Summary and Question Answer of NCERT Class 8 Science Chapter 14, Titled “Chemical Effects of Electric Current"
Summary and Question Answer of NCERT Class 8 Science Chapter 14, Titled “Chemical Effects of Electric Current"
Summary/Question and Answer (Very Short Answer Question, Short Answer Question, Long Answer Question) / Assertion and Reasoning / Fill In the Blanks / Case Study Question and Answer
Chapter 14 - "Chemical
Effects of Electric Current" in Class 8 Science NCERT.
Summary/Question and
Answer (Very Short Answer Question, Short Answer Question, Long Answer
Question) / Assertion and Reasoning / Fill In the Blanks / Case Study Question
and Answer
1. Introduction to Chemical Effects of Electric Current:
Electricity is not just about lighting bulbs or running
appliances; it can also cause chemical changes in certain materials. When
electricity passes through substances, it can lead to chemical reactions. This
phenomenon is called the chemical effect of electric current.
2. Conductors and Non-Conductors:
- Conductors:
These are materials that allow electric current to pass through them.
Metals like copper, aluminum, and iron are good conductors of electricity.
- Non-Conductors
(Insulators): These materials do not allow electricity to pass through
them. Rubber, plastic, and wood are examples of insulators.
3. Electrolytes and Non-Electrolytes:
- Electrolytes:
These are substances that conduct electricity when dissolved in water
because they form ions. Common electrolytes include acids, bases, and
salts.
- Non-Electrolytes:
Substances that do not dissociate into ions in solution and do not conduct
electricity. Examples include sugar and alcohol.
4. Electroplating:
Electroplating is a process of depositing a layer of any
desired metal on another material by means of electricity. It is used for
various purposes such as preventing corrosion, making objects more attractive, and
providing a durable coating on objects.
How Electroplating Works:
- Setup:
The object to be electroplated is made the cathode (negative electrode) in
an electrolytic cell. The metal to be plated is made the anode (positive
electrode).
- Electrolyte:
The electrolyte is a solution containing ions of the metal to be plated.
- Process:
When electric current is passed through the electrolyte, metal ions from
the anode are deposited on the cathode, forming a layer of the metal on
the object.
5. Chemical Effects of Electric Current in Daily Life:
- Electroplating:
Used in making jewelry, silverware, and chrome-plating on automobiles.
- Electrolysis:
Used for electroplating, electro-refining of metals, and in the extraction
of some metals from their ores.
6. Safety Measures in Electroplating:
Since electroplating involves the use of chemicals and
electricity, it is crucial to follow safety precautions. Proper ventilation,
safety goggles, and gloves are essential. Direct skin contact with chemicals
should be avoided.
7. Electroplating and Its Uses:
Various industries utilize electroplating for making
decorative items, preventing corrosion, and enhancing the quality of objects.
For example, copper is electroplated on electrical wires to prevent them from
rusting.
8. Applications of Electroplating in Industries:
- Decorative
Purposes: Electroplating is used for making decorative items such as
jewelry and utensils.
- Corrosion
Prevention: Objects like car parts and pipes are electroplated to
prevent them from corroding.
- Enhancing
Durability: Objects like coins and medals are electroplated to enhance
their durability.
9. Summary and Revision:
The chapter concludes with a summary of the key points
learned, encouraging students to revise the concepts of chemical effects of
electric current.
******************------------------------------**************************------------------------------------
Question and Answer
Fill in the blanks.
(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: Three
liquids that may cause the magnetic needle to deflect in the manner shown in
Fig. 14.5 are acidic solutions, basic solutions, and salt solutions.
Answer: The
bulb does not glow in the setup shown in Fig. 14.6 due to possible reasons like
an open circuit, a faulty bulb, or improper connections. The exact reason
should be investigated.
Answer: (i)
liquid A is a better conductor than liquid B. The brightness of the bulb
indicates the conductivity, and a brighter glow means better conductivity.
Answer: Pure
water does not conduct electricity. To make it conducting, we can add impurities or electrolytes like
salt or acids.
Answer:
Shutting off the main electrical supply before using water hoses during a fire
is essential to prevent electrical
accidents due to water acting as a conductor and causing electric
shocks.
Answer: The
compass needle deflects more in seawater because it contains more dissolved salts and ions, making it a better
conductor of electricity than drinking water.
