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All questions of Electrochemistry for Year 10 Exam
What is the key role of hydrogen in the manufacturing process of margarine?- a)It acts as a preservative.
- b)It provides a creamy texture.
- c)It enhances the flavor.
- d)It facilitates hydrogenation of oils.
Correct answer is option 'D'. Can you explain this answer?
a)
It acts as a preservative.
b)
It provides a creamy texture.
c)
It enhances the flavor.
d)
It facilitates hydrogenation of oils.
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Arizona Academy answered |
Hydrogen plays a crucial role in the manufacturing of margarine by facilitating the hydrogenation of oils. This process involves adding hydrogen to unsaturated fats to convert them into saturated fats, resulting in a semi-solid consistency ideal for margarine production.
What type of compounds can undergo electrolysis when an electric current flows through them?- a)Covalent compounds
- b)Ionic compounds
- c)Metallic compounds
- d)Organic compounds
Correct answer is option 'B'. Can you explain this answer?
a)
Covalent compounds
b)
Ionic compounds
c)
Metallic compounds
d)
Organic compounds
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Arizona Academy answered |
Ionic compounds are capable of undergoing electrolysis when an electric current passes through them. This is because ionic compounds can dissociate into ions in molten form or when dissolved in a solution, allowing the movement of ions to carry the electrical charge. This process leads to the decomposition of the compound into its constituent elements.
Where do negative ions, or anions, move within the electrolyte during electrolysis?- a)Cathode
- b)Anode
- c)Power source
- d)Solution
Correct answer is option 'B'. Can you explain this answer?
a)
Cathode
b)
Anode
c)
Power source
d)
Solution
|
|
Arizona Academy answered |
Negative ions, or anions, within the electrolyte move towards the anode during electrolysis. At the anode, these anions release electrons as part of oxidation reactions. This movement of anions towards the anode is a key aspect of electrolysis, contributing to the overall flow of charge and the transformation of chemical species in the electrolyte. Understanding the behavior of anions is essential for comprehending the processes that occur during electrolysis.
What is the function of the cathode in an electrolytic cell?- a)Attract anions
- b)Attract cations
- c)Release electrons
- d)Produce positively charged ions
Correct answer is option 'B'. Can you explain this answer?
a)
Attract anions
b)
Attract cations
c)
Release electrons
d)
Produce positively charged ions
|
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Arizona Academy answered |
The cathode in an electrolytic cell is the electrode that attracts positively charged ions (cations). When the cations reach the cathode, they can gain electrons and undergo reduction reactions, leading to the formation of new substances or the deposition of metals, depending on the specific electrolysis process.
What gas is produced at the negative electrode during the electrolysis of brine?- a)Oxygen gas
- b)Hydrogen gas
- c)Chlorine gas
- d)Nitrogen gas
Correct answer is option 'B'. Can you explain this answer?
a)
Oxygen gas
b)
Hydrogen gas
c)
Chlorine gas
d)
Nitrogen gas
|
|
Arizona Academy answered |
During the electrolysis of brine, hydrogen gas is produced at the negative electrode. This occurs because hydrogen ions (H⁺) are discharged at the cathode due to their lower reactivity compared to sodium ions. These hydrogen ions accept electrons, leading to the formation of hydrogen gas.
What happens at the cathode when metals and hydrogen ions become positively charged ions in an electrolytic cell?- a)Formation of metal or hydrogen gas
- b)Formation of non-metallic substances
- c)Release of electrons
- d)Attraction of negatively charged ions
Correct answer is option 'A'. Can you explain this answer?
a)
Formation of metal or hydrogen gas
b)
Formation of non-metallic substances
c)
Release of electrons
d)
Attraction of negatively charged ions
|
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Arizona Academy answered |
When metals and hydrogen ions become positively charged ions at the cathode in an electrolytic cell, they undergo reduction reactions. This process leads to the formation of either a metal or hydrogen gas at the cathode, depending on the specific ions involved. Reduction at the cathode involves the gain of electrons, resulting in the production of new substances in the electrolysis process.
Which electrode in an electrolytic cell attracts positively charged ions?- a)Anode
- b)Cathode
- c)Electrode
- d)None of the above
Correct answer is option 'A'. Can you explain this answer?
a)
Anode
b)
Cathode
c)
Electrode
d)
None of the above
|
|
Arizona Academy answered |
In an electrolytic cell, the anode is the electrode that attracts negatively charged ions (anions). This is because anions are attracted to the positive electrode (anode) during electrolysis, while cations are attracted to the negative electrode (cathode). Therefore, the anode is where oxidation reactions typically occur.
What is the product formed at the positive electrode when dilute sulfuric acid undergoes electrolysis?- a)Sodium hydroxide solution
- b)Hydrogen gas
- c)Oxygen gas
- d)Chlorine gas
Correct answer is option 'C'. Can you explain this answer?
a)
Sodium hydroxide solution
b)
Hydrogen gas
c)
Oxygen gas
d)
Chlorine gas
|
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Arizona Academy answered |
The product formed at the positive electrode during the electrolysis of dilute sulfuric acid is oxygen gas. This occurs when hydroxide ions (OH⁻) are attracted to the anode, lose electrons, and yield oxygen gas along with water. The production of oxygen gas can be confirmed through specific tests like reigniting a glowing splint.
