National Quali cations SPECIMEN ONLY

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1 National Quali cations SPEIMEN NLY SQ07//02 hemistry Section 1 Questions ate Not applicable uration 2 hours and 0 minutes Reference may be made to the hemistry igher and dvanced igher ata ooklet. Instructions for the completion of Section 1 are given on Page two of your question and answer booklet SQ07//01. Record your answers on the answer grid on Page three of your question and answer booklet. efore leaving the examination room you must give your question and answer booklet to the Invigilator; if you do not you may lose all the marks for this paper. *SQ0702*

2 SETIN 1 20 marks ttempt LL questions 1. Which type of bonding is never found in elements? Metallic London dispersion forces Polar covalent Non-polar covalent 2. In which of the following molecules will the chlorine atom carry a partial positive charge (δ+)? l r l l l F l I. Which of the following is not an example of a Van der Waals force? ovalent bonding ydrogen bonding London dispersion forces Permanent dipole-permanent dipole interactions 4. The diagram shows the melting points of successive elements across a period in the Periodic Table. Melting point/º Y Group number Which of the following is a correct reason for the low melting point of element Y? It has weak ionic bonds It has weak covalent bonds It has weakly-held outer electrons It has weak forces between molecules Page two

3 5. In which of the following will both changes result in an increase in the rate of a chemical reaction? decrease in activation energy and an increase in the frequency of collisions n increase in activation energy and a decrease in particle size n increase in temperature and an increase in the particle size n increase in concentration and a decrease in the surface area of the reactant particles 6. Which of the following is not a correct statement about the effect of a catalyst? The catalyst provides energy so that more molecules have successful collisions lowers the energy that molecules need for successful collisions provides an alternative route to the products forms bonds with reacting molecules. 7. The graph shows how the rate of a reaction varies with the concentration of one of the reactants Rate(1/t)/s _ oncentration/mol l _ 1 alculate the reaction time, in seconds, when the concentration of the reactant was 0 50 mol l Page three

4 8. In which line of the table are fat, protein and soap correctly classified? mides Salts Esters Fat Soap Protein Fat Protein Soap Soap Fat Protein Protein Soap Fat 9. The arrangement of amino acids in a peptide is Z-X-W-V-Y where the letters V, W, X, Y and Z represent amino acids. n partial hydrolysis of the peptide, which of the following sets of dipeptides is possible? V Y, Z X, W Y, X W Z X, V Y, W V, X W Z X, X V, W V, V Y X W, X Z, Z W, Y V 10. Which of the following compounds is an isomer of the structure shown above? utanal utanone utan-1-ol utanoic acid Page four

5 11. Erythrose can be used in the production of a chewing gum that helps prevent tooth decay. 2 Which of the following compounds will be the best solvent for erythrose? l l l Page five

6 12. Vanillin and zingerone are flavour molecules. vanillin 2 2 zingerone Which line in the table correctly compares the properties of vanillin and zingerone? More soluble in water More volatile vanillin vanillin vanillin zingerone zingerone vanillin zingerone zingerone 1. Soaps are produced by the following reaction Na(aq) Na+ This reaction is an example of condensation esterification hydrolysis oxidation. Page six

7 14. uring a redox process in acid solution, iodate ions, I (aq), are converted into iodine, I 2 (aq). I (aq) I 2 (aq) The numbers of + (aq) and 2 ( ) required to balance the ion-electron equation for the formation of 1 mol of I 2 (aq) are, respectively and 6 6 and 6 and and S 2 (g) + 2 (g) 2S (g) The equation represents a mixture at equilibrium. Which line in the table is true for the mixture after a further 2 hours of reaction? Rate of forward reaction Rate of back reaction decreases decreases increases increases unchanged decreases unchanged unchanged 16. 5N 2 4 ( ) + 4 NN 2 ( ) 4 2 (g) ( ) + 9N 2 (g) Δ = 5116 kj The energy released when 2 moles of each reactant are mixed and ignited is 117 kj 2046 kj 2258 kj 284 kj. Page seven

8 kj of energy are given out when 2 moles of aluminium react completely with 1 5 moles of oxygen. 2l(s) (g) l 2 (s) The enthalpy of combustion of aluminium, in kj mol -1, is Which of the following elements is the strongest reducing agent? Lithium romine Fluorine luminium cm of a solution could be most accurately measured out using a 50 cm beaker 50 cm burette 50 cm pipette 50 cm measuring cylinder. Page eight

9 20. Sulphur dioxide gas is denser than air and is very soluble in water. Which of the following diagrams shows the most appropriate apparatus for collecting and measuring the volume of sulphur dioxide given off in a reaction? measuring cylinder test tube measuring cylinder tub gas syringe [EN F SETIN 1. NW TTEMPT TE QUESTINS IN SETIN 2 F YUR QUESTIN N NSWER KLET.] Page nine

National Quali cations

SPEIMEN S813/76/12 National Quali cations NLY hemistry Paper 1 Multiple choice ate Not applicable uration 40 minutes Total marks 25 ttempt LL questions. You may use a calculator. Instructions for the completion