CSEC Chemistry · May/June 2007 · Paper 2
43 questions and parts from this paper. Open one to see it in full, then practise it on Quelpr and get it marked against the mark scheme.
- 1(a)(i)4 marksUse the information given in Figure 1 above to complete Table 1 below.
- 1(a)(ii)1 markWrite a chemical equation for the reaction that occurs during the titration.
- 1(a)(iii)1 markThe number of moles of hydrochloric acid used in the titration
- 1(a)(iv)1 markThe number of moles of sodium hydroxide in 25.0 cm³ of the solution
- 1(a)(v)1 markThe number of moles of sodium hydroxide in 250 cm³ of solution
- 1(a)(vi)2 marksMass of sodium hydroxide dissolved in 250 cm³ of water (Relative atomic mass: Na = 23, O = 16, H = 1)
- 1(b)7 marksA student carries out the following tests on a solid, Q, and makes the observations recorded in Table 2 below. Complete Table 2 to show all possible inferences and write ionic equations where required.
- 1(b)(v)1 markSuggest the possible identity of Q.
- 1(c)(i)4 marksA suggested list of apparatus which you would use in recovering the solid sea salt from the sandy sea water
- 1(c)(ii)4 marksAn outline of the steps for the procedure you could use
- 1(c)(iii)2 marksList the main observations that would be expected at each stage of the experiment.
- 1(c)(iv)2 marksA student suggests that solid sea salt contains chloride ions. How would you go about testing for chloride ions in the solid sea salt?
- 2(a)(i)2 marksClassify Solution A as an oxidizing or a reducing agent in Experiments 1 and 2. Experiment 1: A is acting as... Experiment 2: A is acting as...
- 2(a)(ii)4 marksUsing the information given in Table 3 only, explain your answer to (a) (i) above. Experiment 1: Experiment 2:
- 2(b)(i)2 marksWrite a balanced ionic equation to represent the reaction that occurs in Experiment 4.
- 2(b)(ii)1 markAccount for the pale blue solution that is observed in Experiment 4.
- 2(c)3 marksWith reference to the electrochemical series, predict what you may be expected to observe in Experiment 3. Give a reason for your answer.
- 2(d)(i)1 markSuggest the name of a common household chemical that can be used to clean such tarnished copper ornaments.
- 2(d)(ii)2 marksWrite a suitable ionic equation to show the reaction in (d) (i) above.
- 3(a)4 marksComplete Table 4 by writing the required information in the relevant spaces.
- 3(b)(i)1 markWhat type of bonding would take place between A and B?
- 3(b)(ii)2 marksGive a reason for your answer in (b) (i) above.
- 3(b)(iii)2 marksUse dot cross diagrams to illustrate the bonding between A and B.
- 3(c)2 marksDescribe the bonding expected in A.
- 3(d)(i)2 marksDescribe the bonding in graphite.
- 3(d)(ii)2 marksGraphite is used as a lubricant. How does this use relate to its structure and bonding?
- 4(a)4 marksDeduce the molecular formula of X.
- 4(b)(i)1 markBased on your answer in 4 (a) on page 9, deduce the homologous series to which X belongs.
- 4(b)(ii)1 markWrite the name of Compound X.
- 4(b)(iii)1 markDraw the fully displayed structure of X.
- 4(c)(i)1 markTo what homologous series does Y belong?
- 4(c)(ii)1 markWrite the name of Compound Y.
- 4(c)(iii)2 marksDraw the fully displayed structure of Y.
- 4(d)2 marksWhat chemical test may be used to distinguish between Compounds X and Y? Reagent: Observation:
- 4(e)2 marksWhat reagent and reaction conditions are necessary to convert Y to X? Reagent: Conditions:
- 5(a)(i)2 marksAmphoteric oxide
- 5(a)(ii)2 marksAcid anhydride
- 5(b)(i)5 marksTo determine if zinc oxide is amphoteric
- 5(b)(ii)1 markTo determine if zinc oxide is an acid anhydride
- 5(c)(i)1 markWrite the formula for sulphur (IV) oxide.
- 5(c)(ii)1 markWrite an equation for the reaction between sulphur (IV) oxide and water.
- 5(d)(i)2 marksGive the name of ONE reagent that could be used for this purpose. Support your answer by writing a chemical equation, using ONE of the named pollutants mentioned above.
- 5(d)(ii)2 marksSuggest why the reagent you have named in (d) (i) above should be used in the powdered form.