Answer: It is
not safe for an electrician to
carry out electrical repairs outdoors during heavy downpour due to the risk of
electric shock. Water can conduct electricity, increasing the danger.
Answer: The
deflection of the compass needle in rainwater could be due to dissolved impurities or ions, making
it a conductor, unlike distilled water.
Answer:
Objects around us that are electroplated include jewelry, coins, cutlery, car parts, and decorative items.
Answer: The thin copper plate should be attached
to the positive terminal of the battery.
This is because during electrolysis, the metal to be plated (copper in this
case) should be connected to the positive terminal to attract the negatively
charged ions and deposit pure copper on the thin plate.
******************------------------------------**************************------------------------------------
20 one-mark very short answer questions related to the
chapter "Chemical Effects of Electric Current" along with their
concise answers:
Question 1: What is the process of depositing a layer
of metal on an object using electricity called?
Answer: Electroplating.
Question 2: Which type of solutions can conduct
electricity?
Answer: Acidic, basic, and salt solutions.
Question 3: Name the device used to check the flow of
electric current through a circuit.
Answer: Tester.
Question 4: What happens to the magnetic needle of a
compass when an electric current flows through it?
Answer: It deflects.
Question 5: Why do we shut off the main electrical
supply during a fire?
Answer: To prevent electric shocks due to water
conducting electricity.
Question 6: What happens when electricity is passed
through copper sulphate solution?
Answer: Copper gets deposited on the electrode
connected to the negative terminal of the battery.
Question 7: Which metal is commonly used for
electroplating iron objects to prevent rusting?
Answer: Zinc.
Question 8: Why do ionic compounds have high melting
points?
Answer: Due to strong electrostatic forces between
ions.
Question 9: Which gas is evolved at the anode during
the electrolysis of water?
Answer: Oxygen.
Question 10: Why is the process of electroplating
useful?
Answer: It enhances the appearance and prevents
corrosion of objects.
Question 11: Can pure water conduct electricity?
Answer: No, it is a poor conductor.
Question 12: What is the purpose of adding impurities
to water to make it conducting?
Answer: To create ions for conduction of electricity.
Question 13: What is the function of electrolytes in
an electrolytic cell?
Answer: They provide ions for the conduction of electricity.
Question 14: Which electrode is connected to the
positive terminal of the battery during electroplating?
Answer: Object to be plated.
Question 15: What is the product of the electrolysis
of water?
Answer: Hydrogen gas and oxygen gas.
Question 16: Name the process used for obtaining a
metal from its oxide.
Answer: Reduction.
Question 17: What is the unit of electric current?
Answer: Ampere (A).
Question 18: Name a liquid that does not conduct
electricity.
Answer: Cooking oil.
Question 19: Why do we need to clean the object
before electroplating it?
Answer: To remove dirt and ensure proper adhesion of
the plated layer.
Question 20: Which metal is often used as the
electrode in electrorefining of metals like copper?
Answer: Copper.
******************------------------------------**************************------------------------------------
10 two-marks short
answer questions related to the chapter "Chemical Effects of Electric
Current" along with their brief answers:
Question 1: Explain why metals are good conductors of
electricity.
Answer: Metals are good conductors because they have
free electrons in their outermost shells that can move easily, allowing the
flow of electric current.
Question 2: How does the chemical effect of electric
current help in electroplating?
Answer: In electroplating, the metal to be plated
acts as the cathode, and metal ions from the solution are reduced and deposited
on the cathode, forming a layer and enhancing the object's properties.
Question 3: Why is copper usually used for making
electrical wires?
Answer: Copper is used for wires because it is an
excellent conductor of electricity, has low resistance, and does not corrode
easily, ensuring efficient and durable electrical connections.
Question 4: What happens when electricity is passed
through water? Write the chemical equation for the reaction that takes place.
Answer: Water undergoes electrolysis, forming
hydrogen gas at the cathode and oxygen gas at the anode. The chemical equation
is: 2�2�(�)→2�2(�)+�2(�)2H2O(l)→2H2(g)+O2(g).
Question 5: Why is electroplating done on objects
made of iron?
Answer: Electroplating is done on iron objects to
prevent them from rusting. A layer of a more reactive metal like zinc is plated
on the iron, acting as a protective barrier against corrosion.
Question 6: Explain why pure water does not conduct
electricity, but a solution of salt in water does.
