National Quali cations

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1 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 of Paper 1 are given on page 02 of your answer booklet S813/76/02. Record your answers on the answer grid on page 03 of your answer booklet. You may refer to the hemistry ata ooklet for igher and dvanced igher. Space for rough work is provided at the end of this booklet. efore leaving the examination room you must give your answer booklet to the Invigilator; if you do not, you may lose all the marks for this paper. *S *

2 Total marks 25 ttempt LL questions 1. Which of the following elements, at room temperature, could be described as monatomic? rgon oron Iodine Sulfur 2. The table shows the first three ionisation energies of aluminium. Ionisation energy (kj mol 1 ) 1st 2nd 3rd Using this information, what is the enthalpy change, in kj mol 1, for the following reaction? l 3+ (g) + 2e l + (g) Which element has the greatest attraction for bonding electrons? romine hlorine Lithium Sodium 4. Which of the following chlorides is likely to have the most ionic character? el 2 al 2 sl Lil page 02

3 5. Which of the following elements would have the strongest London dispersion forces? rgon hlorine Nitrogen xygen 6. The shapes of some common molecules are shown below and each contains at least one polar bond. Which molecule is non-polar? l l l l 7. Which of the following is an isomer of hexan-2-ol? [Turn over page 03

4 8. spirin and oil of wintergreen are used in medicine. Their structures are shown below. 3 3 aspirin oil of wintergreen Identify the term which can be applied to aspirin but not to oil of wintergreen. ldehyde Ketone Ester arboxylic acid 9. The structure of caryophyllene, which can be extracted from clove oil, is Which of the following would be the best solvent for extracting caryophyllene? page 04

5 10. In α-amino acids the amino group is on the carbon atom next to the carboxyl group. Which of the following is an α-amino acid? 3 2 N 2 2 S N 2 N N [Turn over page 05

6 page The 2-pyrones are esters used as flavourings and in perfumes. The name 2-pyrone comes from the carbonyl group being in position 2 in the structure shown. 1 2 Which of the following structures is the pyrone responsible for the smell of chocolate, 4-hydroxy-6-methyl-2-pyrone?

7 12. Which of the following reactions can be classified as reduction? () () Which of the following structural formulae represents a tertiary alcohol? [Turn over page 07

8 14. mixture of sodium bromide and sodium sulfate is known to contain 10 moles of sodium and 4 moles of bromide ions. ow many moles of sulfate ions are present? g of sodium is added to 4 8 litres of oxygen to form sodium oxide. When the reaction is complete, which of the following statements will be true? (Take the volume of 1 mole of oxygen to be 24 litres.) 0 10 mol of oxygen will be left unreacted mol of sodium will be left unreacted mol of oxygen will be left unreacted mol of sodium oxide will be formed. 16. student obtained a certain volume of carbon dioxide by the reaction of 20 cm 3 of 2 mol l 1 hydrochloric acid, l, with excess sodium carbonate. 2l(aq) + Na 2 3 (aq) 2Nal(aq) + 2 (g) + 2 (l) The student carried out a similar experiment using sulfuric acid, 2 S 4. 2 S 4 (aq) + Na 2 3 (aq) Na 2 S 4 (aq) + 2 (g) + 2 (l) Which solution of sulfuric acid would give the same final volume of carbon dioxide when added to excess sodium carbonate? 10 cm 3 of 2 mol l 1 20 cm 3 of 2 mol l 1 10 cm 3 of 4 mol l 1 20 cm 3 of 4 mol l 1 page 08

9 17. In a reversible reaction, equilibrium is reached when molecules of reactants stop changing into molecules of products the concentrations of reactants and products are equal the concentrations of reactants and products are constant the activation energy of the forward reaction is equal to that of the reverse reaction. 18. Ethanol is manufactured by reacting ethene with steam. 2 4 (g) + 2 (g) 2 5 (g) = 46 kj mol 1 Which set of conditions would give the best yield of ethanol at equilibrium? igh temperature, low pressure igh temperature, high pressure Low temperature, high pressure Low temperature, low pressure 19. When copper carbonate is reacted with excess acid, carbon dioxide is produced. The curves shown were obtained under different conditions. P Volume of 2 Q Time The change from P to Q could be brought about by increasing the concentration of the acid decreasing the mass of copper carbonate decreasing the particle size of the copper carbonate adding a catalyst. [Turn over page 09

