ELECTROLYSIS AND ELECTROCHEMICAL CELL FLASHCARDS
Student Portal / Assessment Result
Assessment Result
Techlinx School Manager v11 Student Portal · 2026/2027 · 1st Term
CHEMISTRY
Week 3 Home Assessment
Attempt #1
48.00%
Passed
12.00 / 25.00
Corrections
Question 1Incorrect
What happens at the cathode during electrolysis?
Your answer
No answer
Correct answer
B
Explanation: Reduction occurs at the cathode because positively charged ions gain electrons there.
Question 2Correct
If the current passed through an electrolytic cell is doubled while the time remains constant, the mass deposited will
Your answer
C
Correct answer
C
Explanation: Since mass deposited is proportional to current when time is constant, doubling the current doubles the mass deposited.
Question 3Incorrect
How can agricultural water pollution be reduced?
Your answer
No answer
Correct answer
C
Explanation: Proper and controlled use of fertilizers and pesticides reduces the amount of agricultural pollutants entering water bodies.
Question 4Correct
Why should vegetation be maintained around water bodies?
Your answer
A
Correct answer
A
Explanation: Vegetation can reduce soil erosion and trap some pollutants before they reach rivers and other water bodies.
Question 5Correct
What is an electrode?
Your answer
B
Correct answer
B
Explanation: An electrode is a conductor through which electric current enters or leaves the electrolyte.
Question 6Correct
Which agricultural activity can contribute significantly to water pollution?
Your answer
B
Correct answer
B
Explanation: Excess fertilizers can be washed into rivers and lakes, introducing nutrients that may cause pollution.
Question 7Correct
In a galvanic cell, electrons flow through the external circuit from the
Your answer
B
Correct answer
B
Explanation: Electrons are produced at the anode and flow through the external circuit to the cathode.
Question 8Correct
Why is dumping refuse into rivers harmful?
Your answer
B
Correct answer
B
Explanation: Refuse can release harmful substances and microorganisms into water, making the water polluted and unsafe.
Question 9Incorrect
Which factor determines the amount of substance deposited during electrolysis according to Faraday's first law?
Your answer
No answer
Correct answer
A
Explanation: The mass deposited depends directly on the quantity of electricity passed through the electrolyte.
Question 10Correct
According to Faraday's first law of electrolysis, the mass of a substance deposited during electrolysis is directly proportional to the
Your answer
B
Correct answer
B
Explanation: Faraday's first law states that the mass deposited is directly proportional to the quantity of electricity passed.
Question 11Incorrect
Which of the following is a strong electrolyte?
Your answer
No answer
Correct answer
C
Explanation: Sodium chloride ionises completely in aqueous solution, making it a strong electrolyte.
Question 12Incorrect
What is the main difference between galvanic and electrolytic cells?
Your answer
No answer
Correct answer
B
Explanation: Galvanic cells convert chemical energy into electrical energy, while electrolytic cells use electrical energy to drive chemical reactions.
Question 13Incorrect
Which of the following is an application of galvanic cells?
Your answer
No answer
Correct answer
C
Explanation: Galvanic cells produce electrical energy and are used in batteries that power portable devices.
Question 14Correct
During electrolysis, the electrode connected to the positive terminal of a direct-current source is called the
Your answer
B
Correct answer
B
Explanation: In an electrolytic cell, the anode is connected to the positive terminal of the power supply.
Question 15Incorrect
Which heavy metal can cause serious health problems when present in contaminated water?
Your answer
No answer
Correct answer
A
Explanation: Lead is a toxic heavy metal that can cause serious health effects when humans are exposed to contaminated water.
Question 16Incorrect
In a zinc-copper galvanic cell, copper ions are reduced at the
Your answer
No answer
Correct answer
B
Explanation: Copper ions gain electrons at the copper electrode and are reduced to copper metal.
Question 17Incorrect
A current of 5 A is passed through an electrolyte for 20 minutes. What quantity of electricity passes through the electrolyte?
Your answer
No answer
Correct answer
C
Explanation: Q = It = 5 × (20 × 60) = 6,000 C.
Question 18Correct
Which statement about both galvanic and electrolytic cells is correct?
Your answer
C
Correct answer
C
Explanation: The anode is always the site of oxidation and the cathode is always the site of reduction, although their polarities differ between the two cell types.
