give reason for the following:
a) soap is not effective in hard water
b) ethane and ethyne burn with a sooty flame.
c) Graphite is a good conductor of electricity.
d) Melting and boiling points of butane is higher than that of propane.
e) C3H6 and C4H8 have similar chemical properties
plz plz answer me
Answers
Answer:
A) Soap is not effective in hard water. Soap is made of sodium or potassium salts and hard water is made of calcium and magnesium salts.
When soap is added to water , the calcium and magnesium ions readily react wth the sodium and potassium salts and an insoluble scum is formed.
A lot of soap is wasted in this process.
B) Ethene and ethyne burn with a sooty flame because they are unsaturated hydrocarbons and also incomplete combustion takes place involving the formation of soot.
C) Graphite being a non- metal is a good conductor of electricity. It is an allotrope of carbon and all other allotropes of carbon are bad conductors. Graphite is a good conductor due to the rigid 4 - dimensional structure.
D) Melting point of butane is higher than propane because butane has 4 - carbon atoms linked together as compared to propane which has 3 - carbon atoms linked together. As a result , butane has higher melting and boiling point.
E)C3H6 AND C4H8 have similar chemical properties as they belong to the homologous series and in homologous series , all the compounds have similar chemical properties as they belong to the same functional group.
In homologous series all the compounds differ by same chemical formula of CH2 , and same atomic mass of 14u.
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