d. Which name best fit for these Natural Materials Wood- Rubber-Cotton-Wool-Leat
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d. Which name best fit for these Natural Materials Wood- Rubber-Cotton-Wool-Leather - Silk 33. The bonds between the hydrocarbon molecules are covalent a) False 34.Double & triple bonds are somew hat unstable-involve sharing 2 or 3 pairs of electrons, respeet can also form new bonds Double bond found in ethylene C2H4 a) False b) True H-C C-H 35. Mateh the correcet no. to the shapes letter below 1 -Linear, 2- Cross Linked, 3- Network, 4 - Branched 36. What is the group name for the shapes below 37. The response of a polymer to mechanical forces at elevated temperature is not related to its dominant molecular structure. a) False b) True 38. One classification of polymers is according to its behavior and rising temperature. Thermoplasties and Thermosets are the 2 categories. a) False b) TrueExplanation / Answer
33) True, Most of the compounds in crude oil are hydrocarbons. This means they only contain hydrogen and carbon atoms, joined together by covalent bonds. Remember that a covalent bond is a shared pair of electrons.
37) False, The response of a polymer to molecular forces at elevated temperatures is related to its dominant molecular structure.Infact, one classification scheme for these materials is according to behaviour with rising temperature.
38) False
40) The most important mechanical properties of poly mer are:
low density polyethylene, crosslinked polyethylene, polypropylene,Ethylene-propylene, polymethyl pentene, styrene-buta diene, High-impact polystyrene
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