Physical properties of metals and non metals worksheet | Live ... - Free Printable
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Step-by-step solution for: Physical properties of metals and non metals worksheet | Live ...
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Show Answer Key & Explanations
Step-by-step solution for: Physical properties of metals and non metals worksheet | Live ...
Here is the solution to the “Materials – Metals and Non-Metals Worksheet -1” with clear explanations for each answer:
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1. The most ductile metal.
✔ Answer: Gold (Au)
*Explanation:* Ductility is the ability of a material to be drawn into thin wires. Gold is the most ductile metal — one gram of gold can be stretched into a wire over 2 kilometers long!
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2. The most malleable metal.
✔ Answer: Gold (Au)
*Explanation:* Malleability is the ability to be hammered or rolled into thin sheets. Gold is also the most malleable metal — it can be beaten into sheets as thin as 0.0001 mm.
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3. The metal which is best conductor of electricity.
✔ Answer: Silver (Ag)
*Explanation:* Among all metals, silver has the highest electrical conductivity at room temperature due to its free-moving electrons. Copper is a close second and more commonly used because it’s cheaper.
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4. The non-metal which is good conductor of electricity.
✔ Answer: Graphite (a form of Carbon)
*Explanation:* Most non-metals are insulators, but graphite (an allotrope of carbon) conducts electricity because of its layered structure with delocalized electrons between layers.
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5. The hardest known substance.
✔ Answer: Diamond (a form of Carbon)
*Explanation:* Diamond is the hardest naturally occurring substance on Earth due to its rigid tetrahedral crystal lattice structure, where each carbon atom is bonded strongly to four others.
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6. Name three non-metal which have lustre.
✔ Answer: Iodine, Graphite, Selenium
*Explanation:* While most non-metals are dull, some like iodine (shiny purple-black crystals), graphite (metallic sheen), and selenium (metallic grey form) show metallic luster.
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7. The metal which exists in liquid state at room temperature.
✔ Answer: Mercury (Hg)
*Explanation:* Mercury is the only metal that is liquid at standard room temperature (around 20–25°C). It’s used in thermometers and barometers.
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8. The non-metal which exists in liquid state at room temperature.
✔ Answer: Bromine (Br)
*Explanation:* Bromine is the only non-metal that is liquid at room temperature. It’s a reddish-brown volatile liquid with a strong odor.
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9. The metal which is poor conductor of heat.
✔ Answer: Lead (Pb)
*Explanation:* While most metals conduct heat well, lead is relatively poor at conducting heat compared to others like copper or aluminum. It’s often used for radiation shielding partly because of this property.
*(Note: Some sources may say Bismuth or Titanium, but Lead is the most commonly accepted answer at school level.)*
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10. The metal which is best conductor of heat.
✔ Answer: Silver (Ag)
*Explanation:* Just like electricity, silver is also the best conductor of heat among all metals due to its high thermal conductivity, thanks to its free electron mobility.
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11. Name two non-metal which exist in gaseous state.
✔ Answer: Oxygen (O₂), Nitrogen (N₂)
*Explanation:* At room temperature, many non-metals are gases. Oxygen and nitrogen make up most of Earth’s atmosphere. Others include Hydrogen (H₂), Chlorine (Cl₂ — gas but toxic), and Helium (He).
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12. Name two non-metal which exist in solid state.
✔ Answer: Sulfur (S), Phosphorus (P)
*Explanation:* Many non-metals are solids at room temperature. Sulfur is yellow and brittle; phosphorus comes in white/red forms. Other examples: Carbon (graphite/diamond), Iodine, Selenium.
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✔ Final Summary Table:
| Question | Answer |
|----------|--------|
| 1. Most ductile metal | Gold |
| 2. Most malleable metal | Gold |
| 3. Best electrical conductor (metal) | Silver |
| 4. Good electrical conductor (non-metal) | Graphite |
| 5. Hardest known substance | Diamond |
| 6. Three lustrous non-metals | Iodine, Graphite, Selenium |
| 7. Liquid metal at room temp | Mercury |
| 8. Liquid non-metal at room temp | Bromine |
| 9. Poor heat conductor (metal) | Lead |
| 10. Best heat conductor (metal) | Silver |
| 11. Gaseous non-metals | Oxygen, