1.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 _________.
1.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 _________.
Explanation:
(A) Solutions of acids, bases, and salts make up the majority of electrically conducting liquids.
(b) Chemical reactions happen when an electric current flows through a solution.
(c) Copper is deposited on the plate attached to the battery's negative terminal when current is passed through a copper sulphate solution.
(d) Electroplating is the method of applying a layer of any desired metal to another material using electricity.
2. The magnetic needle of a tester exhibits deflection when the free ends are immersed into a solution. Can you give a justification?
2. The magnetic needle of a tester exhibits deflection when the free ends are immersed into a solution. Can you give a justification?
Explanation:
The deflection of the compass needle indicates that current is flowing through the wire. As soon as the tester's free ends are submerged in the liquid, the circuit is complete. As a result, the solution is conducting, and the compass needle exhibits deflection.
conducting solution; hence, deflection is obtained in the compass needle.
3.Name three liquids, which when tested in the manner shown in Fig.14.9, may cause the magnetic needle to deflect.
3.Name three liquids, which when tested in the manner shown in Fig.14.9, may cause the magnetic needle to deflect.
Explanation:
First, saltwater
Second, lemon juice
Third: Vegetable oil
As they will cause the magnetic needle to deflect, these liquids can
4. The bulb does not glow in the setup shown in Fig.14.10. List the possible reasons. Explain your answer.
4. The bulb does not glow in the setup shown in Fig.14.10. List the possible reasons. Explain your answer.
Explanation:
The following factors could be to blame for the bulb not glowing:
a). The liquid might not conduct electricity. Because of the gap in the circuit, no current can flow through the liquid in this situation.
b). Electric current may be weak because the circuit is constructed of materials that are poor electrical conductors or because there is not enough power in the battery to produce electricity.
5. A tester is used to check the conduction of electricity through two liquids, labelled A and B. It is found that the bulb of the tester glows brightly for liquid A, while it glows very dimly for liquid B. You would conclude that
(i) liquid A is a better conductor than liquid B.
(ii) liquid B is a better conductor than liquid A.
(iii) both liquids are equally conducting.
(iv) conducting properties of liquid cannot be compared in this manner.
5. A tester is used to check the conduction of electricity through two liquids, labelled A and B. It is found that the bulb of the tester glows brightly for liquid A, while it glows very dimly for liquid B. You would conclude that
(i) liquid A is a better conductor than liquid B.
(ii) liquid B is a better conductor than liquid A.
(iii) both liquids are equally conducting.
(iv) conducting properties of liquid cannot be compared in this manner.
Explanation:
Compared to liquid B, liquid A is a better conductor.
The quantity of current passing through the solution is governed by its conductivity. As conductivity increases, so does the amount of current passing through the solution; conversely, as conductivity decreases, so does the amount of current passing through. Hence, liquid A's conductivity is higher than that of liquid B.
6. Does electricity flow through pure water? What can we do to get it to behave if not?
6. Does electricity flow through pure water? What can we do to get it to behave if not?
Explanation:
As it doesn't contain any salt at all, pure water doesn't carry electricity. Water becomes a conducting medium when sodium chloride, or common salt, is added in minute amounts.
7. In the event of a fire ,the firefighters turn off the main electrical supply to the area before using water hoses.justify their action.
7. In the event of a fire ,the firefighters turn off the main electrical supply to the area before using water hoses.justify their action.
Explanation:
In the event of a fire, the firemen turn off the main electrical supply before using the water hoses since the water could conduct electricity when it comes in contact with the electrical appliances, increasing the likelihood that electricity will travel through the wire. The firemen can suffer from this.
8. A young person who lives near the ocean uses his tester to test both the drinking water and the seawater. In the case of seawater, he discovers that the compass needle deflects more. Can you give a justification?
8. A young person who lives near the ocean uses his tester to test both the drinking water and the seawater. In the case of seawater, he discovers that the compass needle deflects more. Can you give a justification?
Explanation:
In comparison to drinking water, seawater has a higher concentration of dissolved salts. Seawater will therefore act as a greater conductor than regular water. It is the cause of the needle's higher deflection in seawater compared to drinking water.
9. Is it safe for the electrician to carry out electrical repairs outdoors during heavy downpours? Explain.
9. Is it safe for the electrician to carry out electrical repairs outdoors during heavy downpours? Explain.
Explanation:
No. Repairing electrical items outside while it's pouring heavily is not safe. Since it contains some dissolved salts, rainwater conducts electricity. As the electrician works outside through a torrential downpour, this could result in electric shocks and other injury.
10. Make a list of the electroplated items you may find around.
10. Make a list of the electroplated items you may find around.
Explanation:
Chromium plating is a process used to give the exterior of cars a dazzling appearance.
Gold plating: Gold-plated Ornaments are silver ornaments that have had a tiny film of gold applied to them.
Zinc plating: To prevent rust and corrosion on iron used in construction, a layer of zinc is applied to the metal.
11. Copper is purified using the technique you witnessed in Exercise 14.7. The electrodes are a thick impure copper rod and a thin plate of pure copper. It is intended to transfer copper from the impure rod to the thin copper plate. What electrode should be connected to the battery's positive terminal, and why?
11. Copper is purified using the technique you witnessed in Exercise 14.7. The electrodes are a thick impure copper rod and a thin plate of pure copper. It is intended to transfer copper from the impure rod to the thin copper plate. What electrode should be connected to the battery's positive terminal, and why?
Explanation:
Because the electric current splits into copper and sulphate when it passes through the copper sulphate solution, the thick rod of the impure copper plate must be linked to the positive terminal of the battery. Positively charged free copper is pulled to the battery's negative terminal and deposits itself there. But, the impure copper rod, which is connected to the positive terminal of the battery, makes up for the copper that was lost in the solution.
