66-69.

Chemistry
Tutor: None Selected Time limit: 1 Day

May 22nd, 2015

66) plastics

67)propylene radical is the repeating sub unit.

68) Carbon has 4 valence electrons and they can form 4 bonds.

69) charcoal, graphite and diamond.

May 22nd, 2015

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May 22nd, 2015
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May 22nd, 2015
Dec 5th, 2016
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