In the circuit given in the figure, Boojho observed that copper is deposited on the electrode connected to the negative terminal of the battery. Paheli tried to repeat the same experiment. But she could find only one copper plate. Therefore, she took a carbon rod as negative electrode. Will copper be still deposited on the carbon rod? Explain your answer.
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Yes, If Paheli uses a Carbon rod as an electrode connected to the negative terminal of the battery, then copper sulphate solution dissociates into copper and sulphate ions on passing the current. The free copper ions start getting drawn to the carbon rod as it is connected to the negative terminal of the battery. Thus, she will find the carbon rod coated with copper.
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- The process that you saw in Activity 14.7 is used for the purification of copper. A thin plate of pure copper and a thick rod of impure copper are used as electrodes. Copper from an impure rod is sought to be transferred to the thin copper plate. Which electrode should be attached to the positive terminal of the battery and why?"
- Paheli wants to deposit silver on an iron spoon. She took silver nitrate $(AgNO_3)$ solution in a beaker and set up a simple circuit for electroplating. Which terminal of the battery should the spoon be connected to? What material should the other electrode be made of?
- A copper plate was dipped in AgNO3 solution. After certain time, silver from the solution was deposited on the copper plate. State the reason why it happened. Give the chemical equation of the reaction involved.
- Acidified water is electrolyzed by using carbon electrodes. What is produced at: (a) positive carbon electrode? (b) negative carbon electrode?
- For the electroplating of silver on a copper spoon, which electrode is chosen for silver and which one for copper? Also, give the name of the electrolyte required for the process.
- Fill in the blanks.$(a)$. Most liquids that conduct electricity are solutions of , ________ and____________.$(b)$. The passage of an electric current through a solution causes __________ effects.$(c)$. If you pass current through copper sulphate solution, copper gets deposited on the plate connected to the terminal of the battery.$(d)$. The process of depositing a layer of any desired metal on another material by means of electricity is called.
- In an electrolytic tank, aluminium metal is being extracted by the electrolysis of molten aluminium oxide using carbon electrodes. It is observed that one of the carbon electrodes is gradually burnt away and has to be replaced.(a) Which carbon electrode (cathode or anode) is burnt away? (b) Why is this carbon electrode burnt away?
- Paheli took a wire of length 10 cm. Boojho took a wire of 5 cm of the same material and thickness. Both of them connected the wires as shown in the circuit given in figure. The current flowing in both the circuits is the same.$(i)$. Will the heat produced in both the cases be equal? Explain.$(ii)$. Will the heat produced be the same if the wires taken by them are of equal lengths but of different thickness? Explain."
- Paheli connected two bulbs to a cell as shown in the figure,She found that filament of bulb B is broken. Will bulb A glow in this circuit? Give reason."
- Observe the circuit gven in the figure.Boojho set up this circuit for purification of copper. What will be the nature of – (a) plate A (b) plate B (c) and the solution.Explain the process of purification."
- In an experiment, 4.90 g of copper oxide was obtained from 3.92 g of copper. In another experiment, 4.55 g of copper oxide gave, on reduction, 3.64 g of copper. Show with the help of calculations that these figures verify the law of constant proportions.
- Paheli had bought a new bottle of pickle from the market. She tried to open the metal cap to taste it but could not do so. She then took a bowl of hot water and immersed the upper end of the bottle in it for five minutes. She could easily open the bottle now. Can you give the reason for this?
- In a circuit, ______ current flows from the positive terminal of a cell to the negative terminal of the cell.
- Nazima is fly fishing in a stream. The trip of her fishing rod is 1.8m above the surface of the water and the fly at the end of the string rests on the water 3.6m away and 2.4 m from a point directly under the trip of the rod. Assuming that her string (from the trip of the rod to the fly) is that, how much string does she have out (see the figure)? If she pills in the string at the rate of 5 cm per second, what will be the horizontal distance of the fly from her after 12 seconds?"
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