Short Answer TypeWrite chemical equation of the reaction of ethanoic acid with the following:
a) Sodium
b) Sodium hydroxide
c) Ethanol
An aldehyde, as well as ketone, can be represented by the same molecular formula say C3H6O, Write their structures and name them. State the relation between the two in the language of science.
What was Chipko Andolan? How did the Andolan ultimately benefit the local people and the environment?
An element 'X' belongs to 3rd period and group 16 of the Modern periodic table.
a) Determine the number of valence electrons and the valency of 'X'
b) Molecular formula of the compound when 'X' reacts with hydrogen and write its electron dot structure.
c) Name the element 'X' and state whether it is metallic or non-metallic.
Burning of fossil fuels results in global warming. Give reasons to justify this statement.
An element 'X' has mass number 35 and a number of neutrons 18. Write atomic number and electronic configuration of 'X'.Also write group number,period number and valency of 'X'
A carbon compound 'P' on heating with excess conc. H2SO4 forms another carbon compound 'Q' which on the addition of hydrogen in the presence of nickel catalyst forms a saturated carbon compound'R'. One molecule of 'R' on combustion forms two molecules of carbon dioxide and three molecules of water. Identify p,Q and R and write chemical equations for the reactions involved.
Define reproduction. How does it help in providing stability to the population of species?
Reproduction is the biological process by which new individual organisms – 'offspring' – are produced from their 'parents'. It is a ( biological) process by which new individuals of the same species are produced by the existing organisms.
Reproduction is the only means to ensure the continuity of a species. By reproduction, organisms produce a large number of new individuals out of which several get perished and only some survive. These surviving organisms replace the naturally dying members of the population. Hence the population as a whole is not affected and remains stable. Moreover, in certain modes of reproduction like the sexual mode variations are incorporated which help the species to adapt better to the environment and results in evolution too.
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