Page 153 - Science Class 08
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Chemical Effects of Current
• Electrolysis • Ion
• Electropla ng • Chemical Analysis of Electropla ng
• Importance of Electropla ng • Electropla ng in Industries
In the previous chapter, you have studied
about the charges at rest, i.e., sta c electricity.
Aim : To show whether liquids conduct
You have also studied how current electricity
electricity or not.
pass through conductors from one body to
Method:
another. As the solids allowing electricity to
Take a cap of bo le and fix two nails in it
pass through them, are mainly metals and
using wax of candle. Connect the nails to the
alloys. No chemical change occurs when an
two terminals of a 6-volt ba ery through a
electric current passes through a metallic bulb and a switch. Now, pour some tap water
conductor. There are some solids which do not in the cap so that the nails are immersed in
allow electricity to pass through them called tape water. Switch on the current.
non-conductors or insulators such as non- Repeat the experiment with salt solu on,
metals(except graphite) rock salt, etc. lemon juice, kerosene, dis lled water,
As of now, we will discuss about the effects of glucose solu on and alcohol solu on.
What do you observe?
current electricity when it is passed through
liquids. We will also try to know whether Do all liquids conduct electricity? What
conclusion did you get?
liquids allow electricity to pass through them
The bulb glows in the case of tap water, salt
or not.
solu on and lemon juice.
Let us do an ac vity to find out whether a liquid
The bulb does not glow in the case of
conducts electricity or not: dis lled water, glucose solu on, kerosene
and alcohol solu on.
Science-8 153
