20.1. Addition polymerisation
A subsection of Chemistry, 9701, through 20. Polymerisation
Listing 10 of 116 questions
Methyl 2-cyanoprop-2-enoate, W, is the major component of Super Glue, a rapid-setting adhesive. As the adhesive sets, the monomer W polymerises. C CN OCH3 C W O H2C Draw a section of the polymer showing two repeat units.  Name the type of polymerisation occurring. Suggest two types of intermolecular force that could occur between the Super Glue polymer and the objects glued together. For each type of intermolecular force, refer to the atoms/groups in the SuperGlue polymer involved in the attraction. type of intermolecular force atoms/groups in the Super Glue polymer  W can be synthesised in three steps, starting from 2-oxopropanoic acid, X. CH3 O C OH C O X step 1 step 2 step 3 Y (C4H6O3) Z C CN OCH3 C W O H2C Suggest the identities of compounds Y and Z by drawing their structures in the boxes.  Suggest suitable reagents and conditions for each of the steps 1–3. step 1 step 2 step 3  
9701_m19_qp_42
THEORY
2019
Paper 4, Variant 2
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In a protein, amino acids are joined together by a process called condensation polymerisation. Addition polymerisation is used in some synthetic polymers, such as poly. State two important differences between condensation polymerisation and addition polymerisation. Using the amino acids glycine and alanine shown, draw the displayed formula of the dipeptide ala-gly, clearly labelling the peptide link. CO2H C H glycine H H2N CO2H C CH3 alanine H H2N The diagram below shows a section of DNA. Identify the blocks labelled X, Y and Z. X X A Z X X C G Y Y X X C G Y Y Y Y X Y Z Examiner’s Use The table below shows the 3-base codes used by RNA. UUU UUC UUA UUG phe phe leu leu UCU UCC UCA UCG ser ser ser ser UAU UAC UAA UAG tyr tyr stop stop UGU UGC UGA UGG cys cys stop trp CUU CUC CUA CUG leu leu leu leu CCU CCC CCA CCG pro pro pro pro CAU CAC CAA CAG his his gln gln CGU CGC CGA CGG arg arg arg arg AUU AUC AUA AUG ile ile ile met/ start ACU ACC ACA ACG thr thr thr thr AAU AAC AAA AAG asn asn lys lys AGU AGC AGA AGG ser ser arg arg GUU GUC GUA GUG val val val val GCU GCC GCA GCG ala ala ala ala GAU GAC GAA GAG asp asp glu glu GGU GGC GGA GGG gly gly gly gly What amino acid sequence would the following base code produce? (You may use abbreviations in your answer.) -AUGUCUAGAGACGGGUAA- What would be the effect on the amino acid sequence if a mutation caused the base G at position 13 in the sequence to be replaced by U? Name a disease which results from a genetic defect. Explain how the genetic defect can bring about your named disease.
9701_s07_qp_4
THEORY
2007
Paper 4, Variant 0
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