*0500/402* 0500/402. CHEMISTRY STANDARD GRADE Credit Level. Fill in these boxes and read what is printed below. Full name of centre

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1 FOR OFFIIL USE 0500/402 NTIONL QULIFITIONS 2009 MONDY, MY 0.50 M 2.20 PM Total HEMISTRY STNDRD GRDE redit Level Fill in these boxes and read what is printed below. Full name of centre Town Forename(s) Surname Date of birth Day Month Year Scottish candidate number Number of seat ll questions should be attempted. 2 Necessary data will be found in the Data ooklet provided for hemistry at Standard Grade and Intermediate 2. 3 The questions may be answered in any order but all answers are to be written in this answer book, and must be written clearly and legibly in ink. 4 Rough work, if any should be necessary, as well as the fair copy, is to be written in this book. Rough work should be scored through when the fair copy has been written. 5 dditional space for answers and rough work will be found at the end of the book. 6 The size of the space provided for an answer should not be taken as an indication of how much to write. It is not necessary to use all the space. 7 efore leaving the examination room you must give this book to the invigilator. If you do not, you may lose all the marks for this paper. S 0500/402 6/24620 *0500/402*

2 PRT In Questions to 8 of this part of the paper, an answer is given by circling the appropriate letter (or letters) in the answer grid provided. In some questions, two letters are required for full marks. If more than the correct number of answers is given, marks will be deducted. total of 20 marks is available in this part of the paper. SMPLE QUESTION H 4 H 2 O 2 O 2 H 5 OH (a) Identify the hydrocarbon. The one correct answer to part (a) is. This should be circled. (b) Identify the two elements. s indicated in this question, there are two correct answers to part (b). These are and F. oth answers are circled. If, after you have recorded your answer, you decide that you have made an error and wish to make a change, you should cancel the original answer and circle the answer you now consider to be correct. Thus, in part (a), if you want to change an answer to an answer D, your answer sheet would look like this: If you want to change back to an answer which has already been scored out, you should enter a tick ( ) in the box of the answer of your choice, thus: Page two

3 . Many solutions are used for chemical tests. enedict s reagent lime water bromine solution ph indicator iodine solution ferroxyl indicator (a) Identify the solution which could be used to test for maltose. (b) Identify the solution which is used to test for Fe 2+ (aq). (2) [Turn over Page three

4 2. Many chemical compounds contain ions. strontium chloride lithium oxide calcium oxide barium fluoride sodium fluoride potassium chloride (a) Identify the compound which produces a green flame colour. You may wish to use the data booklet to help you. (b) Identify the compound in which both ions have the same electron arrangement as argon. (2) Page four

5 3. The table contains information about some substances. onducts as Substance Melting point/ oiling point/ a solid a liquid yes yes no no 59 2 no no D no yes E yes yes (a) Identify the substance which exists as a covalent network. D E (b) Identify the substance which could be calcium fluoride. D E (2) [Turn over Page five

6 4. The grid shows the names of some ionic compounds. aluminium bromide sodium chloride potassium hydroxide sodium sulphate potassium bromide calcium chloride (a) Identify the base. (b) Identify the two compounds whose solutions would form a precipitate when mixed. You may wish to use the data booklet to help you. (c) Identify the compound with a formula of the type XY 2, where X is a metal. (3) Page six

7 5. The names of some hydrocarbons are shown in the grid. ethane pentene cyclohexane pentane cyclopentane propene (a) Identify the two isomers. (b) Identify the hydrocarbon with the highest boiling point. You may wish to use the data booklet to help you. (c) Identify the two hydrocarbons which can take part in an addition reaction with hydrogen. (3) [Turn over Page seven

8 6. Reactions can be represented using chemical equations. Fe 2+ (aq) + 2e Fe(s) Fe 2+ (aq) Fe 3+ (aq) + e 2H 2 (g) + O 2 (g) 2H 2 O(g) D 2H 2 O( ) + O 2 (g) + 4e 4OH (aq) E SO 2 (g) + H 2 O( ) 2H + (aq) + SO 2 3 (aq) (a) Identify the equation which shows the formation of acid rain. D E (b) Identify the equation which represents a combustion reaction. D E (c) Identify the two equations which are involved in the corrosion of iron. D E 2 (4) Page eight

9 7. The grid contains information about the particles found in atoms. relative mass = charge = zero relative mass almost zero found outside charge = the nucleus charge = + Identify the two terms which can be applied to protons. (2) [Turn over Page nine

10 8. The fractional distillation of crude oil was demonstrated to a class. thermometer test tubes to collect fractions heater crude oil Six fractions were numbered in the order they were collected. Fraction Fraction 2 Fraction 3 Fraction 4 Fraction 5 Fraction 6 ollected first ollected last Identify the two correct statements. Fraction 6 evaporates most easily. Fraction 5 is less viscous than fraction 4. Fraction 2 is more flammable than fraction 3. D Fraction has a lower boiling range than fraction 2. E The molecules in fraction 3 are larger than those in fraction 4. D E (2) Page ten

11 [Turn over for Part 2 on Page twelve Page eleven

12 PRT 2 total of 40 marks is available in this part of the paper. 9. There are three different types of neon atom. Type of atom Number of protons Number of neutrons 20 0 Ne 2 0 Ne 22 0 Ne (a) omplete the table to show the number of protons and neutrons in each type of neon atom. (b) What term is used to describe these different types of neon atom? (c) natural sample of neon has an average atomic mass of What is the mass number of the most common type of atom in the sample of neon? (3) Page twelve

