continue framework silicates examples

Question 1

What are silicone polymers based on?

Answer 1

on the Si-O backbone

Question 2

what are silicone polymers formed from?

Answer 2

Ch3Cl and Si/Cu followed by hydrolysis

Question 3

what are the properties of long chain silicone polymers?

Answer 3

unreactive, viscous, oily liquids with low surface tension

Question 4

what are long chain silicone polymers used for?

Answer 4

hydraulic oils, lubricantm anit-foaming agents, digestive aids, makeup, etc…

Question 5

what must be hydrolysed to give ELASTOMERS

Answer 5

(CH3)SiCl3

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Question 6

what are the properties of elastomers

Answer 6

stable, flexible over a wide temperature range

Question 7

What happens during the making of pottery?

Answer 7

1. ) on heating clay at low T, the excess water is expelled first
2. ) at higher T, irreversible chemical change takes place
3. ) the fired ceramic is a mixture of two phases MULLITE and SILICA

Question 8

what is the equation of the irreversible chemical change that occurs during pottery making?

Answer 8

3 Al2Si2O5(OH)4 —>Al6Si2O13 +4SiO2 +6H2O

Question 9

what kind of needles does mullite form?

Answer 9

needle-like crystals, that interpenetrate and confer strength to the ceramic

Question 10

what kind of solids are glass

Answer 10

amorphous

Question 11

what is “normal glass”

Answer 11

soda-lime glass

Question 12

how is soda lime glass made: equation

Answer 12

Na2CO3 + nSiO2 +CaO —> Na2O.CaO.(SiO2)6 +CO2

Question 13

how much % does soda glass account for that is made?

Answer 13

90%

Question 14

what is are the units of soda glass

Answer 14

linked SiO2 units
3dimensional network
with Na+ and Ca2+ balancing the charge