Chemical Effects of Electric Current - Class 8 Science - Chapter 11 - Notes, NCERT Solutions & Extra Questions
Renews every month. Cancel anytime
Your personal doubt-solving assistant
Chatterbot AI gives you 100% accurate answers to your questions in an instant.
Notes - Chemical Effects of Electric Current | Class 8 NCERT | Science
Chemical Effects of Electric Current: Class 8 Notes
Introduction to Chemical Effects of Electric Current
Understanding the chemical effects of electric current is essential as it plays a pivotal role in various everyday applications, from electroplating to the functioning of batteries. Have you ever wondered why your elders caution against touching electrical appliances with wet hands? That's because water, especially if it contains salts or minerals, can conduct electricity and pose a risk of electric shock.
Conductors and Insulators
To start, let’s recap the basic concepts of conductors and insulators. Good conductors of electricity, such as metals...
We've got so much more in store, just for you! 🤩
Sign up to unlock Notes and everything else
Unlock now 🔓🚀 Learn more about Notes with Chatterbot AI
Notes - Flashcards - Chemical Effects of Electric Current | Class 8 NCERT | Science
Back Questions - Chemical Effects of Electric Current | NCERT | Science | Class 8
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 ______________ .
(a) Most liquids that conduct electricity are solutions of, acids, bases, and salts.
(b) The passage of an electric current through a solution causes chemical effects.
(c) If you pass current through copper sulphate solution, copper gets deposited on the plate connected to the negative terminal of the battery.
(d) The process of depositing a layer of any desired metal on another material by means of electricity is called electroplating.
When the free ends of a tester are dipped into a solution, the magnetic needle shows deflection. Can you explain the reason?
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Name three liquids which, when tested in the manner shown in Fig.11.9, may cause the magnetic needle to deflect.
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
The bulb does not glow in the setup shown in Fig.11.10. List the possible reasons. Explain your answer
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
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.
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Does pure water conduct electricity? If not, what can we do to make it conducting?
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
In case of a fire, before the firemen use the water hoses, they shut off the main electrical supply for the area. Explain why they do this.
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
A child staying in a coastal region tests the drinking water and also the seawater with his tester. He finds that the compass needle deflects more in the case of seawater. Can you explain the reason?
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Is it safe for the electrician to carry out electrical repairs outdoors during heavy downpour? Explain.
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Paheli had heard that rainwater is as good as distilled water. So she collected some rainwater in a clean glass tumbler and tested it using a tester. To her surprise she found that the compass needle showed deflection. What could be the reasons?
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Prepare a list of objects around you that are electroplated.
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
The process that you saw in Activity 11.7 is used for purification of copper. A thin plate of pure copper and a thick rod of impure copper are used as electrodes. Copper from impure rod is sought to be transferred to the thin copper plate. Which electrode should be attached to the positive terminal of the battery and why?
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
💡 Have more questions?
Ask Chatterbot AIShort Questions - Chemical Effects of Electric Current | NCERT | Science | Class 8
Why is it dangerous to touch an electrical appliance with wet hands?
It is dangerous to touch an electrical appliance with wet hands because water is a good conductor of electricity. Through water, electric current can pass more easily, resulting in electrical shock.
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Why is distilled water a poor conductor of electricity when compared to tap water or other natural sources?
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
💡 Have more questions?
Ask Chatterbot AILong Questions - Chemical Effects of Electric Current | NCERT | Science | Class 8
Explain in detail what happens when an electrical circuit tester is used on a liquid that conducts electricity. Discuss the mechanisms by which the tester indicates whether or not the liquid allows the electric current to pass through, including the role of the bulb in the tester and how its glow or lack thereof represents the current’s strength.
When a liquid that conducts electricity is tested with an electrical circuit tester, the tester completes its circuit and allows electric current to pass through the liquid, thereby causing the bulb in the tester to glow. This suggests that the liquid is a good conductor of electricity. Conversely, if the liquid does not allow the electrical current to pass, the tester's circuit remains incomplete, and the bulb does not glow, indicating that the liquid is a poor conductor. However, there may be scenarios where even a conducting liquid will not make the bulb glow due to too weak of a current. This is because the bulb's glow is dependent on the heating effect generated by the strength of the electric current. If the current is weak the bulb's filament does not get heated sufficiently and it does not glow.
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
💡 Have more questions?
Ask Chatterbot AIExtra Questions - Chemical Effects of Electric Current | NCERT | Science | Class 8
When electric current is passed through a bulb, the bulb gives light because of:
A) electric effect of current
B) heating effect of current
C) glowing effect of current
D) lighting effect of current
The correct answer is Option B: heating effect of current.
The reason a bulb emits light when electric current passes through it is primarily due to the heating effect of current. In bulbs, particularly incandescent bulbs, a special type of wire known as tungsten is used. When electric current flows through the tungsten filament, it experiences resistance, leading to the generation of heat. As the temperature of the tungsten wire increases, it glows and emits light. The glow and subsequent emission of light are direct results of the filament reaching a high temperature, which is achieved due to the heating effect of electrical current.
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
How does a sodium carbonate extinguisher work? Can it be used to put out electrical fires?
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
💡 Have more questions?
Ask Chatterbot AI