Class 8 Exam > Class 8 Notes > Science Class 8 > Worksheet: Chemical Effects of Electric Current
Class 8 Science - Chemical Effects of Electric Current CBSE Worksheets
Q1: Which effect of electric current is utilized for detecting the flow of current through a solution when a compass is used?
Q2: What is meant by the chemical effect of electric current? Give an example.
Why is electroplating useful?
Q3: A beaker contains an acidified copper sulphate solution. A copper plate and a carbon rod are kept in this copper sulphate solution. The copper plate is connected to the positive terminal of a battery whereas the carbon rod is connected to the negative terminal of the battery. What happens when electric current is passed through copper sulphate solution?
Q4: Name two metals which are usually electroplated on cheaper metals for making jewelry (or ornaments).
Q5: Why the bulb glows when the electric current passes through it?
Q6: Tap water conducts electricity whereas distilled water does not. Give reason.
Q7: The process that you saw in Activity 14.7 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 battery and why?
Q8: Does pure water conduct electricity? If not, what can we do to make it conducting?
Q9: 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.
Q10: What happens when electric current is passed through acidified water?
Q11: 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?
Q12: What is the advantage of using LED in testing the electrical conductivity of liquids?
Q13: For electroplating copper on an iron object, which terminal of the battery (positive or negative) is connected to the iron object?
Q14: Is it safe for the electrician to carry out electrical repairs outdoors during heavy downpour? Explain.
Q15: Which is the polluting waste generated by electroplating factories?
You can find Worksheets Solutions here: Worksheet Solutions: Chemical Effects of Electric Current
The document Class 8 Science - Chemical Effects of Electric Current CBSE Worksheets is a part of the Class 8 Course Science Class 8.
All you need of Class 8 at this link: Class 8
|
91 videos|273 docs|44 tests
|
FAQs on Class 8 Science - Chemical Effects of Electric Current CBSE Worksheets
| 1. What are the chemical effects of electric current? |  |
Ans. The chemical effects of electric current refer to the changes that occur in a substance when an electric current passes through it. These effects include the decomposition of electrolytes, the formation of new substances, and the deposition of metals on electrodes.
| 2. How does an electric current cause electrolysis? | |
Ans. When an electric current is passed through an electrolyte, it causes the ions in the electrolyte to move towards the electrodes. At the positive electrode (anode), negatively charged ions (anions) lose electrons and get oxidized, while at the negative electrode (cathode), positively charged ions (cations) gain electrons and get reduced. This leads to the process of electrolysis.
| 3. What is electroplating? | |
Ans. Electroplating is a process in which a thin layer of metal is deposited onto the surface of an object using electric current. It is done by immersing the object (to be plated) and a metal electrode (to be deposited) into an electrolyte solution and passing a current through them. This causes the metal ions from the electrolyte to get reduced and form a layer on the object.
| 4. How is electroplating useful in everyday life? | |
Ans. Electroplating has various applications in everyday life. It is used to improve the appearance of objects by giving them a shiny and attractive surface. For example, jewelry, silverware, and car parts are often electroplated. It is also used to prevent corrosion by coating objects with a layer of a less reactive metal. Additionally, electroplating is used in electrorefining processes to purify metals.
| 5. What is the role of electrodes in the chemical effects of electric current? | |
Ans. Electrodes play a crucial role in the chemical effects of electric current. They are the conductors that allow the electric current to enter and leave the electrolyte. The positive electrode (anode) attracts negatively charged ions (anions) and undergoes oxidation, while the negative electrode (cathode) attracts positively charged ions (cations) and undergoes reduction. The choice of electrodes can also determine the type of reaction and the substances formed during the chemical effects of electric current.
Related Exams
About this Document
|
1.6K Views |
|
4.95/5 Rating |
|
Oct 24, 2024 Last updated |
Document Description: Worksheet: Chemical Effects of Electric Current for Class 8 2024 is part of Science Class 8 preparation.
The notes and questions for Worksheet: Chemical Effects of Electric Current have been prepared according to the Class 8 exam syllabus. Information about Worksheet: Chemical Effects of Electric Current covers topics
like and Worksheet: Chemical Effects of Electric Current Example, for Class 8 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises and tests below for Worksheet: Chemical Effects of Electric Current.
Introduction of Worksheet: Chemical Effects of Electric Current in English is available as part of our Science Class 8
for Class 8 & Worksheet: Chemical Effects of Electric Current in Hindi for Science Class 8 course.