Answer: Pure water does not conduct electricity
because it lacks ions. Saltwater, on the other hand, contains dissolved ions,
allowing the flow of electric current.
Question 7: How does the process of electrorefining
purify impure metals?
Answer: Electrorefining involves the electrolysis of
impure metal to dissolve it at the anode and deposit pure metal at the cathode,
purifying it by removing impurities.
Question 8: What safety precautions should be taken
while working with electricity in a laboratory?
Answer: Safety precautions include wearing rubber
gloves, using insulated tools, ensuring dry conditions, and avoiding contact
with water to prevent electric shocks.
Question 9: Why do metal objects plated with gold
retain their shine and do not corrode easily?
Answer: Gold-plated objects do not corrode easily
because gold is highly unreactive, and the thin layer of gold acts as a
protective barrier, preventing oxidation and corrosion of the underlying metal.
Question 10: Explain the role of electrolytes in the
conduction of electricity in liquids.
Answer: Electrolytes dissociate into ions in
solution, allowing the flow of electric current. The movement of these ions
facilitates the conduction of electricity in liquids.
******************------------------------------**************************------------------------------------
10 three-marks long
answer questions related to the chapter "Chemical Effects of Electric
Current" along with their detailed answers:
Question 1: Describe the process of electroplating.
Explain its applications and importance in daily life.
Answer: Electroplating is the process of depositing a
thin layer of metal on an object using electricity. It finds applications in
enhancing the appearance of objects, preventing corrosion, and creating
conductive surfaces in electronics. For instance, it's used in making
decorative items, jewelry, and coating car parts, making objects more durable
and aesthetically pleasing.
Question 2: Explain why water from rivers and lakes
conducts electricity while pure water does not.
Answer: Water from rivers and lakes contains
dissolved salts and minerals, forming ions that allow the conduction of
electricity. Pure water lacks these ions, making it a poor conductor. The
presence of impurities in natural water sources enables the flow of electric
current.
Question 3: Describe an experiment to show that
electricity can pass through a solution and decompose it into its constituents.
Answer: One can set up a simple electrolysis experiment
using a solution (e.g., water) and two electrodes (usually copper or carbon
rods). Passing electric current through the solution results in the
decomposition of water into hydrogen and oxygen gases, collected at the cathode
and anode respectively.
Question 4: Explain why the process of electroplating
is essential in the preservation of certain metal objects.
Answer: Electroplating provides a protective layer on
metal objects, preventing them from rusting or corroding. For example, iron
objects are often electroplated with zinc to form a zinc coating, which acts as
a barrier against moisture and corrosion, extending the lifespan of the object.
Question 5: Discuss the safety precautions that need
to be taken while working with electricity in laboratories and homes.
Answer: Safety precautions include wearing rubber
gloves, using insulated tools, ensuring dry conditions, turning off the power
supply before working, and avoiding contact with water. These measures prevent
electric shocks and accidents, ensuring safe working conditions.
Question 6: Explain why gold and silver are not used
for making electrical wires, while copper and aluminum are preferred.
Answer: Gold and silver are excellent conductors, but
they are expensive. Copper and aluminum are also good conductors and
cost-effective. Hence, they are preferred for making electrical wires,
balancing conductivity and cost efficiency.
Question 7: Describe the process of electrorefining
with the help of an example. Explain its significance in obtaining pure metals.
Answer: Electrorefining involves dissolving an impure
metal (e.g., copper) at the anode and depositing pure metal at the cathode.
During electrolysis, impurities settle down, and pure metal is collected,
ensuring high purity. Electrorefining is vital in obtaining pure metals for
various industrial applications.
Question 8: Explain why metals like sodium and potassium
are stored in kerosene oil.
Answer: Sodium and potassium are highly reactive with
moisture and air. Storing them in kerosene oil prevents their exposure to these
elements, ensuring they remain chemically unreactive and do not react with
oxygen or water vapor in the air.
Question 9: Discuss the impact of electroplating on
the environment. Mention any measures that can be taken to minimize the
environmental impact.
Answer: Electroplating can lead to environmental
pollution due to the disposal of chemicals. Proper waste management, recycling
of plating solutions, and implementing wastewater treatment methods are
crucial. Additionally, using eco-friendly plating processes and materials can
minimize environmental harm.
