Задача Задача №3766553
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Реши задание на изображении
Quick answers
Task 1 — Match the Physical Property
- Malleable → D — can be hammered or rolled into flat sheets
- Brittle → A — breaks or shatters easily
- Ductile → B — can be drawn into a thin wire
- Lustrous → C — shiny and reflects light
Answers: 1 → D, 2 → A, 3 → B, 4 → C
Task 2 — Element Classification
| Element | Classification |
|---|---|
| Iron (Fe) | Metal |
| Sulfur (S) | Non-metal |
| Silicon (Si) | Metalloid |
| Copper (Cu) | Metal |
| Oxygen (O) | Non-metal |
| Boron (B) | Metalloid |
Task 3 — Laboratory Data Interpretation
| Sample | Classification | Reason |
|---|---|---|
| A | Metal | Shiny, malleable, good conductor, high melting point |
| B | Non-metal | Dull powder, brittle, poor conductor, low melting point |
| C | Metalloid | Semiconductor, brittle, very high melting point |
| D | Non-metal | Dull, brittle, poor conductor |
Key principle
- Metals: usually shiny, malleable and ductile, good conductors of electricity and heat.
- Non-metals: often dull and brittle, usually poor conductors; melting points vary.
- Metalloids: have properties between metals and non-metals; many are semiconductors.
Task 4 — Material Choice
The visible sheet does not list specific materials for Task 4, so there is no single exact answer. The general rule is:
Choose a material because its physical properties match the job it must do.
Examples:
- Copper for wires — good electrical conductor and ductile.
- Aluminium for foil — malleable and light.
- Steel for structures — strong and hard.
- Rubber/plastic for handles — poor conductors, so they insulate.
- Silicon for computer chips — a metalloid with semiconductor properties.
Check: each definition in Task 1 is used once, and each classification in Tasks 2–3 matches the evidence given.
