National 5 Chemistry
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1 National 5 Chemistry Relevant Past Paper Questions from SQA Standard Grade Credit and Intermediate 2 papers Problem Solving Questions March 204 Transforming lives through learning
2 N5 Chemistry Past Paper Questions The questions in this resource relate to Problem Solving for National 5 Chemistry and have been taken from the 20, 202 and 203 Standard Grade and Intermediate 2 Past Papers.
3 St Gr 20 Q2 (b) i & ii Problem Solving Not linked to any particular key area The table below shows the relationship between the percentage of ethanol and the density of alcoholic drinks. (a) Write a general statement describing how the percentage of ethanol affects the density of the alcoholic drink. (b) The density of a particular brand of alcoholic drink is g/cm 3. Predict the percentage of ethanol in this alcoholic drink. (a) As the percentage increases the density decreases As the percentage decreases the density increases Density increases as percentage decreases As the density increases percentage decreases eg wrong cause and effect Density decreases as percentage increases etc (b) 20
4 St Gr 202 Q7 (a) i & ii A solution of 0 mol/l hydrochloric acid has a ph of. (a) What colour would universal indicator turn when added to a solution of hydrochloric acid? (b) Starting at ph, draw a line to show how the ph of this acid changes when diluted with water. (a) Red, pink, orange, yellow (b) Line must be increasing Line stops at ph7 or below
5 St Gr 202 Q 8 A student investigated how the concentration of sodium chloride in water affected the freezing point. (a) What type of bond is broken in sodium chloride when it dissolves in water? (b) The table shows information about the freezing point of different sodium chloride solutions. Describe the relationship between the concentration and freezing point. (c) Predict the freezing point of a 0 55 mol/l sodium chloride solution. (a) Ionic Ionic lattice Ionic molecular Ionic network Lattice on its own Network on its own Sodium to chlorine bonds (b) As concentration increases/decreases freezing point decreases/increases The freezing point decreases/increases as concentration increases/decreases As concentration increases freezing point gets colder Wrong cause & effect eg: As freezing point decreases concentration increases. (c) -.8 to -2.0 inclusive Statement Less than -.5
6 Int 2 20 B Q9(d) A student investigated how the concentration of sodium chloride in water affected the freezing point. Using information in the passage above, calculate the volume of alcohol solution the tree shrew drinks each day. (a) 2 9 or 3 0 or 3 without working zero marks 2 96/2 9605/2 96/ on its own mark 3 0 or/3 with working
7 Int 2 20 B Q3 Some indicators can have different colours when in solutions of different ph values. The tables give information about two indicators, bromothymol blue and methyl orange. The ph of three solutions was investigated using both indicators. The results are shown below. (a) Which solution is alkaline? (b) Suggest a ph value for solution B. Answers Sample Answers and Mark Allocation Notes (a) (solution) C Last one/bottom one (b) any value above 4 4 and below 6 0 (not inclusive) must acknowledge both parameters number within range value below 6 0 value above 4 4
8 Int A Q5 The first four members of the amine homologous series are: What is the general formula for this homologous series? B
9 Int B Q9(a) Alkenes can undergo different reactions. In ozonolysis an alkene reacts with ozone forming two molecules. The ozonolysis of hex-3-ene is shown. Draw the products formed by the ozonolysis of hex-2-ene. Question Sample Answers and Mark Allocation Notes No 5 bonded carbons both required for mark allow one missing H or one missing C to H bond
National 5 Chemistry
National 5 Chemistry Identified Past Paper Questions from SQA Credit and Intermediate 2 papers Unit 3: Chemistry in Society and problem solving March 204 Transforming lives through learning Chemistry N5
National 5 Chemistry
National 5 Chemistry Identified Past Paper Questions from SQA Credit and Intermediate 2 papers Unit 3: Chemistry in Society and problem solving March 204 Transforming lives through learning Chemistry N5
National 5 Chemistry
National 5 Chemistry Relevant Past Paper Questions from SQA Standard Grade Credit and Intermediate 2 papers Unit : Chemical Changes and Structure March 204 Transforming lives through learning N5 Chemistry
National 5 Chemistry
National 5 Chemistry Identified Past Paper Questions from SQA Credit and Intermediate 2 papers Unit : Chemical Changes and Structure March 204 Transforming lives through learning Chemistry N5 Past Paper
National 5 Chemistry
National 5 Chemistry Identified Past Paper Questions from SQA Credit and Intermediate 2 papers Unit : Chemical Changes and Structure March 204 Transforming lives through learning Chemistry N5 Past Paper
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National 5 Chemistry
National 5 Chemistry Identified Past Paper Questions from SQA Credit and Intermediate 2 papers Unit 2: Nature s Chemistry March 204 Transforming lives through learning Chemistry N5 Past Paper Questions
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