10 20. The potential energy diagram for a reaction is shown. Potential energy (kj mol 1 ) Reaction pathway, in kj mol 1, for the forward reaction is 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 allows more molecules to have energies greater than the activation energy. 22. Which of the following equations represents an enthalpy of combustion? 2 6 (g) (g) 2 2 (g) (l) 2 5 (l) + 2 (g) 3 (l) + 2 (l) 3 (l) + 2 (g) 3 (l) 4 (g) (g) (g) (l) page 10

11 23. 5N 2 4 (l) NN 2 (l) 4 2 (g) (l) + 9N 2 (g) = 5116 kj The energy released when 2 moles of each reactant are mixed and ignited is 2046 kj 2558 kj 4093 kj 5116 kj. [Turn over page 11

12 24. chemist analysed a mixture of four dyes,, and using gas-liquid chromatography. In this technique, compounds are separated depending on their polarity, with the most polar having the longest retention times. The chromatogram obtained is shown below. oncentration Increasing retention time Which of the following compounds was present in greatest concentration? ye Structure page 12

13 25. Ethanol and ethanoic acid are flammable liquids. Which of the following diagrams shows the correct set up for the separation of ethanol from ethanoic acid? water in heating mantle water out water out heating mantle water in water in water out water out water in [EN F SPEIMEN QUESTIN PPER] page 13

14 SPE FR RUG WRK page 14

15 SPE FR RUG WRK page 15

16 FR S813/76/02 ate Not applicable uration 40 minutes FFIIL USE National Quali cations SPEIMEN NLY Mark hemistry Paper 1 Multiple choice nswer booklet *S * Fill in these boxes and read what is printed below. Full name of centre Town Forename(s) Surname Number of seat ate of birth ay Month Year Scottish candidate number Instructions for the completion of Paper 1 are given on page 02. Record your answers on the answer grid on page 03. Use blue or black ink. efore leaving the examination room you must give your answer booklet to the Invigilator; if you do not, you may lose all the marks for this paper. *S *

17 Paper 1 25 marks The questions for Paper 1 are contained in the question paper S813/76/12. Read these and record your answers on the answer grid on page 03. Use blue or black ink. o NT use gel pens or pencil. 1. The answer to each question is either,, or. ecide what your answer is, then fill in the appropriate bubble (see sample question below). 2. There is only one correct answer to each question. 3. ny rough working should be done on the space for rough work at the end of the question paper S813/76/12. Sample question To show that the ink in a ball-pen consists of a mixture of dyes, the method of separation would be: fractional distillation chromatography fractional crystallisation filtration. The correct answer is chromatography. The answer bubble has been clearly filled in (see below). hanging an answer If you decide to change your answer, cancel your first answer by putting a cross through it (see below) and fill in the answer you want. The answer below has been changed to. If you then decide to change back to an answer you have already scored out, put a tick (3) to the right of the answer you want, as shown below: or *S * page 02

18 Paper 1 nswer grid *J251* *S * page 03

19 SPEIMEN S813/76/12 National Quali cations NLY hemistry Paper 1 Multiple choice Marking Instructions These marking instructions have been provided to show how SQ would mark this specimen question paper. The information in this publication may be reproduced to support SQ qualifications only on a non-commercial basis. If it is reproduced, SQ should be clearly acknowledged as the source. If it is to be used for any other purpose, written permission must be obtained from permissions@sqa.org.uk. Where the publication includes materials from sources other than SQ (ie secondary copyright), this material should only be reproduced for the purposes of examination or assessment. If it needs to be reproduced for any other purpose it is the user s responsibility to obtain the necessary copyright clearance.

20 Marking instructions for each question Question nswer Max mark [EN F SPEIMEN MRKING INSTRUTINS] page 02