Question 19Incorrect
Which process is an application of an electrolytic cell?
Your answer
B
Correct answer
A
Explanation: Electroplating uses electrical energy to deposit a metal coating onto another material.
Question 20Correct
Which of the following can be used to control oil pollution in water?
Your answer
B
Correct answer
B
Explanation: Oil containment barriers can prevent the spread of oil, while appropriate cleanup methods remove the spilled oil.
Question 21Incorrect
Which of the following is a major source of water pollution?
Your answer
No answer
Correct answer
A
Explanation: Industrial effluents may contain harmful chemicals and heavy metals that contaminate water bodies.
Question 22Incorrect
Which of the following correctly describes the energy conversion in an electrolytic cell?
Your answer
No answer
Correct answer
A
Explanation: An electrolytic cell uses electrical energy to drive and store energy in chemical changes.
Question 23Correct
How does oil pollution affect aquatic organisms?
Your answer
C
Correct answer
C
Explanation: Oil can form a layer on the water surface, interfering with oxygen exchange and harming aquatic organisms.
Question 24Incorrect
What is one environmental effect of persistent water pollution?
Your answer
No answer
Correct answer
A
Explanation: Persistent pollution can damage aquatic habitats and reduce the number and variety of organisms living there.
Question 25Correct
WhaStudent Portal / Assessment Result
Assessment Result
Techlinx School Manager v11 Student Portal · 2026/2027 · 1st Term
CHEMISTRY
Week 3 Home Assessment
Attempt #1
48.00%
Passed
12.00 / 25.00
Corrections
Question 1Incorrect
What happens at the cathode during electrolysis?
Your answer
No answer
Correct answer
B
Explanation: Reduction occurs at the cathode because positively charged ions gain electrons there.
Question 2Correct
If the current passed through an electrolytic cell is doubled while the time remains constant, the mass deposited will
Your answer
C
Correct answer
C
Explanation: Since mass deposited is proportional to current when time is constant, doubling the current doubles the mass deposited.
Question 3Incorrect
How can agricultural water pollution be reduced?
Your answer
No answer
Correct answer
C
Explanation: Proper and controlled use of fertilizers and pesticides reduces the amount of agricultural pollutants entering water bodies.
Question 4Correct
Why should vegetation be maintained around water bodies?
Your answer
A
Correct answer
A
Explanation: Vegetation can reduce soil erosion and trap some pollutants before they reach rivers and other water bodies.
Question 5Correct
What is an electrode?
Your answer
B
Correct answer
B
Explanation: An electrode is a conductor through which electric current enters or leaves the electrolyte.
Question 6Correct
Which agricultural activity can contribute significantly to water pollution?
Your answer
B
Correct answer
B
Explanation: Excess fertilizers can be washed into rivers and lakes, introducing nutrients that may cause pollution.
Question 7Correct
In a galvanic cell, electrons flow through the external circuit from the
Your answer
B
Correct answer
B
Explanation: Electrons are produced at the anode and flow through the external circuit to the cathode.
Question 8Correct
Why is dumping refuse into rivers harmful?
Your answer
B
Correct answer
B
Explanation: Refuse can release harmful substances and microorganisms into water, making the water polluted and unsafe.
Question 9Incorrect
Which factor determines the amount of substance deposited during electrolysis according to Faraday's first law?
Your answer
No answer
Correct answer
A
Explanation: The mass deposited depends directly on the quantity of electricity passed through the electrolyte.
Question 10Correct
According to Faraday's first law of electrolysis, the mass of a substance deposited during electrolysis is directly proportional to the
Your answer
B
Correct answer
B
Explanation: Faraday's first law states that the mass deposited is directly proportional to the quantity of electricity passed.
Question 11Incorrect
Which of the following is a strong electrolyte?
Your answer
No answer
Correct answer
C
Explanation: Sodium chloride ionises completely in aqueous solution, making it a strong electrolyte.
Question 12Incorrect
What is the main difference between galvanic and electrolytic cells?
Your answer
No answer
Correct answer
B
Explanation: Galvanic cells convert chemical energy into electrical energy, while electrolytic cells use electrical energy to drive chemical reactions.
Question 13Incorrect
Which of the following is an application of galvanic cells?
