q50 – Which one of the following galvanic cell is an example of secondary cell?
  • 2012 E.C., Q59 – What substance is reduced in an alkaline-cell battery?
  • 2012 E.C., Q48 – Which batteries are faced with leak out and environmental problem respectively?
  • 2005 E.C., Q42 – A 1M solution of is placed in a beaker with a strip of Cu metal. A 1M of is placed in a second beaker with a strip of Sn metal. The two beakers are then connected by a salt bridge and the two metal electrodes are connect
4.4 Electrolysis · read p. 187
  • 2018 E.C., Q40 – In a Galvanic cell consisting of Zinc and Copper electrodes, which of the following process occurs at the anode electrode?
  • 2017 E.C., Q18 – In an activity during laboratory session a small amount of lead bromide ( ) crystals were placed in a beaker. Two electrodes are inserted until they are in contact with the crystals. When the crystals in the beaker are g
  • 2017 E.C., Q62 – Which of the following is the overall reaction for electrolysis of molten $\mathrm{NaCl}$?
  • 2016 E.C., Q50 – Consider the following diagram of an electrolytic cell: Which of the following is CORRECT from the given diagram
  • 2016 E.C., Q51 – Which of the following is CORRECT about molten electrolytes and aqueous electrolytes?
  • 2015 E.C., Q67 – Which one of the following is TRUE about the electrolysis of a molten hypothetical electrolyte, MX?
  • 2015 E.C., Q54 – Which of the following is CORRECTLY stated about the spontaneity of a reaction?
  • 2015 E.C., Q12 – Which one of the following explains how electroplating takes place?
  • 2014 E.C., Q53 – Why is CaCl₂ added to NaCl in a 1:1⁄2 ratio in the Down's cell for the manufacturing of sodium metal?
  • 2014 E.C., Q37 – The process in which a compound absorbs electrical energy and decomposes into its elements is
  • 2013 E.C., Q47 – The electrolysis of liquid (molten) NaCl in the set-up for the electrochemical cell is given in the following figure below. Which of the following statements is true about the electrolysis of molten sodium chloride?
  • 2013 E.C., Q57 – The statement 'the amount of a substance consumed or of produced in an electrolytic cell is directly proportional to the amount of electricity that passes through the cell' is known as
  • 2012 E.C., Q42 – Which of the following is NOT true about the anode of an electrolytic cell?
  • 2012 E.C., Q5 – If different processes are used to bring about the same change the enthalpy changes during these processes are the same, this is the statement of
  • 2007 E.C., Q7 – Which kind of energy is converted in a galvanic cell?
  • 2006 E.C., Q14 – The electrolysis of molten $\mathrm{NaCl}$ is an industrial process. What does the electrolysis produce?