Podcast
Questions and Answers
Which electrode is connected to the positive terminal of the battery when producing oxygen bubbles in water?
Which electrode is connected to the positive terminal of the battery when producing oxygen bubbles in water?
- Zinc electrode
- Silver electrode
- Iron electrode
- Copper electrode (correct)
What happens when electrodes are immersed in water and a current is passed through?
What happens when electrodes are immersed in water and a current is passed through?
- Bubbles of oxygen and hydrogen are produced (correct)
- No bubbles are produced
- Bubbles of carbon dioxide are produced
- Bubbles of nitrogen are produced
What are some chemical effects of electric current passing through a conducting solution?
What are some chemical effects of electric current passing through a conducting solution?
- Change in temperature of the solution
- Deposits of metal on electrodes (correct)
- Increase in viscosity of the solution
- Formation of sugar crystals
Why did Boojho notice a greenish blue spot on the potato around one wire after leaving it for half an hour?
Why did Boojho notice a greenish blue spot on the potato around one wire after leaving it for half an hour?
What happens when a potato is cut into two halves and copper wires of a tester are inserted into it?
What happens when a potato is cut into two halves and copper wires of a tester are inserted into it?
What determines the type of reaction that occurs when an electric current passes through a conducting solution?
What determines the type of reaction that occurs when an electric current passes through a conducting solution?
Why does the bulb glow in the tester when the electric current passes through it?
Why does the bulb glow in the tester when the electric current passes through it?
In a situation where the liquid is conducting but the bulb does not glow, what could be a possible reason?
In a situation where the liquid is conducting but the bulb does not glow, what could be a possible reason?
Why might the current in the circuit be too weak even if the circuit is complete?
Why might the current in the circuit be too weak even if the circuit is complete?
What happens to a compass needle kept nearby when current flows in a wire?
What happens to a compass needle kept nearby when current flows in a wire?
How does the filament of the bulb get heated?
How does the filament of the bulb get heated?
Why might a bulb not glow even if the liquid is conducting?
Why might a bulb not glow even if the liquid is conducting?
Why are people cautioned against touching an electrical appliance with wet hands?
Why are people cautioned against touching an electrical appliance with wet hands?
What type of materials are good conductors of electricity?
What type of materials are good conductors of electricity?
Which of the following materials conduct electricity based on what was learned in Class VI?
Which of the following materials conduct electricity based on what was learned in Class VI?
What type of materials are poor conductors of electricity?
What type of materials are poor conductors of electricity?
In what state were the materials tested for conducting electricity prior to testing liquids?
In what state were the materials tested for conducting electricity prior to testing liquids?
Why is it advised to use only electric cells for activities involving testing conductivity?
Why is it advised to use only electric cells for activities involving testing conductivity?
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Study Notes
Electric Current and Conductivity
- The anode (positive electrode) is connected to the positive terminal of the battery when producing oxygen bubbles in water.
Effects of Electric Current on Conducting Solutions
- When electrodes are immersed in water and a current is passed through, chemical reactions occur, such as the decomposition of water into oxygen and hydrogen.
- The chemical effects of electric current passing through a conducting solution include the formation of bubbles, changes in color, and changes in the state of the substance.
Experiment with Potato and Copper Wires
- When a potato is cut into two halves and copper wires of a tester are inserted into it, the potato acts as a conducting solution, allowing the electric current to pass through.
- The type of reaction that occurs when an electric current passes through a conducting solution is determined by the nature of the solution and the electrodes used.
Electric Current and Bulb
- When an electric current passes through the circuit, the bulb glows due to the filament getting heated.
- If the liquid is conducting but the bulb does not glow, it may be due to a weak current or a faulty bulb.
- A weak current in the circuit can occur even if the circuit is complete, possibly due to high resistance in the wires or a weak battery.
Magnetism and Electric Current
- When current flows in a wire, it creates a magnetic field, causing a compass needle kept nearby to deflect.
Safety Precautions with Electricity
- People are cautioned against touching an electrical appliance with wet hands because water is a good conductor of electricity and can increase the risk of electric shock.
- Good conductors of electricity include metals like copper and iron.
- Poor conductors of electricity include materials like wood, glass, and rubber.
- Materials were tested for conducting electricity in their dry state.
- It is advised to use only electric cells for activities involving testing conductivity to avoid any risks of electric shock.
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