Your answer
No answer
Correct answer
C
Explanation: Galvanic cells produce electrical energy and are used in batteries that power portable devices.
Question 14Correct
During electrolysis, the electrode connected to the positive terminal of a direct-current source is called the
Your answer
B
Correct answer
B
Explanation: In an electrolytic cell, the anode is connected to the positive terminal of the power supply.
Question 15Incorrect
Which heavy metal can cause serious health problems when present in contaminated water?
Your answer
No answer
Correct answer
A
Explanation: Lead is a toxic heavy metal that can cause serious health effects when humans are exposed to contaminated water.
Question 16Incorrect
In a zinc-copper galvanic cell, copper ions are reduced at the
Your answer
No answer
Correct answer
B
Explanation: Copper ions gain electrons at the copper electrode and are reduced to copper metal.
Question 17Incorrect
A current of 5 A is passed through an electrolyte for 20 minutes. What quantity of electricity passes through the electrolyte?
Your answer
No answer
Correct answer
C
Explanation: Q = It = 5 × (20 × 60) = 6,000 C.
Question 18Correct
Which statement about both galvanic and electrolytic cells is correct?
Your answer
C
Correct answer
C
Explanation: The anode is always the site of oxidation and the cathode is always the site of reduction, although their polarities differ between the two cell types.
Question 19Incorrect
Which process is an application of an electrolytic cell?
Your answer
B
Correct answer
A
Explanation: Electroplating uses electrical energy to deposit a metal coating onto another material.
Question 20Correct
Which of the following can be used to control oil pollution in water?
Your answer
B
Correct answer
B
Explanation: Oil containment barriers can prevent the spread of oil, while appropriate cleanup methods remove the spilled oil.
Question 21Incorrect
Which of the following is a major source of water pollution?
Your answer
No answer
Correct answer
A
Explanation: Industrial effluents may contain harmful chemicals and heavy metals that contaminate water bodies.
Question 22Incorrect
Which of the following correctly describes the energy conversion in an electrolytic cell?
Your answer
No answer
Correct answer
A
Explanation: An electrolytic cell uses electrical energy to drive and store energy in chemical changes.
Question 23Correct
How does oil pollution affect aquatic organisms?
Your answer
C
Correct answer
C
Explanation: Oil can form a layer on the water surface, interfering with oxygen exchange and harming aquatic organisms.
Question 24Incorrect
What is one environmental effect of persistent water pollution?
Your answer
No answer
Correct answer
A
Explanation: Persistent pollution can damage aquatic habitats and reduce the number and variety of organisms living there.
Question 25Correct
WhaStudent Portal / Assessment Result
Assessment Result
Techlinx School Manager v11 Student Portal · 2026/2027 · 1st Term
CHEMISTRY
Week 3 Home Assessment
Attempt #1
48.00%
Passed
12.00 / 25.00
Corrections
Question 1Incorrect
What happens at the cathode during electrolysis?
Your answer
No answer
Correct answer
B
Explanation: Reduction occurs at the cathode because positively charged ions gain electrons there.
Question 2Correct
If the current passed through an electrolytic cell is doubled while the time remains constant, the mass deposited will
Your answer
C
Correct answer
C
Explanation: Since mass deposited is proportional to current when time is constant, doubling the current doubles the mass deposited.
Question 3Incorrect
How can agricultural water pollution be reduced?
Your answer
No answer
Correct answer
C
Explanation: Proper and controlled use of fertilizers and pesticides reduces the amount of agricultural pollutants entering water bodies.
Question 4Correct
Why should vegetation be maintained around water bodies?
Your answer
A
Correct answer
A
Explanation: Vegetation can reduce soil erosion and trap some pollutants before they reach rivers and other water bodies.
Question 5Correct
What is an electrode?
Your answer
B
Correct answer
B
Explanation: An electrode is a conductor through which electric current enters or leaves the electrolyte.
Question 6Correct
Which agricultural activity can contribute significantly to water pollution?
Your answer
B
Correct answer
B
Explanation: Excess fertilizers can be washed into rivers and lakes, introducing nutrients that may cause pollution.
Question 7Correct
In a galvanic cell, electrons flow through the external circuit from the
Your answer
B
Correct answer
B
Explanation: Electrons are produced at the anode and flow through the external circuit to the cathode.
