A match does not ignite spontaneously with oxygen in the air because: O a) the reaction is endothermic. O b) the reaction of exothermic. O c) very few molecules have required sufficient activation energy. d) air is only 20% oxygen.

Which of the statement/s below is/are inaccurate? a. Crosslinked polymers are stronger and have lower elongation at break than branched and network polymers O b. Geometrical isomers include syndiotactic, atactic and isotactic types and only differ by their spatial repetition of side group positions. O c. Elastomers typically have higher elongation at break values than brittle and plastic polymers and they don't experience necking which plastic polymers do experience O d. The presence of bulky side groups and double bonds decreases the freedom of the polymer chain to rotate and change it's spatial configuration The higher the percent crystallinity the higher the strength and density, and the lower the permeability of the polymer e.

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A³ 7. Which of the following is NOT true of a collagen helix or collagen? a) A collagen helix cannot contain prolines. b) A collagen helix has a special amino acid called Hyp c) Collagen is a fibrous protein d) In collagen three helices come together to form a triple helix 8. Which of the following CANNOT make a H-bond. More than one can be circled. a) N-HO=C b) N…H-O-H Ⓒ)C=O....N-C (d))C=OH-O- 9. Which of the following statements describes an apoenzyme? a) the place where a substrate binds b) an apoenzyme is an organic molecule that an enzyme needs to function correctly can apoenzyme is an enzyme that does not have its cofactor and therefore is not functioning it describes a theory on how substrates and enzymes interact.