CHEMICAL EFFECTS OF ELECTRIC CURRENT

  Introduction:  When electric current is passed through conducting liquids, then chemical changes take place. This is called chemical effects of electric current. So, it is important that we should know some new terms like, electrolyte, electrode and electrolytic cell.

TERMS RELATED TO CHEMICAL EFFECTS OF ELECTRIC CURRENT:

  • Electrolyte: (chemical effects of electric current) It is a liquid which conducts is an electricity, e.g. a solution of copper sulphate salt in water is an electrolyte. The electrolyte contains ions and the flow of these ions (+ve or –ve) conducts electricity.(chemical effects of electric current)
  • Electrode: (chemical effects of electric current) It is a solid electrical conductor through which an electric current enters or leaves something like a dry cell or an electrolytic cell. (chemical effects of electric current) In other words, the carbon rods whose metal caps are covered by copper wires and joined to a battery are known as electrode.(chemical effects of electric current) Electrode are of two types: Cathode  and (chemical effects of electric current) Cathode is an electrode which is connected to negative terminal of the battery gets negatively charged. (chemical effects of electric current)Anode is an electrode which is connected to positive terminal of the battery gets positively charged.(chemical effects if electric current)
  • Electrolytic Cell: (chemical effects of electric current) It is an arrangement having two electrodes kept in a conducting liquid or electrolyte in a vessel, e.g if we keep two carbon electrodes in a baker containing acidified water, then it will be an electrolytic cell (chemical effects of electric current).
  • Electrolysis: (chemical effects of electric current) The chemical decomposition produced by passing an electric current through an electrolyte is called electrolysis, e.g. An acidified water decomposes into hydrogen and oxygen by passing an electric current over it ( chemical effects of electric current).
  • Electroplating: (chemical effects of electric current) It is one of the most common application of the chemical effects of electric current. The process of depositing a thin layer of desired metal object with the help of electric current is called electroplating. The objective of electroplating is to protect the metal objects from corrosion or rusting.(chemical effects of electric current).

 

PROBLEMS RELATED TO CHEMICAL EFFECTS OF ELECTRIC CURRENT:

Qs 1(chemical effect of electric current): It is dangerous to touch an electric appliance with wet hands, explain why( chemical effects of electric current).

Ans1( chemical effects of electric current): Since, wet hand acts as good conductor. So, we feel electric shock  when we touch electrical appliance with wet hands(chemical effects of  electric current).

Qs2 (chemical effects of electric current): Explain, why is layer of zinc coated over iron?(chemical effects of electric current)

Ans2 (chemical effects of electric current): Layer of zinc is coated over iron because zinc prevents it from rust and corrosion (chemical effects of electric current).

Qs3 (chemical effects of electric current): Mention any one important difference in the conduction of electricity by solids and liquid (chemical effects of electric current)

Ans3 (chemical effects of electric current): Since, no chemical changes take place when electricity is allowed to pass through the solids while in liquids chemical changes take place when electricity is pass through it.(chemical effects of electric current).

Qs4 (chemical effects of electric current): During the electrolysis of water at which electrode hydrogen gas is evolved ?(chemical effects of electric current).

Ans4 (chemical effects of electric current):  During the electrolysis of water, hydrogen gas is evolved at the cathode.(chemical effects of electric current)

Qs5 (chemical effects of electric current): Give the name of these substances which when added to the liquids make them good conductors of electricity.( chemical effects of electric current)

Ans5 (chemical effects of electric current): Acids, bases, salts are when added to the liquids then these become good conductors of electricity. (chemical effects of electric current)

Qs6 (chemical effects of electric current): sometimes we see the liquid is conducting but the bulb may not glow, why?(chemical effects of electric current).

Ans6 (chemical effects of electric current): The bulb does not glow because the current flowing through it is very weak. (chemical effects of electric current).

Qs7 (chemical effects of electric current): Will the solution of sugar in distilled water conduct electricity? (chemical effects of electricity)

Ans7 (chemical effects of electric current): The sugar solution in distilled water will make it a good conductor of electricity and current can easily pass through it.( chemical effects of electric current).

Qs8 (chemical effects of electric current): Mention three effects of electric current. (chemical effects of electric current)

             Ans8 (chemical effects of electric current):  

  • Heating effects of electric current
  • Magnetic effects of electric current
  • Chemical effects of electric current

Qs9 (chemical effects of electric current)Name the effect of current responsible for the glow of bulb in an electric circuit. (chemical effects of electric current).