Question 10: Explain the role of electrolysis in the
process of electroplating. How does the choice of electrolyte affect the
quality of electroplated objects?
Answer: Electrolysis in electroplating involves the reduction
of metal ions at the cathode, forming a plated layer. The choice of electrolyte
affects the plating process and the quality of the plated object. An
appropriate electrolyte provides the desired metal ions for deposition,
ensuring a smooth, uniform, and adherent coating, enhancing the quality of
electroplated objects.
******************------------------------------**************************------------------------------------
10 Five-marks long
answer questions related to the chapter "Chemical Effects of Electric
Current" along with their detailed answers:
Question 1: Explain the process of electrolysis.
Provide an example of an electrolytic cell and discuss the reactions occurring
at the anode and cathode.
Answer: Electrolysis is the process of using electric
current to drive a non-spontaneous chemical reaction. For example, in the
electrolysis of water, when a direct current is passed through water, it
decomposes into hydrogen gas at the cathode and oxygen gas at the anode. At the
cathode, 2�2�(�)+2�−→�2(�)+2��−(��)2H2O(l)+2e−→H2(g)+2OH−(aq),
and at the anode, 2�2�(�)→�2(�)+4�+(��)+4�−2H2O(l)→O2(g)+4H+(aq)+4e−.
Question 2: Discuss the concept of conductivity.
Explain why some substances conduct electricity while others do not.
Answer: Conductivity is the ability of a substance to
allow electric current to pass through it. Substances conduct electricity when
they have free-moving ions or electrons. For example, acids, bases, and salts
in their aqueous forms are conductive due to the presence of ions. In contrast,
pure water, oils, and non-metallic solids do not conduct electricity because
they lack free ions or electrons.
Question 3: Describe an experiment to demonstrate the
chemical effect of electric current. Include the materials required and the
observations made during the experiment.
Answer: One experiment involves the electrolysis of
copper sulfate solution using copper electrodes. When a direct current is
passed, copper gets deposited at the cathode (positive electrode) and copper
ions dissolve at the anode (negative electrode). The cathode gains mass, while
the anode loses mass due to the dissolution of copper ions.
Question 4: Explain the process of electrorefining
with the help of an example. How does it help in obtaining pure metals?
Answer: Electrorefining involves the electrolysis of
impure metal to dissolve it at the anode and deposit pure metal at the cathode.
For instance, in the electrorefining of copper, impure copper acts as the
anode, dissolving to form copper ions, which then plate onto a pure copper
cathode. This process removes impurities, resulting in high-purity copper for
industrial use.
Question 5: Discuss the applications of
electroplating in different industries. How does electroplating benefit these
industries?
Answer: Electroplating is widely used in industries
such as jewelry, automobile, and electronics. In jewelry, it enhances
aesthetics; in the automobile industry, it prevents corrosion, and in
electronics, it creates conductive layers. Electroplating provides a protective
coating, enhancing durability and appearance in various products.
Question 6: Explain the factors affecting the quality
of electroplated objects. What measures can be taken to improve the quality of
electroplated products?
Answer: Factors affecting electroplated objects
include temperature, current density, cleanliness, and composition of plating
solution. Quality can be improved by ensuring proper cleaning of objects,
maintaining appropriate current density, regulating bath temperature, and using
high-quality plating solutions, resulting in uniform and smooth coatings.
Question 7: Discuss the importance of electrolysis in
various industrial processes. Provide examples of industrial applications where
electrolysis is essential.
Answer: Electrolysis is vital in industries for
various applications. In the production of aluminum, electrolysis is used to
extract pure aluminum from aluminum oxide. Similarly, electrolysis is crucial
in the chlor-alkali industry for producing chlorine gas, hydrogen gas, and
sodium hydroxide, essential chemicals for numerous industrial processes.
Question 8: Explain why copper wires are preferred
over iron wires in electrical connections. How does the chemical property of
copper contribute to its suitability for this purpose?
Answer: Copper wires are preferred over iron wires
due to copper's excellent conductivity, low resistance, and resistance to
corrosion. Copper does not corrode easily, ensuring stable and efficient
electrical connections. Its high conductivity allows the smooth flow of
electric current, making it ideal for various electrical applications.
Question 9: Discuss the environmental impact of
electroplating. What measures can industries adopt to minimize the
environmental consequences of electroplating processes?
