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Questions and Answers
A student tests a material with a simple circuit. The LED in the circuit lights up brightly. What can be concluded about the material?
A student tests a material with a simple circuit. The LED in the circuit lights up brightly. What can be concluded about the material?
- The material is a conductor with high resistance.
- The material is a semiconductor.
- The material is an insulator with low resistance.
- The material is a conductor with low resistance. (correct)
Why is a compass deflection, without current usage, considered the most effective method for testing a material's conductivity?
Why is a compass deflection, without current usage, considered the most effective method for testing a material's conductivity?
- It can detect very weak currents without altering the conductivity.
- It conserves power compared to methods using electricity. (correct)
- It can be used to test for materials with magnetic properties only.
- It is not an effective method; compasses are unrelated to conductivity.
A solution conducts electricity. The conductivity increases when an acid is added. What is the most likely reason for this?
A solution conducts electricity. The conductivity increases when an acid is added. What is the most likely reason for this?
- The acid removes ions from the solution.
- The acid introduces more ions into the solution. (correct)
- The acid decreases the temperature of the solution.
- The acid introduces free electrons into the solution.
A student observes gas bubbles forming at one of the electrodes during an electrolysis experiment. What does this observation indicate?
A student observes gas bubbles forming at one of the electrodes during an electrolysis experiment. What does this observation indicate?
In a potato experiment, the positive terminal turns green. What does this color change signify?
In a potato experiment, the positive terminal turns green. What does this color change signify?
During electroplating, what role does the anode play in the process?
During electroplating, what role does the anode play in the process?
In electroplating, what characteristic should the electrolyte possess to ensure effective metal deposition?
In electroplating, what characteristic should the electrolyte possess to ensure effective metal deposition?
If you want to electroplate an iron spoon with zinc, which materials would you use for the anode and electrolyte?
If you want to electroplate an iron spoon with zinc, which materials would you use for the anode and electrolyte?
What is the primary reason for electroplating a metal object?
What is the primary reason for electroplating a metal object?
Why is electroplating often employed in the application of gold to other metals?
Why is electroplating often employed in the application of gold to other metals?
Flashcards
Electrical Conductors
Electrical Conductors
Materials that allow electric current to flow through them easily.
Electrical Insulators
Electrical Insulators
Materials that do not allow electric current to flow through them.
Tester (Electricity)
Tester (Electricity)
A partial circuit to determine if a material conducts electricity.
Conductive Liquids
Conductive Liquids
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Chemical Effects of Electric Current
Chemical Effects of Electric Current
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Potato Experiment: Positive Terminal
Potato Experiment: Positive Terminal
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Electroplating
Electroplating
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Anode (Electroplating)
Anode (Electroplating)
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Cathode (Electroplating)
Cathode (Electroplating)
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Purpose of Electroplating
Purpose of Electroplating
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Study Notes
Conductors and Insulators
- Electrical conductors allow current to pass through them.
- Electrical insulators do not allow current to pass through them.
- Electrical conductivity is a material's ability to conduct electric current.
- Good conductors have high electrical conductivity.
- Insulators have low electrical conductivity.
Testers
- A tester is a partial circuit used to test if a material conducts electricity.
- Testers indicate current flow through visual or auditory signals.
- LED glows indicate current flow in a tester circuit.
- Buzzer sound indicates current flow in a tester circuit.
- A magnetic compass deflects near a current-carrying wire.
- Compass deflection without current usage makes it the best tester.
Liquids as Conductors
- Liquids can conduct electricity if they contain ions.
- Tap water, salt solutions, and vinegar are good conductors due to ions.
- Adding acids or salts increases conductivity by introducing ions.
- Distilled water/pure water without has low conductivity.
- Sugar solutions, oil, and petrol are insulators due to lack of ions.
Chemical Effects of Electric Current
- Chemical effects indicated by color change in solution, gas evolution, or metal deposition.
- Change in solution color indicates a chemical effect of current.
- Evolution of gases indicates a chemical effect of current.
- Deposition of metals indicates a chemical effect of current.
Potato Experiment
- Positive terminal in potato turns green, because change in color.
- Green color at the positive terminal is a chemical effect.
Electroplating
- Electroplating is coating one metal over another using electricity.
- Anode is the material connected to the positive terminal.
- Cathode is the material to be plated.
- The electrolyte should contain ions of the anode metal.
- Anode material moves to the cathode for deposition during electroplating in cathode.
Electroplating Example
- To plate with zinc, use a zinc anode and zinc sulfate electrolyte.
- Zinc leaves the anode, enters the electrolyte, and plates the cathode.
Purpose of Electroplating
- Prevents corrosion by protecting the underlying metal.
- Enhances appearance through a shiny coating.
- Used for gold plating due to gold's high cost.
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