Educational worksheet exploring the uses of common metals in everyday life.

It looks like you've uploaded a worksheet titled "Uses of common metals" that contains a series of questions about the properties and applications of different metals. Since I can't view images directly, I’ll help you solve the problems based on the text you’ve provided. Let me go through each question step by step and explain the answers.

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1. Match the metals to their uses (draw lines):

| Metal | Uses |
|------|------|
| Iron | - Make bridges, cars, ships, and buildings |
| Copper | - Used in electrical wiring and plumbing |
| Aluminium | - Lightweight, used in aircraft, drink cans, and cooking pans |
| Silver | - Used in jewelry, photography, and electronics |
| Gold | - Used in jewelry, electronics, and dental work |

Explanation:
- Iron: Strong and durable; used in construction and vehicles.
- Copper: Good conductor of electricity; widely used in wires and plumbing.
- Aluminium: Lightweight and corrosion-resistant; ideal for aircraft, cans, and cookware.
- Silver: Highly conductive and shiny; used in jewelry and electronics.
- Gold: Rare and resistant to tarnish; used in jewelry and high-end electronics.

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2. Aluminium has these properties:

#### a) Why is aluminium a good metal to use in drinks cans?
> Answer: Because it is lightweight, strong enough to hold contents, and resistant to rusting (corrosion).

#### b) Why is aluminium a good metal to use in airplanes?
> Answer: It is lightweight and strong, which helps reduce fuel consumption and increase efficiency.

#### c) Why is aluminium a good metal to use in the supermarket (e.g., shelves or trolleys)?
> Answer: It is strong, corrosion-resistant, and lightweight—ideal for long-term use in busy environments.

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3. Iron is used in structural construction, e.g., steel beams and rails, and also in cars and tools.

#### a) Why is iron a good metal to use in bridges?
> Answer: Iron is very strong and can support heavy loads over long spans.

#### b) Why is iron a good metal to use in cars?
> Answer: It provides strength and durability, protecting passengers and supporting vehicle structure.

#### c) Why is iron a good metal to use in tools?
> Answer: It is hard and strong, making it suitable for cutting, drilling, and other mechanical tasks.

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4. How do these properties help?

#### a) Hard and strong – What is a useful property of this?
> Answer: It allows materials to withstand pressure and impact without breaking—useful in construction and machinery.

#### b) Why is copper a good metal to use in electrical wiring?
> Answer: Copper is an excellent conductor of electricity and flexible, allowing it to carry current efficiently.

#### c) Why are some things made out of gold or silver (jewelry)?
> Answer: They are shiny, attractive, and resistant to tarnishing—making them ideal for decorative purposes.

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5. Which of these metals would be best to make a saucepan? Why?

- Metals listed: Iron, copper, aluminium, lead, mercury

> Best choice: Aluminium or copper
>
> Why?
> - Aluminium: Lightweight, conducts heat well, and doesn’t react with food.
> - Copper: Excellent heat conduction, but often lined with stainless steel to prevent toxicity.
>
> Lead and mercury are toxic and unsafe for cooking.
> Iron can rust and may affect taste if not coated.

✔ So, aluminium is usually preferred for saucepans due to safety, cost, and performance.

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6. A scientist is designing a new type of bicycle frame. What properties should the metal have?

> Answer: The metal should be:
> - Light (low density)
> - Strong (high tensile strength)
> - Corrosion-resistant
> - Durable and safe under stress
>
> Examples: Aluminium alloys or titanium are commonly used because they meet these criteria.

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7. If a metal was soft, what could it be used for?

> Answer: Soft metals like gold or lead can be used where malleability is important—such as:
> - Gold in electronics (easy to shape into thin wires)
> - Lead in batteries or radiation shielding (though less common now)

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8. Which property should a metal have to be used in a boiler pipe?

> Answer: The metal must be:
> - Resistant to high temperatures
> - Corrosion-resistant (especially to steam and water)
> - Strong under pressure
>
> Example: Stainless steel is often used because it resists rust and withstands heat.

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9. What property should a metal have to be used in a car engine?

> Answer: The metal should:
> - Withstand high temperatures
> - Be strong and durable
> - Resist wear and corrosion
>
> Example: Alloyed metals like cast iron or aluminum alloys are used.

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10. Which property should a metal have to be used in a fuse?

> Answer: The metal should have:
> - A low melting point so it melts quickly when too much current flows
> - High conductivity
>
> Example: Tin or lead alloys are used because they melt at low temperatures.

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11. Which property should a metal have to be used in a saucepan?

> Answer: The metal should:
> - Conduct heat well
> - Be non-toxic
> - Be resistant to corrosion and reacting with food
> - Be easy to clean
>
> Best examples: Stainless steel, aluminium, or copper (with lining).

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Final Summary Table (Optional Review)

| Metal | Key Properties | Common Uses |
|-------|----------------|-------------|
| Iron | Strong, magnetic | Buildings, cars, tools |
| Copper | Good conductor, ductile | Wiring, plumbing |
| Aluminium | Lightweight, corrosion-resistant | Cans, planes, cookware |
| Silver | High conductivity, shiny | Electronics, jewelry |
| Gold | Non-reactive, shiny | Jewelry, electronics |

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