Answer: Electroplating can lead to environmental
pollution due to chemical discharge. Industries can adopt closed-loop systems,
proper waste disposal, and use eco-friendly plating solutions. Effluent
treatment plants can help in treating wastewater, ensuring that harmful
chemicals do not contaminate natural water bodies.
Question 10: Explain the safety precautions that
should be followed while working with electrolytes and electrical equipment.
Why is it essential to follow these precautions?
Answer: Safety precautions include wearing protective
gear, working in dry conditions, and using insulated tools. It's crucial to
prevent accidents, including electric shocks and chemical exposure. Following
these precautions ensures the well-being of workers, minimizing the risks
associated with working with electrolytes and electrical equipment.
******************------------------------------**************************------------------------------------
Multiple-Choice Questions (MCQs): Set 1
*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-
Multiple-Choice Questions (MCQs): Set 2
******************------------------------------**************************------------------------------------
Assertion and
Reasoning Question
******************------------------------------**************************------------------------------------
Assertion and
Reasoning Question
******************------------------------------**************************------------------------------------
Case Study 1: Electroplating in Everyday Life
Case Study: A jewelry workshop in your town
specializes in electroplating gold and silver jewelry. The owner uses this
technique not only for enhancing the aesthetics of the jewelry but also to
prevent tarnishing and corrosion. Analyze the process and its applications in
different types of jewelry.
Questions:
- Question:
Why is electroplating commonly used in the jewelry industry?
Answer: Electroplating is used in the jewelry
industry to enhance the appearance of jewelry items and prevent tarnishing and
corrosion. A thin layer of metal is deposited on the surface of jewelry items
using this technique.
- Question:
How does electroplating prevent jewelry from tarnishing?
Answer: Electroplating creates a protective layer on
jewelry, preventing direct contact with air and moisture, which are the causes
of tarnishing. The plated layer acts as a barrier, preserving the original
shine of the jewelry.
- Question:
Mention one other industry where electroplating is commonly used and
explain its purpose.
Answer: Electroplating is commonly used in the
automotive industry. It is applied on car parts to prevent corrosion, improve
durability, and enhance the visual appeal of vehicles.
- Question:
What precautions should be taken while performing electroplating in a
workshop?
Answer: Safety measures such as wearing gloves,
safety goggles, and proper ventilation are essential during electroplating.
Workers should avoid direct contact with chemicals and be trained in handling
equipment safely.
- Question:
Can you think of an environmental concern related to electroplating?
Explain.
Answer: Yes, one environmental concern is the
disposal of chemicals used in electroplating. Proper disposal methods need to
be employed to prevent contamination of soil and water sources.
******************------------------------------**************************------------------------------------
Case Study 2: Electrolysis for Metal Extraction
Case Study: A metal extraction plant in your region
uses electrolysis to obtain pure metals from their ores. Explore the
electrolytic process used in the plant and its significance in the production
of various metals.
Questions:
- Question:
How does electrolysis assist in the extraction of metals from their ores?
Answer: Electrolysis breaks down metal compounds in
ores into their constituent elements using electricity. It separates the metal
ions from the compound, allowing the extraction of pure metals.
- Question:
What is the role of electrodes in the process of electrolysis?
Answer: Electrodes conduct electricity into the
electrolyte. The positive electrode (anode) attracts negatively charged ions
(anions), and the negative electrode (cathode) attracts positively charged ions
(cations), allowing the separation of elements.
- Question:
Explain one application of electrolysis in the production of a specific
metal.
Answer: Electrolysis is used in the production of
aluminum. Aluminum oxide dissolved in molten cryolite undergoes electrolysis,
resulting in the extraction of pure aluminum at the cathode.
- Question:
Why is it important to obtain metals in their pure form for industrial
applications?
Answer: Pure metals have desirable properties such as
high conductivity and malleability, making them essential for various
industrial applications, including electronics and construction.
- Question:
Can you name another method used for metal extraction besides
electrolysis? Explain briefly.
Answer: Yes, another method is smelting, where metal
ores are heated in a furnace with a reducing agent to extract the metal. The
metal melts and is collected as it flows out of the furnace.
******************------------------------------**************************------------------------------------
Case Study 3: Electrolysis in Water Treatment
Case Study: A water treatment plant in your city uses
electrolysis to disinfect water and make it safe for consumption. Investigate
the electrolytic process used and its role in providing clean drinking water.