Download more important topics related with notes, lectures and mock test series for Class 8
Exam by signing up for free. Class 8: Class 8 Science - Chemical Effects of Electric Current CBSE Worksheets
Description
Full syllabus notes, lecture & questions for Class 8 Science - Chemical Effects of Electric Current CBSE Worksheets - Class 8 | Plus excerises question with solution to help you revise complete syllabus for Science Class 8 | Best notes, free PDF download
Information about Worksheet: Chemical Effects of Electric Current
In this doc you can find the meaning of Worksheet: Chemical Effects of Electric Current defined & explained in the simplest way possible. Besides explaining types of
Worksheet: Chemical Effects of Electric Current theory, EduRev gives you an ample number of questions to practice Worksheet: Chemical Effects of Electric Current tests, examples and also practice Class 8
tests
|
Explore Courses for Class 8 exam
|
|
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
Related Searches
Free
,Previous Year Questions with Solutions
,ppt
,Semester Notes
,Class 8 Science - Chemical Effects of Electric Current CBSE Worksheets
,study material
,mock tests for examination
,MCQs
,shortcuts and tricks
,Class 8 Science - Chemical Effects of Electric Current CBSE Worksheets
,Extra Questions
,video lectures
,Summary
,Class 8 Science - Chemical Effects of Electric Current CBSE Worksheets
,Objective type Questions
,Important questions
,past year papers
,Viva Questions
,Exam
,Sample Paper
,practice quizzes
;
Additional Information about Worksheet: Chemical Effects of Electric Current for Class 8 Preparation
Worksheet: Chemical Effects of Electric Current Free PDF Download
The Worksheet: Chemical Effects of Electric Current is an invaluable resource that delves deep into the core of the Class 8 exam.
These study notes are curated by experts and cover all the essential topics and concepts, making your preparation more efficient and effective.
With the help of these notes, you can grasp complex subjects quickly, revise important points easily,
and reinforce your understanding of key concepts. The study notes are presented in a concise and easy-to-understand manner,
allowing you to optimize your learning process. Whether you're looking for best-recommended books, sample papers, study material,
or toppers' notes, this PDF has got you covered. Download the Worksheet: Chemical Effects of Electric Current now and kickstart your journey towards success in the Class 8 exam.
Importance of Worksheet: Chemical Effects of Electric Current
The importance of Worksheet: Chemical Effects of Electric Current cannot be overstated, especially for Class 8 aspirants.
This document holds the key to success in the Class 8 exam.
It offers a detailed understanding of the concept, providing invaluable insights into the topic.
By knowing the concepts well in advance, students can plan their preparation effectively.
Utilize this indispensable guide for a well-rounded preparation and achieve your desired results.
Worksheet: Chemical Effects of Electric Current Notes
Worksheet: Chemical Effects of Electric Current Notes offer in-depth insights into the specific topic to help you master it with ease.
This comprehensive document covers all aspects related to Worksheet: Chemical Effects of Electric Current.
It includes detailed information about the exam syllabus, recommended books, and study materials for a well-rounded preparation.
Practice papers and question papers enable you to assess your progress effectively.
Additionally, the paper analysis provides valuable tips for tackling the exam strategically.
Access to Toppers' notes gives you an edge in understanding complex concepts.
Whether you're a beginner or aiming for advanced proficiency, Worksheet: Chemical Effects of Electric Current Notes on EduRev are your ultimate resource for success.
Worksheet: Chemical Effects of Electric Current Class 8 Questions
The "Worksheet: Chemical Effects of Electric Current Class 8 Questions" guide is a valuable resource for all aspiring students preparing for the
Class 8 exam. It focuses on providing a wide range of practice questions to help students gauge
their understanding of the exam topics. These questions cover the entire syllabus, ensuring comprehensive preparation.
The guide includes previous years' question papers for students to familiarize themselves with the exam's format and difficulty level.
Additionally, it offers subject-specific question banks, allowing students to focus on weak areas and improve their performance.
Study Worksheet: Chemical Effects of Electric Current on the App
Students of Class 8 can study Worksheet: Chemical Effects of Electric Current alongwith tests & analysis from the EduRev app,
which will help them while preparing for their exam. Apart from the Worksheet: Chemical Effects of Electric Current,
students can also utilize the EduRev App for other study materials such as previous year question papers, syllabus, important questions, etc.
The EduRev App will make your learning easier as you can access it from anywhere you want.
The content of Worksheet: Chemical Effects of Electric Current is prepared as per the latest Class 8 syllabus.
|
© EduRev
|
Education Revolution
|
Follow Us
|
Signup to see your scores
go up within 7 days!
Access 1000+ FREE Docs, Videos and Tests
Takes less than 10 seconds to signup