Ans9 (chemical effects of electric current): Heating effect of electric current is responsible for the bulb to glow in an electric circuit. (chemical effects of electric current).

Qs10 (chemical effects of electric current): When a compass needle is brought near a current carrying wire, then what happens? (chemical effects of electric current)

Ans10 (chemical effects of electric current): When a compass needle is brought near a current carrying wire, then needles deflects. (chemical effects of electric current)

Qs11 (chemical effects of electric current): Mention whether the distilled water conducts the electricity or not. (chemical effects of electric current).

Ans11 (chemical effects of electric current) : The distilled water does not conduct electricity. (chemical effects of electric current).

Qs12 (chemical effects of electric current): Since, when an electric current is passed through two solutions A and B, the bulb glows brightly for solution b and dimly for solution A. so, which of these two is a better conductor? (chemical effects of electric current)

Ans12 (chemical effects of electric current): Solution B is a better conductor. (chemical effects of electric current)

Qs13 (chemical effects of electric current) : Mention the name of three liquids which can conduct electricity? (chemical effects of electric current)

Ans13 (chemical effects of electric current): Name of the liquids are

  • Tap water
  • Lemon juice or citric acid
  • Vinegar or acetic acid (chemical effects of electric current)

Qs14 (chemical effects of electric current): Explain, how can we check that liquids conduct electricity/ (chemical effects of electric current)

Ans14 (chemical effects of electric current): We can use the device ELECTRIC TESTER for checking of conduction of electricity through the given liquids. (chemical effects of electric current)

Qs15 (chemical effects of electric current): Explain the magnetic effects of electric current> (chemical effects of electric current)

Ans15 (chemical effects of electric current): The electric current produces the magnetic field under which a current carrying wire behaves like a magnet. (chemical effects of electric current)

Qs16 (chemical effects of electric current): A chemical compound is produced by the method of electrolysis. Give an example.( chemical effects of electric current)

Ans16 (chemical effects of electric current): Solution of sodium hydroxide (NaOH) or caustic soa is produced by the electrolysis of an aqueous solution of sodium chloride (NaCl) (chemical effects of electric current)

Qs17 (chemical effects of electric current) Mention the place where should we dispose the waste electrolytes in electroplating? (chemical effects of electric current)

Ans17 (chemical effects of electric current) We should dispose the waste electrolytes far away from residential area. (chemical effects of electric current).

Qs18 (chemical effects of electric current) The fresh fruits and vegetables conduct electricity to some extent. Explain why? (chemical effects of electric current)

Ans18 (chemical effects of electric current): Fruits  and vegetables are able to conduct electricity to some extent due to the presence of various salt solution in vegetables and acid in fruits. (chemical effects of electris current)

Qs19 (chemical effects of electric current): Which one is better conductor of electricity: sea water or  drinking water? (chemical effects of electric current)

Ans19 (chemical effects of electric current): sea water is better conductor than drinking water as sea water contains more salt which increases conductivity. (chemical effects of electric current).

Qs20 (chemical effects of electric current) Why is tin electroplated on iron to make cans used for storing  food?(chemical effects of electric current)

Ans20 (chemical effects of electric current): Electroplating is done on the iron to prevent it from rust and corrosion and it is cheap (chemical effects of electric current)

Qs21 (chemical effects of electric current): Name some substances with example which make a liquid good conductor.(chemical effects of electric current)

Ans21 (chemical effects of electric current) substances making a liquid good conductor are:

  • Acids (H2SO4 / HNO3 / HCl)
  • Bases {NaOH / NH4OH / Ca (OH)2}
  • Salts ( NaCl /ZnCl2 / (NH4)2SO4) (chemical effects of electric current)

Qs22 (chemical effects of electric current) :What is LED? (chemical effects of electric current)

Ans22 (chemical effects of electric current)  LED is a devic or bulb which glows even at low or small current (chemical effects of electric current).

 Qs23 (chemical effects of electric current) : Which form of energy conversion takes place in electric cell? (chemical effects of electric current)

Ans23 (chemical effects of electric current): In electric  dry cell or battery, electric energy comes from  chemical energy. (chemical effects of electric current)

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