NCERT Solutions for Class 8 Science Chapter 14 Chemical Effects Of Electric Current
NCERT Solutions for Class 8 Science Chapter 14 Chemical Effects of Electric Current: Often your parents ask you not to touch dysfunctional electrical appliances with wet hands. Or while turning on or off electrical appliances, they ask you to wear slippers. All these precautions are taken just to avoid the effects of electric current. In CBSE NCERT solutions for Class 8 Science chapter 14 Chemical Effects of Electric Current, you will get to learn what is the electric current, how electricity can be used in chemical reactions, what are the applications of the chemical effect of current etc. NCERT Solutions help students to understand the chapter well. Having solutions of NCERT for Class 8 Science chapter 14 Chemical Effects of Electric Current ready in hand will be beneficial for exam preparation. Try yourself to do the exercise questions before taking the help of NCERT solutions for Class 8 Science chapter 14 Chemical Effects of Electric Current.
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NCERT Solutions for Class 8 Science Chapter 14 Chemical Effects of Electric Current: Solved Exercise Questions
Q1. Fill in the blanks.
Answer:
(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 .
Answer:
The magnetic needle shows deflection and therefore current must be flowing through the circuit. The circuit is complete and therefore the solution is electrically conducting due to the presence of charged particles called ions.
Answer:
Three liquids which may cause the magnetic needle to deflect when tested in the manner shown in Fig 14.9 are lemon juice, salt solution and vinegar.
Answer:
The bulb might not glow due to the following reasons:
(a) The liquid might not be a conductor of electricity.
(b) The current might be very weak and not sufficient enough to light the bulb, this could happen due to the battery not being charged or because of the circuit being poorly conducting.
(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.
Answer:
(i) liquid A is a better conductor than liquid B.
The brightness of the bulb depends on the current flowing through it which in turn depends on the conductivity of the liquid. Since the brightness of the bulb is more in case of liquid A we conclude liquid A is a better conductor than liquid B.
Q6. Does pure water conduct electricity? If not, what can we do to make it conducting?
Answer:
No, pure water does not conduct electricity because of the absence of charged particles known as ions which facilitate conduction of electricity. To make it conducting we can add salt, acid or base to the water.
Answer:
As we know water is a conductor of electricity, the poured water may come in contact with some electrical appliance or electrical cable causing the current to reach the firemen and harm them. Thus to avoid this the main electrical supply for the area is shut down before the firemen use the water hoses.
Answer:
Seawater is salty and as we know salt imparts the property of electrical conduction to water, it will be more conducting than drinking water which has a lesser amount of dissolved salt than seawater. Due to higher electrical conductivity, the deflection of the needle is more in the case of seawater.
Answer:
No, it is not safe for the electrician to carry out electrical repairs outdoors during a heavy downpour as rainwater contains dissolved salts which makes rainwater a good conductor of electricity and due to this the electrician might get an electric shock while working outdoors during a heavy downpour.
Answer:
The reason behind the needle showing deflection in case of rainwater is the fact that rainwater has dissolved salts in it which makes it a good conductor of electricity whereas distilled water is completely devoid of any salts and does not conduct electricity.
Q11. Prepare a list of objects around you that are electroplated.
Answer:
List of objects which are electroplated around us:
(i) Gold is electroplated on ornaments.
(ii) Zinc is electroplated on pipes and machinery.
(iii) Chromium is electroplated on parts of vehicles.
(iv) Tin is used to coat metal containers for food.
Answer:
Copper ions carry a positive charge and would be attracted towards the negative terminal. Since we want to transfer copper from the thick impure copper rod to the thin copper strip, the thick copper rod should be connected to the positive terminal of the battery and consequently the thin copper strip to the negative terminal of the battery.
Chemical Effects of Electric Current Class 8 NCERT Science: Topics
- Do Liquids Conduct Electricity?
- Chemical Effects of Electric Current
- Electroplating
NCERT Solutions For Class 8 Science- Chapter-Wise
Chapter 1 | |
Chapter 2 | |
Chapter 3 | |
Chapter 4 | |
Chapter 5 | |
Chapter 6 | |
Chapter 7 | |
Chapter 8 | |
Chapter 9 | |
Chapter 10 | |
Chapter 11 | |
Chapter 12 | |
Chapter 13 | |
Chapter 14 | Chemical Effects of Electric Current |
Chapter 15 | |
Chapter 16 | |
Chapter 17 | |
Chapter 18 |
NCERT Solutions For Class 8: Subject-Wise
NCERT Solutions for Class 8 Science Chapter 14 Chemical effects of electric current - Points to remember:
Some of the important points that you will learn with the help of NCERT solutions for Class 8 Science chapter 14 Chemical Effects of Electric Current are as follows:
- Liquids that can conduct electricity. For example tap water, salt solutions, acid solution, base solution, etc. This is due to the presence of minerals in the liquid. In distilled water minerals are absent, so it does not allow passage of current
- When we pass electricity through a chemical solution certain reactions take place. These reactions are collectively called the chemical effects of electric current.
- Chemical effects of electric current are used for various applications. E.g electroplating.
- Electroplating is the deposition of a layer of desired metal onto another material via electricity.
Also Check NCERT Books and NCERT Syllabus here:
Frequently Asked Question (FAQs) - NCERT Solutions for Class 8 Science Chapter 14 Chemical Effects Of Electric Current
Question: What are the topics covered in NCERT Class 8 Science chapter 14 ?
Answer:
Here are the topics covered in NCERT Class 8 Science chapter 14
- Do Liquids Conduct Electricity?
- Chemical Effects of Electric Current
- Electroplating
Question: What is electroplating?
Answer:
Electroplating is the chemical process of covering an object with a thin layer of metal by electrochemical disposition
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