(i)With the addition of oxygen (O2) in the first equation, the sodium (Na) gets oxidised, and O2 is reduced. (ii) In the second equation CuO is reduced and hydrogen (H2) is oxidised.
A double displacement reaction can be seen between sodium chloride (NaCl) and silver nitrate (AgNO3). Due to the production of a white silver chloride precipitate, positive and negative ions exchange places during the reaction. The chemical reaction is given below. AgNO3 + NaCl → AgCl (ppt) + NaNO3
Because iron is more reactive than copper, it displaces copper from the copper sulphate solution when an iron nail is dipped in the solution. As a result, the copper sulphate solution’s colour changes. The result is Fe + CuSO4 → FeSO4 + Cu
Because water is hydrolyzed to release H2 and O2 gas in activity 1.7, the amount of gas collected in one test tube is double that of the other. Here, two molecules of hydrogen and one molecule of oxygen are released as a result of electrolysis; as a result, there will be twice as much hydrogen …
(i) The substance ‘X’ which is used in whitewashing is quick lime or Calcium Oxide (CaO). (ii) CaO + H2O → Ca(OH)2
(i) BaCl2 + Na2SO4 → BaSO4 + 2NaCl (ii) NaOH + HCl → NaCl + H2O
(i) H2 + Cl2 → 2HCl (ii) 3BaCl2 + Al2(SO4)3 →3BaSO4 + 2AlCl3 (iii) 2Na + 2H2O → 2NaOH + H2
Evolution is the sequence of gradual changes which take place in primitive organisms over millions of years in which new species are produced.Since there is no actual progress in the concept of evolution, the two concepts should not be linked. Simply put, evolution is the process of producing a variety of life forms and modifying …
The gradual change from simple to complex life forms, or from ancient organisms that lived millions of years ago to contemporary species, is known as evolution. Simple life forms undergo changes, improvements, and modifications during evolution. The remains or impressions of species that existed in the distant past are known as fossils. The existence of …
When animals or plants die, their remains are decomposed by microorganisms in the presence of oxygen, moisture, etc. The absence of oxygen, moisture, and other environmental factors can sometimes prevent the body of an organism from completely decaying. When we dig the earth, we find an organism’s body (or a part of its body) preserved …
