Question

Answer these questions

Answer 1

Explanation:

these are the answers to first 9 questions

Answer 2

Answer:

1. This is also the simplest type of reaction. A simple ion-combination reaction takes place when a solution of silver nitrate is mixed with a solution of sodium chloride. Both solutions are colorless and clear, but when one is added to the other, a white precipitate forms.

• 2. most metal carbonates decompose on heating to produce metal oxides and carbon dioxide gas metal carbonate⇒ metal oxide ⇒ + carbon dioxide example
• 3. When chlorine water is exposed to sunlight,it decomposes into HCl gas and oxygen. When chlorine water is exposed to strong sunlight it produces an odorless and colorless gas called oxygen.
• 4 Silver chloride turns dark when exposed to sunlight, generally it goes purplish then grey then black. This same reaction (or one like it) is used as the basis of photography. However most modern photography relies on the light producing a so called latent image then developing this latent image to get a visible one.
• 5. When copper (II) sulfate solution reacts with sodium hydroxide, a blue precipitate is formed. The equation for the reaction is: CuSO4 + 2NaOH -----> Cu(OH)2 + Na2(SO4) Cu(OH)2 is responsi...
• 6 When ammonia gas reacts with hydrogen chloride gas, it forms the salt ammonium chloride in gaseous state, but immediately it gets transformed into the solid state.
• 7. When heated in air, lead sulfide (PbS) combines with oxygen to form lead(II) oxide bO) and sulfur dioxide. Equation: PbS + O2 → PbO + SO2 Strong heating of red HgO in the test tube- it decomposes to liquid mercury and oxygen gas When H₂S is bubbled through solutions of oxidizing agents the purple colors of KMnO4 will be disappears
• 8. when ferrous sulphate crystals are heated it forms ferrous oxide ( Fe2o3) and sulpphur dioxide (SO2) and sulphur trioxide(SO3. when ferrous sulphate cryatals are heated it forms ferrous oxide ( Fe2o3) and sulpphur dioxide (SO2) and sulphur trioxide(SO32FeSO (s) heating----- Fe2O3 + SO2+SO3
• 9. Copper nitrate is a blue coloured crystal. When copper nitrate is heated it loses the water molecule and then when is further heated it decomposes to give reddish brown gas, nitrogen dioxide and oxygen. Cu (NO3)2.3H2O --heat--> Cu (NO3)2 + 3H2O 2Cu (NO3)2 --heat--> 2CuO + 4NO2 + O2
• 10. The chemical formula of sodium bicarbonate (washing soda) is Na2CO3.
• When it is heated it undergoes thermal decomposition reaction. This takes place above 500 degrees Celsius. The reaction of decomposition is
• Na2CO3 (s) = Na2O (s) + CO2 (g)
• The name of the first reaction product is sodium oxide which is solid and used in glass making and the name of the second products carbon dioxide gas resulting from all biological respiration processes.
• 12. When lead nitrate crystals are heated in a test tube, it decomposes into lead oxide, nitric oxide and oxygen. Thus, it is a decomposition reaction: 2 Pb(NO 3) 2 (s) → 2 PbO(s) + 4 NO 2 (g) + O 2 (g)
• 13. When dilute sulphuric acid is added to a mixture of iron fillings and sulphur powder heated to red hot followed by cooling , iron reacts with sulphur to form iron sulphide, FeS. FeS formed reacts with sulphuric acid to form ferrous sulphate and release hydrogendisulphide gas. Fe + S FeS FeS + H 2 SO 4 = FeSO 4 + H 2 S
• 14. When dilute sulphuric acid is added to barium chloride solution, barium sulphate is formed as a precipitate and hydrogen chloride is formed in aqueous solution.

Explanation:

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