Questions:
- Question:
How does electrolysis disinfect water, making it safe for consumption?
Answer: Electrolysis produces chlorine gas, which is
a strong disinfectant. When dissolved in water, it forms hypochlorous acid,
killing bacteria and other harmful microorganisms, making the water safe to
drink.
- Question:
What is the significance of disinfecting water before it reaches
households?
Answer: Disinfecting water is essential to prevent
waterborne diseases. It ensures that the water supply is free from harmful
microorganisms, safeguarding public health.
- Question:
Are there any by-products of electrolytic water disinfection? Explain.
Answer: Yes, one by-product is hydrogen gas. Hydrogen
gas is formed at the cathode during the electrolysis of water. It can be collected
and utilized as a source of energy.
- Question:
What safety measures should be taken when handling chlorine gas during the
electrolysis process?
Answer: Workers should wear appropriate protective
gear such as masks and gloves when handling chlorine gas. Proper ventilation in
the area is crucial to prevent the accumulation of the gas.
- Question:
Can you suggest an alternative method for water disinfection besides
electrolysis? Explain briefly.
Answer: Yes, another method is ultraviolet (UV)
disinfection, where water is exposed to UV light, killing or inactivating
microorganisms present in the water.
******************------------------------------**************************------------------------------------
Case Study 4: Electrolysis in Electroplating Industries
Case Study: An electroplating factory in your town
utilizes electrolysis for coating metal products. Explore the various
applications of electroplating in different industries and its impact on the
quality of products.
Questions:
- Question:
How does electroplating enhance the quality and durability of metal
products?
Answer: Electroplating forms a protective layer on
metal products, preventing corrosion and wear. It enhances the appearance,
durability, and longevity of products.
- Question:
Name two industries other than jewelry where electroplating is widely
used. Explain its purpose in each industry.
Answer: Electroplating is used in the automotive
industry to prevent corrosion on car parts. It is also used in the electronics
industry to create conductive layers on components.
- Question:
What is the role of electric current in the electroplating process?
Answer: Electric current helps in the deposition of
metal ions onto the surface of the object being electroplated. It facilitates
the formation of a uniform and adherent metal coating.
- Question:
Why is it important to clean the object thoroughly before electroplating?
Answer: Thorough cleaning removes dirt, oil, and
other impurities from the object's surface. Clean surfaces ensure proper
adhesion of the plated layer and prevent defects in the coating.
- Question:
Can you think of an environmental concern related to electroplating?
Explain.
Answer: Yes, one concern is the disposal of
electroplating chemicals, which can contaminate soil and water if not managed
properly. Effluent treatment methods are essential to mitigate environmental
impact.
******************------------------------------**************************------------------------------------
Case Study 5: Electrolysis in Electrorefining of Metals
Case Study: A metallurgical plant in your area uses
electrolysis for the electrorefining of copper. Explore the electrorefining
process and its significance in obtaining high-purity copper for industrial
applications.
Questions:
- Question:
How does electrorefining improve the purity of copper obtained from ores?
Answer: Electrorefining dissolves impure copper from
the anode into the electrolyte. Pure copper is deposited at the cathode,
resulting in high-purity copper.
- Question:
Explain why impurities settle at the bottom of the electrolytic cell
during electrorefining.
Answer: Impurities in the copper being refined have
higher density than copper. Therefore, they settle at the bottom of the cell,
separating from the pure copper.
- Question:
Why is the copper obtained through electrorefining considered high-quality
for electrical applications?
Answer: Electrorefined copper is highly pure, with
low impurity levels. This purity ensures excellent electrical conductivity,
making it ideal for electrical and electronic applications.
- Question:
What is the role of the electrolyte in the electrorefining process?
Answer: The electrolyte provides copper ions for the
conduction of electricity. It enables the movement of copper ions from the
anode to the cathode during electrorefining.
- Question:
Can you name another metal that is refined using the electrorefining
process? Explain briefly.
Answer: Yes, another metal refined through
electrorefining is silver. It is used to obtain pure silver for various
applications, including jewelry and coins.
******************------------------------------**************************------------------------------------
These case studies and questions provide students with a
comprehensive understanding of the applications and significance of
electrolysis and electroplating processes in different industries and contexts.