During the electrolysis of molten lead(II) bromide, what is the product formed at the cathode?- a)Bromine gas
- b)Lead metal
- c)Oxygen gas
- d)Hydrogen gas
Correct answer is option 'B'. Can you explain this answer?
a)
Bromine gas
b)
Lead metal
c)
Oxygen gas
d)
Hydrogen gas
|
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Arizona Academy answered |
When lead(II) bromide is electrolyzed, at the cathode, positive lead ions move to the negative electrode where they gain electrons. This results in the formation of a grey lead metal which deposits on the surface of the cathode. This process illustrates the principle that in electrolysis, the metal is typically produced at the cathode where reduction occurs.
Which electrode material is typically used for the electrolysis of aqueous sodium chloride?- a)Copper
- b)Iron
- c)Platinum
- d)Aluminum
Correct answer is option 'C'. Can you explain this answer?
a)
Copper
b)
Iron
c)
Platinum
d)
Aluminum
|
|
Arizona Academy answered |
In the electrolysis of aqueous sodium chloride, inert electrodes made from materials like platinum or carbon/graphite are commonly used. These electrodes do not react with the electrolyte solution or the products of electrolysis, ensuring a stable and efficient electrolysis process.
During the electrolysis of aqueous sodium chloride, what substance is produced at the anode?- a)Hydrogen gas
- b)Sodium hydroxide
- c)Chlorine gas
- d)Oxygen gas
Correct answer is option 'C'. Can you explain this answer?
a)
Hydrogen gas
b)
Sodium hydroxide
c)
Chlorine gas
d)
Oxygen gas
|
|
Arizona Academy answered |
At the anode during the electrolysis of aqueous sodium chloride, chlorine gas is produced. This occurs due to the oxidation of chloride ions, leading to the formation of elemental chlorine. Chlorine has numerous industrial applications, including in the production of PVC, pesticides, and solvents.
What serves as the charge carriers in the external circuit during electrolysis?- a)Electrons
- b)Protons
- c)Neutrons
- d)Photons
Correct answer is option 'A'. Can you explain this answer?
a)
Electrons
b)
Protons
c)
Neutrons
d)
Photons
|
|
Arizona Academy answered |
Electrons function as the charge carriers in the external circuit during electrolysis. As the electric current flows through the circuit, electrons move from the anode to the cathode, facilitating the transfer of charge and driving various electrochemical reactions. In the external circuit, electrons play a crucial role in conducting electricity and enabling the movement of charge, which is essential for the overall process of electrolysis to occur.
During electrolysis, where do positive ions, or cations, migrate to acquire electrons?- a)Cathode
- b)Anode
- c)Power source
- d)Electrolyte
Correct answer is option 'A'. Can you explain this answer?
a)
Cathode
b)
Anode
c)
Power source
d)
Electrolyte
|
|
Arizona Academy answered |
Positive ions, known as cations, within the electrolyte migrate towards the cathode during electrolysis to acquire electrons. This movement is essential for the charge transfer process to occur effectively. In electrolysis, the cathode attracts positively charged ions, which then gain electrons and undergo reduction reactions. The migration of cations towards the cathode is a fundamental aspect of electrolysis, facilitating various chemical changes and reactions in the process.
What is the role of electrons in the electrolysis process?- a)Transporting ions in the electrolyte
- b)Initiating the flow of electric current
- c)Facilitating charge transfer in the external circuit
- d)Balancing the charge on the cathode
Correct answer is option 'C'. Can you explain this answer?
a)
Transporting ions in the electrolyte
b)
Initiating the flow of electric current
c)
Facilitating charge transfer in the external circuit
d)
Balancing the charge on the cathode
|
|
Arizona Academy answered |
Electrons play a crucial role in facilitating charge transfer in the external circuit during electrolysis. As the electric current flows through the circuit, electrons travel from the anode to the cathode, carrying charge and enabling various electrochemical reactions to occur. In the external circuit, electrons act as the primary carriers of charge, moving through the circuit and participating in redox reactions that drive the electrolysis process forward. Understanding the role of electrons is essential for comprehending how charge transfer occurs in electrolysis.
In the electrolysis of dilute sulfuric acid, what gas is observed at the positive electrode?- a)Hydrogen gas
- b)Oxygen gas
- c)Chlorine gas
- d)Nitrogen gas
Correct answer is option 'B'. Can you explain this answer?
a)
Hydrogen gas
b)
Oxygen gas
c)
Chlorine gas
d)
Nitrogen gas
|
|
Arizona Academy answered |
Oxygen gas is observed at the positive electrode during the electrolysis of dilute sulfuric acid. This gas is produced as hydroxide ions (OH⁻) are attracted to the anode, lose electrons, and yield oxygen gas along with water. The presence of oxygen gas at the anode can be confirmed by reigniting a glowing splint.
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