Zinc and Copper Properties in Pennies

The video demonstrates heating a penny to extract molten zinc, leaving a thin copper shell. It highlights the properties of zinc, such as its shiny appearance and malleability, and explains why copper is used on the outside of pennies due to its resistance to tarnishing compared to zinc.

What happens to a penny when it is heated?

• It melts completely.

• It remains unchanged.

• Molten zinc pours out, leaving a copper shell.

• It turns into a gas.

What is the primary metal found inside a penny?

• Copper

• Iron

• Aluminum

• Zinc

How does the zinc appear after being extracted from the penny?

• Dull and rough

• Shiny and smooth

• Rusty and brittle

• Transparent and fragile

What is a notable property of zinc that is mentioned?

• It is highly magnetic.

• It is a good insulator.

• It is malleable and can be bent easily.

• It is very hard.

Why is copper used on the outside of a penny instead of zinc?

• Copper is cheaper than zinc.

• Copper is more resistant to tarnishing.

• Zinc is more expensive.

• Zinc is too heavy.

What would happen to zinc if it were exposed on the outside of a penny?

• It would change color to green.

• It would corrode and tarnish quickly.

• It would become magnetic.

• It would remain shiny indefinitely.