1 The repeat unit for poly(propenamide) is H H H O N C C C N C C C H H NH 2. (Total for Question = 1 mark) PhysicsAndMathsTutor.
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1 1 The repeat unit for poly(propenamide) is 2 2
2 2 The structures of three amino acids are shown in the table. mino acid cysteine glycine threonine Structure S 2 ( 2 ) ()( 2 ) The tripeptide glycine-cysteine-threonine is 2 2 (() 3 )( 2 S) 2 2 ( 2 S)(() 3 ) 2 (() 3 )( 3 S) 2 2 ( 2 S) 2 (() 3 ) 3 The amino acid alanine, 2 ( 3 ), exists as a solid at room temperature. The most important reason for this is that it exists as a zwitterion. forms hydrogen bonds. is amphoteric. has strong London forces.
3 4 The skeletal formula of an organic compound is shown below. This compound is an amino acid. an amide. a primary amine. a secondary amine.
4 5 In an aqueous solution with a p of 7, the amino acid alanine exists mainly as
5 6 Excess dilute sulfuric acid is added to phenylamine. What is the product of the reaction? S 2 S S S
6 7 utylamine (T b = 77.8) has a higher boiling temperature than propylamine (T b = 47.7). This is because the hydrogen bonds of butylamine are stronger than the hydrogen bonds of propylamine. London forces of butylamine are stronger than the hydrogen bonds of propylamine. London forces of butylamine are stronger than the London forces of propylamine. bonds of butylamine are stronger than the bonds of propylamine.
7 8 The monomer of the addition polymer poly(propenamide) is 2 = 2. The repeat unit of the polymer is
8 9 In an aqueous solution with a p of 12, the amino acid alanine exists mainly as
9 10
10 11 12
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13 , you could use l a (Total for Question 1 mark) 17 enzocaine is used as a local anaesthetic Separate samples of a solution of benzocaine are added to 2,4-dinitrophenylhydrazine, hot aqueous sodium hydroxide, and dilute hydrochloric acid. Which chemicals react with benzocaine? ll three nly sodium hydroxide and hydrochloric acid nly hydrochloric acid nly sodium hydroxide (Total for Question 1 mark)
14 18 Four polymers labelled to have the following formulae: ( 2) 4 ( 2 ) 6 n n 3 3 n 3 3 n (a) Which polymer is most soluble in hot water? (1)
15 (b) Which polymer is formed from the monomer shown below? (1) (c) Which polymer is a condensation polymer? (1) (Total for Question 3 marks)
16 19 mmonia ( 3 ), butylamine ( ) and phenylamine ( ) all form alkaline solutions in water. The order of increasing p of equimolar solutions is < < 3 3 < < < 3 < < 3 < (Total for Question 1 mark) 20 mino acids are crystalline solids with a high melting temperature because each molecule has a large number of electrons. each molecule forms hydrogen bonds at both ends. a proton is transferred from one end of the molecule to the other. their shape allows the molecules to pack close together. (Total for Question 1 mark) 21 n organic compound X is much more soluble in dilute hydrochloric acid than in water. ompound X forms a coloured complex with aqueous copper(ii) ions. ompound X could be
17 22 1-butylamine, , reacts with ethanoyl chloride to form l ( 3 ) 2 23 Glycine, 2 2, is a solid that has a melting temperature of about 250, and it is very soluble in water. This is because of the formation of intermolecular hydrogen bonds in the solid and hydrogen bonds with water. formation of ions which interact strongly with each other in the solid and with water. dissociation of the molecule to form 2 2 and + ions in the solid and the solution. protonation of the molecule to form ions in both the solid and the solution.
18 24 Which of the following products is formed when phenylamine (aniline) is reacted with dilute sulfuric acid? 2 S S 4 2 S 3 (Total for Question 1 mark)
19 3 (Total for Question 1 mark) 25 n organic compound, X, shows the following properties: xidation of compound X produces a substance that reacts with 2,4-dinitrophenylhydrazine to give a yellow precipitate but does not react with Fehling s or enedict s solution. ompound X reacts with ice-cold nitrous acid to form a compound that gives a yellow precipitate with an alkaline solution of phenol. What is the formula of compound X? 2 ()
20 3 (Total for Question 1 mark) 26 The organic product of the reaction between ethanoyl chloride and methylamine has the formula 3 2 l 3 ( 2 ) l In the solid state, the amino acid serine exists in the form 3 + ( 2 ) 3 + ( 2 ) 2 2 ( 2 ) 2 ( 2 ) 2 (Total for Question 1 mark)
21 28 The best method for separating a mixture of amino acids in solution is distillation. solvent extraction. chromatography. recrystallization. (Total for Question 1 mark) 29 Which of these compounds will not form an amide in a reaction with ethanoyl chloride? ( 3 ) 3 2 ( 3 ) 2 (Total for Question 1 mark) 30 Which of the following reagents could be used to produce propanamide, 3 2 2? mmonia and 1-chloropropane mmonia and propanoyl chloride Methylamine and 1-chloropropane Methylamine and propanoyl chloride
Page 2. The tripeptide shown is formed from the amino acids alanine, threonine and lysine.
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