13 0. luminium metal can be produced by passing electricity through molten aluminium oxide. power supply carbon electrodes molten aluminium oxide heat (a) Name this process. (b) Write the ionic formula for aluminium oxide. (c) Why do ionic compounds, like aluminium oxide, conduct electricity when molten? (3) [Turn over Page thirteen

14 . student burned gas X and the products were passed through the apparatus shown. to water pump gas X lime water ice test tube test tube (a) The results are shown in the table. Observation in test tube colourless liquid forms Observation in test tube lime water turns milky Using the information in the table, name two elements which must be present in gas X. (b) The experiment was repeated using hydrogen gas. omplete the table showing the results which would have been obtained. Observation in test tube Observation in test tube (2) Page fourteen

15 2. Hydrogen can form bonds with other elements. The diagram shows the arrangement of outer electrons in a molecule of hydrogen chloride. = outer electron H l (a) What type of bonding is present in a hydrogen chloride molecule? (b) Draw a similar diagram, showing all outer electrons, to represent a molecule of phosphine, PH 3. (2) [Turn over Page fifteen

16 3. The apparatus below was used to investigate the reaction between lumps of calcium carbonate and dilute hydrochloric acid. Excess acid was used to make sure all the calcium carbonate reacted. balance was used to measure the mass lost during the reaction. dilute hydrochloric acid calcium carbonate balance (a) Name the type of chemical reaction taking place when calcium carbonate reacts with dilute hydrochloric acid. (b) The results are shown in the table. Time/minutes Mass lost/g (i) Why is mass lost during the reaction? Page sixteen

17 3. (b) (continued) (ii) Draw a line graph of the results. Use appropriate scales to fill most of the graph paper. (dditional graph paper, if required, will be found on page 26.) 2 (c) The experiment was repeated using the same volume and concentration of acid. The same mass of calcium carbonate was used but powder instead of lumps. Suggest how much mass would have been lost after three minutes. g (5) [Turn over Page seventeen

18 4. (a) The flow diagram shows how ammonia is converted to nitric acid. ammonia X reactor nitrogen dioxide absorber air air nitric acid HNO 3 (i) Name the industrial process used to manufacture nitric acid. (ii) The reactor contains a platinum catalyst. Why is it not necessary to continue heating the catalyst once the reaction has started? (iii) Name substance X. (b) mmonia and nitric acid react together to form ammonium nitrate, NH 4 NO 3. alculate the percentage by mass of nitrogen in ammonium nitrate. Show your working clearly. % 2 (5) Page eighteen

19 5. student carried out some experiments with four metals and their oxides. The results are shown in the table. Metal Reaction with cold water Reaction with dilute acid Effect of heat on metal oxide W no reaction no reaction no reaction X no reaction gas produced no reaction Y gas produced gas produced no reaction Z no reaction no reaction metal produced (a) Place the four metals in order of reactivity (most reactive first). (b) Name the gas produced when metal Y reacts with cold water. (c) Suggest names for metals Y and Z. metal Y metal Z (3) [Turn over Page nineteen

20 6. The diagram shows the main stages in the making of malt whisky. hot water starch (in barley) reactor glucose carbon dioxide fermentation yeast alcohol (8%) process X malt whisky (40% alcohol) (a) Name the type of chemical reaction which takes place in the reactor. Page twenty

21 6. (continued) (b) The equation for the reaction taking place during fermentation is: 6 H 2 O 6 2 H 5 OH + O 2 alance this equation. (c) What name is given to process X? (d) Ethanol, 2 H 5 OH, is the alcohol found in whisky. bottle of whisky contains 230 g of ethanol. alculate the number of moles of ethanol present in the whisky. Show your working clearly. mol 2 (5) [Turn over Page twenty-one

22 7. student set up the cell shown. ammeter electrode X ion bridge electrode Y solution containing bromine solution containing iodide ions The reaction taking place at electrode Y is: 2I (aq) I 2 (s) + 2e (a) Name the type of chemical reaction taking place at electrode Y. (b) On the diagram, clearly mark the path and direction of the electron flow. (c) Describe a test, including the result, which would show that iodine had formed at electrode Y. (d) Write the ion-electron equation for the chemical reaction taking place at electrode X. (4) Page twenty-two

23 8. When superglue sets, a polymer is formed. Part of the polymer structure is shown. (a) Draw the structure of the repeating unit in the superglue polymer. (b) The polymer shown above contains methyl groups (H 3 ). nother type of superglue, used to close cuts, has the methyl groups replaced by either butyl groups ( 4 H 9 ) or octyl groups. omplete the table to show the number of carbon and hydrogen atoms in an octyl group. Number of atoms Group arbon Hydrogen methyl 3 butyl 4 9 octyl (c) Name a toxic gas given off when superglue burns. (3) [Turn over Page twenty-three

24 9. (a) The table gives information about some members of the alkane family. Name Molecular formula oiling point/ nonane 9 H 20 5 decane 0 H undecane H dodecane 2 H 26 Predict the boiling point of dodecane. (b) What term is used to describe any family of compounds, like the alkanes, which have the same general formula and similar chemical properties? (c) The equation for the burning of nonane is: 9 H O 2 9O 2 + 0H 2 O alculate the mass of water produced when 6. 4 grams of nonane is burned. Show your working clearly. g 2 Page twenty-four

25 9. (continued) (d) lkanes can be prepared by the Kolbé synthesis. ethanoate ions ethane Draw a structural formula for the alkane produced when propanoate ions are used instead of ethanoate ions. - (5) [END OF QUESTION PPER] Page twenty-five

26 DDITIONL SPE FOR NSWERS DDITIONL GRPH PPER FOR QUESTION 3(b)(ii) Page twenty-six

27 DDITIONL SPE FOR NSWERS Page twenty-seven

28 [LNK PGE]

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