Question

Write an activity to demonstrate the change in colour caused by the chemical effect of electric current draw diagram​

Answer 1

Answer:

take a red and blu litmus

Explanation:

place the red litmus on a lemon and see what happens the litmus stays the same and then place a blue litmus on lemon it turns red this indicates that the lemon is acidic.

Place a blue litmus on baking soda its stays the same and this indicates that the baking soda is a base.

Construct a circuit using two cells, an LED and connecting wires.

Immerse the two free ends of the wires into a beaker containing water or any liquid without touching each other, but also keep in mind that they must not be separated by a large distance.

If the LED glows, the liquid conducts electricity and in case the LED does not glow, we can say the liquid does not conduct electricity.

If the brightness of the LED glow is high, then those liquids are good conductors

In case the brightness of the LED is low, it indicates that less current is going through those liquids and they are poor conductors of electricity.

If the LED does not glow, it denotes that such liquids are insulators.

Different solutions or liquids conduct electricity differently. If we talk about the ordinary water, like the water from the tap or the well, these water contains minerals and salts. So these dissolved materials help to conduct them. But in the case of distilled water, there are no salts or minerals dissolved in it. As a result, the current will not flow in this case

Answer 2

Answer: Change in the color is due to the chemical effect of electric current.

Explanation: Activity:

• Take a potato, cut a portion of it.
• Insert two copper wires connected to a battery and a galvanometer into the potato.
• After a while, a greenish blue spot can be seen on the potato around one wire and no such spot around the second one.
• The change in the color shows that there is a chemical change due to electric current.
• The one which changed the color is the positive terminal and the other is negative terminal of the battery.