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Recent content by Anam Ayesha Khan

  1. Anam Ayesha Khan

    Chemistry 9701 Multiple choice questions

    Thank you...
  2. Anam Ayesha Khan

    CAIE Oct/Nov 2020 session discussion

    Two reactions and their enthalpy changes are shown. 2C(s) + 2H2(g) → C2H4(g) ∆Ho = +52.2 kJ mol–1 C2H2(g) + H2(g) → C2H4(g) ∆Ho = –175.8 kJ mol–1 These data can be used to calculate the enthalpy change for the reaction shown. 2C(s) + H2(g) → C2H2(g) ∆Ho= X What is the value of X? A –228.0 kJ...
  3. Anam Ayesha Khan

    CAIE Oct/Nov 2020 session discussion

    The reaction between sulfur dioxide and oxygen is reversible. 2SO2(g) + O2(g) 2SO3(g) Kc = 280 mol–1 dm3 at 1000K In an equilibrium mixture at 1000K the sulfur trioxide concentration is 6.00mol dm–3. The sulfur dioxide concentration is twice the oxygen concentration. What is the sulfur dioxide...
  4. Anam Ayesha Khan

    Chemistry 9701 Multiple choice questions

    A small quantity of hot, concentrated sulfuric acid is added separately to solid samples of potassium halides, KX. Which potassium halides react and produce a mixture of products that include a halogen, X2? 1 potassium iodide 2 potassium bromide 3 potassium chloride (the answer is saying 1...
  5. Anam Ayesha Khan

    Chemistry 9701 Multiple choice questions

    An excess of chlorine was bubbled into 100 cm3 of hot 6.0 mol dm–3 sodium hydroxide. How many moles of sodium chloride would be produced in the reaction? A 0.3 B 0.5 C 0.6 D 1.2 I need the working and explanation for this please.(the answer is B)
  6. Anam Ayesha Khan

    Chemistry 9701 Multiple choice questions

    if you could answer my other questions,it would be good..thanks :)
  7. Anam Ayesha Khan

    Chemistry 9701 Multiple choice questions

    Four elements, W, X, Y and Z, have electronic configurations as shown. W X Y Z 2,4 2,6 2,8,2 2,8,8,1 Which formulae represent compounds that have boiling points below room temperature? 1 WX2 2 YX 3 Z2X I need explanation for this please.. ( It says option 1 is the answer)
  8. Anam Ayesha Khan

    Chemistry 9701 Multiple choice questions

    The reaction between sulfur dioxide and oxygen is reversible. 2SO2(g) + O2(g) 2SO3(g) Kc = 280 mol–1 dm3 at 1000K In an equilibrium mixture at 1000K the sulfur trioxide concentration is 6.00mol dm–3. The sulfur dioxide concentration is twice the oxygen concentration. What is the sulfur dioxide...
  9. Anam Ayesha Khan

    Chemistry 9701 Multiple choice questions

    The reaction of bromine with warm NaOH(aq) produces products with the same oxidation numbers, in the same ratios, as the reaction of chlorine with hot NaOH(aq).In one reaction between bromine and warm NaOH(aq), 30.2 g of a product containing sodium, bromine and oxygen is produced. Which mass of...
  10. Anam Ayesha Khan

    Chemistry 9701 Multiple choice questions

    In which species is there a lone pair of electrons? A. CH3 B. CH3+ C. CH3– D. CH4 I need explanation for this please..(THE ANSWER IS C)
  11. Anam Ayesha Khan

    Chemistry 9701 Multiple choice questions

    Two reactions and their enthalpy changes are shown. 2C(s) + 2H2(g) → C2H4(g) ∆Ho = +52.2 kJ mol–1 C2H2(g) + H2(g) → C2H4(g) ∆Ho = –175.8 kJ mol–1 These data can be used to calculate the enthalpy change for the reaction shown. 2C(s) + H2(g) → C2H2(g) ∆Ho= X What...
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