Question 8Correct
Why is dumping refuse into rivers harmful?
Your answer
B
Correct answer
B
Explanation: Refuse can release harmful substances and microorganisms into water, making the water polluted and unsafe.
Question 9Incorrect
Which factor determines the amount of substance deposited during electrolysis according to Faraday's first law?
Your answer
No answer
Correct answer
A
Explanation: The mass deposited depends directly on the quantity of electricity passed through the electrolyte.
Question 10Correct
According to Faraday's first law of electrolysis, the mass of a substance deposited during electrolysis is directly proportional to the
Your answer
B
Correct answer
B
Explanation: Faraday's first law states that the mass deposited is directly proportional to the quantity of electricity passed.
Question 11Incorrect
Which of the following is a strong electrolyte?
Your answer
No answer
Correct answer
C
Explanation: Sodium chloride ionises completely in aqueous solution, making it a strong electrolyte.
Question 12Incorrect
What is the main difference between galvanic and electrolytic cells?
Your answer
No answer
Correct answer
B
Explanation: Galvanic cells convert chemical energy into electrical energy, while electrolytic cells use electrical energy to drive chemical reactions.
Question 13Incorrect
Which of the following is an application of galvanic cells?
Your answer
No answer
Correct answer
C
Explanation: Galvanic cells produce electrical energy and are used in batteries that power portable devices.
Question 14Correct
During electrolysis, the electrode connected to the positive terminal of a direct-current source is called the
Your answer
B
Correct answer
B
Explanation: In an electrolytic cell, the anode is connected to the positive terminal of the power supply.
Question 15Incorrect
Which heavy metal can cause serious health problems when present in contaminated water?
Your answer
No answer
Correct answer
A
Explanation: Lead is a toxic heavy metal that can cause serious health effects when humans are exposed to contaminated water.
Question 16Incorrect
In a zinc-copper galvanic cell, copper ions are reduced at the
Your answer
No answer
Correct answer
B
Explanation: Copper ions gain electrons at the copper electrode and are reduced to copper metal.
Question 17Incorrect
A current of 5 A is passed through an electrolyte for 20 minutes. What quantity of electricity passes through the electrolyte?
Your answer
No answer
Correct answer
C
Explanation: Q = It = 5 × (20 × 60) = 6,000 C.
Question 18Correct
Which statement about both galvanic and electrolytic cells is correct?
Your answer
C
Correct answer
C
Explanation: The anode is always the site of oxidation and the cathode is always the site of reduction, although their polarities differ between the two cell types.
Question 19Incorrect
Which process is an application of an electrolytic cell?
Your answer
B
Correct answer
A
Explanation: Electroplating uses electrical energy to deposit a metal coating onto another material.
Question 20Correct
Which of the following can be used to control oil pollution in water?
Your answer
B
Correct answer
B
Explanation: Oil containment barriers can prevent the spread of oil, while appropriate cleanup methods remove the spilled oil.
Question 21Incorrect
Which of the following is a major source of water pollution?
Your answer
No answer
Correct answer
A
Explanation: Industrial effluents may contain harmful chemicals and heavy metals that contaminate water bodies.
Question 22Incorrect
Which of the following correctly describes the energy conversion in an electrolytic cell?
Your answer
No answer
Correct answer
A
Explanation: An electrolytic cell uses electrical energy to drive and store energy in chemical changes.
Question 23Correct
How does oil pollution affect aquatic organisms?
Your answer
C
Correct answer
C
Explanation: Oil can form a layer on the water surface, interfering with oxygen exchange and harming aquatic organisms.
Question 24Incorrect
What is one environmental effect of persistent water pollution?
Your answer
No answer
Correct answer
A
Explanation: Persistent pollution can damage aquatic habitats and reduce the number and variety of organisms living there.
Question 25Correct
What is the main purpose of electrolysis?
Your answer
A
Correct answer
A
Explanation: Electrolysis uses electrical energy to drive a chemical decomposition or other chemical change.
t is the main purpose of electrolysis?
Your answer
A
Correct answer
A
Explanation: Electrolysis uses electrical energy to drive a chemical decomposition or other chemical change.
t is the main purpose of electrolysis?
Your answer
A
Correct answer
A
Explanation: Electrolysis uses electrical energy to drive a chemical decomposition or other chemical change.