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Questions and Answers
A student dips the free ends of a circuit tester into a beaker of solution. The magnetic needle deflects. What does this indicate about the solution?
A student dips the free ends of a circuit tester into a beaker of solution. The magnetic needle deflects. What does this indicate about the solution?
- The solution is a semiconductor.
- The solution is a good conductor of electricity. (correct)
- The solution is pure, distilled water.
- The solution is an insulator.
Which of the following liquids is LEAST likely to cause a deflection in a magnetic needle when tested for conductivity?
Which of the following liquids is LEAST likely to cause a deflection in a magnetic needle when tested for conductivity?
- Vinegar
- Distilled water (correct)
- Tap water
- Lemon juice
A student sets up a circuit with a light bulb and a liquid, but the bulb does not light up. Which of the following is the LEAST likely reason for this?
A student sets up a circuit with a light bulb and a liquid, but the bulb does not light up. Which of the following is the LEAST likely reason for this?
- There is a loose connection in the circuit.
- The liquid is distilled water.
- The bulb is fused.
- The battery is fully charged. (correct)
Pure water is a poor conductor of electricity. What is the MOST effective way to make it conduct electricity?
Pure water is a poor conductor of electricity. What is the MOST effective way to make it conduct electricity?
Why do firefighters typically shut off the main electrical supply to an area before using water hoses to extinguish a fire?
Why do firefighters typically shut off the main electrical supply to an area before using water hoses to extinguish a fire?
A child tests the conductivity of drinking water and seawater. What difference would the child most likely observe, and why?
A child tests the conductivity of drinking water and seawater. What difference would the child most likely observe, and why?
Which term defines the process of using an electric current to coat a metal object with a thin layer of another metal?
Which term defines the process of using an electric current to coat a metal object with a thin layer of another metal?
In an electrolytic cell, which electrode is connected to the positive terminal of the battery and where oxidation occurs?
In an electrolytic cell, which electrode is connected to the positive terminal of the battery and where oxidation occurs?
Why does seawater cause a greater deflection in a compass needle compared to drinking water?
Why does seawater cause a greater deflection in a compass needle compared to drinking water?
Why is it unsafe for an electrician to perform electrical repairs outdoors during heavy rain?
Why is it unsafe for an electrician to perform electrical repairs outdoors during heavy rain?
Paheli found that rainwater deflected a compass needle, even though she expected it to be like distilled water. What is the most likely reason for this?
Paheli found that rainwater deflected a compass needle, even though she expected it to be like distilled water. What is the most likely reason for this?
Which of the following explains why car bumpers are often chromium plated?
Which of the following explains why car bumpers are often chromium plated?
In the purification of copper using electrolysis, why is the impure copper electrode connected to the positive terminal of the battery?
In the purification of copper using electrolysis, why is the impure copper electrode connected to the positive terminal of the battery?
During the electroplating of an iron strip with copper, the iron strip is designated as the cathode. What is the primary purpose of making the iron strip the cathode in this process?
During the electroplating of an iron strip with copper, the iron strip is designated as the cathode. What is the primary purpose of making the iron strip the cathode in this process?
Which of the following is NOT a typical application of electroplating?
Which of the following is NOT a typical application of electroplating?
In the process of electroplating copper onto an iron strip, which of the following components is essential for the setup?
In the process of electroplating copper onto an iron strip, which of the following components is essential for the setup?
Flashcards
Electrode
Electrode
A conductor through which electric current enters or leaves a medium.
Electrolysis
Electrolysis
The process of using electric current to drive a chemical reaction.
LED
LED
A light-emitting diode that converts electricity into light.
Anode
Anode
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Cathode
Cathode
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Electrolyte
Electrolyte
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Good conductor of electricity
Good conductor of electricity
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Distilled water conductivity
Distilled water conductivity
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Seawater vs Drinking Water
Seawater vs Drinking Water
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Risks of Electrical Repairs in Rain
Risks of Electrical Repairs in Rain
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Conductivity of Rainwater
Conductivity of Rainwater
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Electroplating Definition
Electroplating Definition
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Electroplating Process
Electroplating Process
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Copper Purification Process
Copper Purification Process
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Electrolytic Solution for Copper
Electrolytic Solution for Copper
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Electroplated Objects Examples
Electroplated Objects Examples
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Study Notes
Chemical Effects of Electric Current
- Electric current flowing through a solution causes a magnetic needle to deflect, indicating the solution is a conductor.
- Liquids like groundwater, vinegar, and citric juices conduct electricity. Solutions containing salts, either basic or acidic, will conduct electricity.
- Distilled water does not conduct electricity and therefore a bulb in a circuit will not light.
- If a bulb isn't glowing in a setup, possible causes are a broken bulb, a depleted battery, distilled water as the liquid, or a poor connection in the circuit elements or wires.
- Pure water is a poor conductor, but adding impurities like salt, lemon juice, or vinegar improves its conductivity.
- During a fire, electrical systems should be shut down to prevent electrocution hazards and to avoid short circuits; water is a good conductor. This is to protect from electrocution hazards and avoid short circuits.
Electroplating
- Electroplating coats a metal object with a thin layer of another metal using electricity.
- In the electroplating of a copper strip on an iron strip, the iron strip acts as the cathode (negative electrode) and the copper strip is the anode (positive electrode).
- The solution in the electrolytic tank contains copper ions which deposit onto the iron strip, essentially forming a copper coating.
Coastal Region Water Conductivity
- Seawater conducts electricity better than drinking water due to higher salt content. More mineral salts in seawater generate more ions, leading to higher electrical conductivity.
Outdoor Electrical Repairs During Rain
- Electrical repairs outdoors during heavy rain are hazardous; water is a good conductor of electricity.
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Description
Explore the conductivity of solutions and the phenomenon of electroplating. Learn how electric current interacts with different liquids, and the importance of electrical safety. Understand the process of coating metal objects with a thin layer of another metal through electroplating.
