12. Given the following equation, write the net ionic equation and indicate circ
ID: 1042185 • Letter: 1
Question
12. Given the following equation, write the net ionic equation and indicate circle the spectator ions 13. Look up the structure for Polyethylene, draw a portion of it and explain why it is unreactive. 14. Using glucose as an example of an aldehyde that is a sugar that would give a positive result when test for reducing sugar is done with Benedict's solution, show the reaction using structures and provide names for them. Will starch give a similar result? Explain. 15. Answer the following: Benzene can be represented by a hexagon with a circle inside. What is the significance of this circle inside the hexagon structure? a. b. Why are substitution reactions more likely to occur with benzene rather than addition reactions? c. Which lab test proves that benzene derivatives do not react like a typical alkene?Explanation / Answer
12.
Molecular equation:
2 AgNO3 (aq.) + K2SO4 (aq.) ------------> Ag2SO4 (s) + 2 KNO3 (aq.)
Complete ionic equation:
2 Ag+ (aq.) + 2 NO3- (aq.) + 2 K+ (aq.) + SO42- (aq.) ------> Ag2SO4 (s) + 2 K+ (aq.) + 2 NO3- (aq.)
Spectator ions are : NO3- and K+
Net ionic equation:
2 Ag+ (aq.) + SO42- (aq.) -----------> Ag2SO4 (s)
13.
Polyethylene:
-CH2-CH2-CH2-CH2-CH2-CH2-CH2-CH2-
There is no active site to get it destroyed and hence is unreaction.
14.
HOCH2CHOHCHOHCHOHCHOHCHO + CuO ( from bendicts) ----> HOCH2CHOHCHOHCHOHCHOHCOO- (aq.) + Cu2O (red precipitate)
Starch is a polysaccharide and polysaccharides donot give positive Benedicts test.
15.
(a) The circle inside the benzene ring signifies the delocalisation of 3 pi bond electrons.
(b) Because of its resonance stabilisation the pi bond electrons are not ready to undergo addition reaction and hence they undergo substitution reactions like saturated compounds.
(c) Bromine test. Benzene does not decolurise the bromine water like alkene do.
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