Question

14.Take two pencils and sharpen both the ends. Fill the beaker with tap water. Connect the

graphite of pencils to 9v battery and the contact should be good. Use a piece of card

board to hold the pencils in a vertical position. Now wait for 3 – 4 minutes and observe

the electrodes carefully.

a) what do you observe near the graphite of pencils?

b) Name the phenomenon associated with it.

c) What would you add to make water more conductive?

d) which precautionary measure need to be taken?​

Answer 1

Answer:

As soon as you connect the wires to the battery, you will see bubbles appearing around each of the pencil tips in the water and floating upward. Those bubbles are the components of water—hydrogen and oxygen gas—that have been split apart by the electricity as it travels through the water from one pencil to the other. The pencil attached to the negative terminal of the battery collects hydrogen gas while the one connected to the positive terminal collects oxygen

Explanation:

Hint: Water’s chemical name is H2O because it has two hydrogen atoms to every one oxygen atom.)

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