Activity 14.3 Class 8 Science Chapter Chemical Effects of Electric Current
Today we will discuss activity 14.3
class 8 science chapter 14 chemical effects of electric current. You should also go through activity 14.2 of
chapter 14. In this activity 14.3, we will discuss whether liquids like lemon juice
or vinegar are good conductors or poor conductors?
You are suggested to study NCERT activity 14.3 class 8 science explanation with a conclusion so that you can attempt questions based on activity 14.3 class 8 science.
Activity
·
Take
the tray from inside a discarded matchbox.
·
Wrap
an electric wire a few times around the tray.
·
Place
a small compass needle inside it.
·
Now
connect one free end of the wire to the terminal of a battery.
·
Leave the other end free.
·
Take
another piece of wire and connect it to the other terminal of the battery.
·
Join
the free ends of two wires momentarily.
·
The
compass needle should show deflection.
·
Your
tester with two free ends of the wire is ready.
·
Now
repeat Activity 14.2 using this tester.
·
Do
you find a deflection in the compass needle the moment you dip the free ends of
the tester in lemon juice?
·
Take
out the ends of the tester from the lemon juice, dip them in water and then
wipe them dry.
·
Repeat
the activity with other liquids such as tap water, vegetable oil, milk, and honey.
(Remember to wash and wipe dry the ends of the tester after
testing each liquid).
·
In
each case observe whether the magnetic needle shows deflection or not.
·
Record your observations in Table.
Observation and explanation
At first, we will make a tester. For this, we wrap wire
on a discarded matchbox. Now we place a compass needle in the box and connect
one free end of the wire to the terminal of the battery.
Now we take another wire and connect its free end to
the other terminal of the battery. After doing this, we join the two ends of
wires, and the compass needle shows deflection. now our tester is ready for the
activity.
Now we will check the conductivity of different
liquids as we did in activity 14.2.
We dip the two free ends of wires in the given liquids
such as lemon juice, Vinegar, Tap Water, Vegetable oil, Milk, Honey, etc.
If the compass needle shows deflection, it means the
liquid conducts electricity and if the compass needle does not show any deflection,
this means the given liquid does not conduct electricity.
We will record observations in the table.
|
S. No. |
Material |
Compass needle shows
deflection Yes/no |
Good conductor/poor
conductor |
|
1 |
Lemon juice |
Yes |
Conductor |
|
2 |
Vinegar |
Yes |
Conductor |
|
3 |
Tap water |
Yes |
Conductor |
|
4 |
Vegetable oil |
No |
Insulator |
|
5 |
Milk |
Yes |
Conductor |
|
6 |
Honey |
No |
Insulator |
|
7 |
Distilled water |
No |
Insulator |
|
8 |
Kerosene oil |
No |
Insulator |
|
9 |
|
|
|
|
10 |
|
|
|
Conclusion
Through this activity, we have learnt about the
conductivity of electricity by liquids.
Related Topics
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