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Unit 2 Polymers

Unit 2 Polymers. Go to question. 1. 2. 3. 4. 5. 6. 7. 8. 1. A monomer used to make Kevlar is shown opposite. What is the percentage of carbon by mass, in this monomer?. a. 50.1 %. b. 57.8%. c. 44.4 %. d. 80.0%. a hint!!!!. 1 st hint What is the molecular formula?.

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Unit 2 Polymers

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  1. Unit 2 Polymers

  2. Go to question 1 2 3 4 5 6 7 8

  3. 1 A monomer used to make Kevlar is shown opposite. What is the percentage of carbon by mass, in this monomer? a. 50.1 % b. 57.8% c. 44.4 % d. 80.0%

  4. a hint!!!! 1st hint What is the molecular formula?. 2st hint What is GFM of this compound? 3rd hint What is the mass of carbon?

  5. A monomer used to make Kevlar is shown opposite. What is the percentage of carbon by mass, in this monomer? Correct because…………. It’s molecular formula is C8H6O4. Therefore (8x12)+(6x1)+(4x16) = formula mass mass of Carbon % mass of Carbon = Formula mass = (60/166) x 100 = 57.8%

  6. 2 The diagram shows part a polyester polymer. Name the two monomers used to make this polymer. a. 1,6-hexandiol and 1,6-hexandioic acid b. 1,6-hexandiol and hexanyl hexanoate c. 1,6-hexandioic acid and hexanyl hexanoate d. Hexanol and hexanoic acid

  7. a hint!!!! A polyester is made from 2 monomers, a diol and a diacid.

  8. The diagram shows part of a polyester. Name the two monomers used to make this polymer. 1,6-hexandioic acid 1,6-hexandiol Correct because………….. A polyester is made from a diol and a diacid. 1,6-hexandioland 1,6-hexandioic acid

  9. The diagram show 2 amino acids joined together.When this molecule is hydrolysed which bond breaks? 3 a. C - C C = C b. c. C - N C - H d.

  10. O H C H Peptide link a hint!!!! 1st hint Look at the peptide link 2nd hint The peptide link looks like

  11. R H O H N C C O H H The diagram show 2 amino acids joined together.When this molecule is hydrolysed which bond breaks? Correct because…………. The peptide (amide) bond breaks. This means that the C—N bond breaks during hydrolysis. C - N Amino acid

  12. 4 The monomer that gives rise to this polymer is? a. 1,2, dimethylpropene b. 3,methylhepta-3,4-diene c. hexa-3-ene d. 2,3-dimethylbut-2-ene

  13. a hint!!!! 1,2, dimethylpropene

  14. a hint!!!! 3,methylhepta-3,4-diene

  15. a hint!!!! 2,3-dimethylbut-2-ene

  16. The monomer that gives rise to this polymer is? Correct because……. Hexa-3-ene the repeating unit in this polymer chain is The longest chain of this monomer has 6 carbons. It also requires a double bond.

  17. 5 Which polymer can dissolve in water? a. polystyrene b. poly(ethenol) c. polyamide, nylon 6,6 d. polytetrafluoroethene

  18. a hint!!!! Polystyrene is an excellent insulator and can be used for drink Cups.

  19. a hint!!!! Nylon is an excellent fibre which is used for clothing

  20. a hint!!!! Another name for this polymer is teflon!

  21. CH3 CH3 H O H C O C O O O O CH CH CH CH CH2 CH2 CH2 CH2 Which polymer can dissolve in water? Correct because…….. Poly(ethenol) is a polymer made from the reaction between a polymer called poly(ethenyl ethanoate) and methanol. Ester exchange + methanol Polyethenol (polyvinyl alcohol) Polyethenyl ethanoate

  22. 6 The graph shows an enzymes activity with increasing temperature. Which statement best describes what is happening? Activity Temperature a. The enzyme’s activity increases with temperature b. The enzyme’s activity is slowed down after a certain temperature. This effect is reversible. c. The enzyme’s activity is works best at an optimum temperature. d. The enzyme’s activity is increased after a certain temperature. This effect is irreversible.

  23. a hint!!!! Does the graph show that this is always true.

  24. a hint!!!! After a certain temperature the enzyme shape changes permanently.

  25. The graph shows an enzymes activity with increasing temperature. Which statement best describes what is happening? Correct because …….. The enzyme’s activity is works best at an optimum temperature. Enzymes are biological catalysts. Their activity increases with temperature until an optimum temperature is reached. If it gets too hot the Enzyme denatures, its shape changes permanently. Activity Temperature

  26. 7 Bakelite is a thermosetting plastic. Its properties are due to? a. The aromatic nature of its structure. b. Cross-linking covalent bonding c. Hydrogen bonding between the polymer chains d.The number of carbon/carbon double bonds

  27. a hint!!!! Bakelite is a rigid, hard and fairly brittle plastic. What must be true about the polymer chains.

  28. a hint!!!! Look at the cross-linking in the structure of bakelite!

  29. Bakelite is a thermosetting plastic. Its properties are due to? Correct because …. Bakelite is a thermosetting plastic. It is made by heating phenol and methanal, to form a network which is cross-linked by strong covalent bonding Cross linking

  30. Ethene is used as the building block of many polymers. What is the name given to the process by which ethene is made into polythene? 8 a. Condensation polymerisation b. Hydrogenation c. Oxidation d. Addition polymerisation

  31. a hint!!!! Making polythene only uses one monomer.

  32. a hint!!!! This process adds hydrogen across a C=C bond.

  33. a hint!!!! This involves the addition of oxygen.

  34. Ethene is used as the building block of many polymers. What is the name given to the process by which ethene is made into polythene? Correct because…. Poly(ethene) is formed from ethene in an addition polymerisation. n C2H4 (C2H4 ) addition n polymerisation n = a large number

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