chem notes

chem notes - Differneces between carbon and silicon stem...

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1) Predict the products of the reaction of a certain binary hydride with water  2K(s) + H2(g)--> 2 KH(s) saline hydrides 2 Cu(s) + H2(g)---> 2 CuH(s) metallic hydrides 2) Know what superoxides and peroxides are  Peroxides have an O-O bond and O in the -1 oxidation state. Superoxides: have an O-O bond and O in an oxidation state of -1/2 (superoxide ion is O2-) -2Na + O2 --> Na_2O_2 which is a peroxide -K + O2 --> KO2 which is a super peroxide   3) Apply your knowledge to predict the relative stability of certain oxides  4) Explain why CO2 is different from SiO2 We will cover most of these topics in section before the quiz, but I  recommend reviewing lecture notes before section-
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Unformatted text preview: Differneces between carbon and silicon stem form the smaller atomic radius of carbon, which explains the C=C and the C=O double bonds however, it is rare to see Si=Si and Si=O. Silicon atoms are too large for the side-by-side overlap of p-orbitals necessary for pi-bonds to form between them. ex. O=C=O IS A GAS AND -O-Si-O- is a mineral. Silicon compounds can also act as Lewis acids, whereas carbon compounds typically cannot. Because silicon atoms are bigger than C atoms and can expand its valence shell by using its d-orbitals, it can accommodate the lone pair f an attacking Lewis base. Exception is when C atoms have multiple bonds. See you all soon! Alissa...
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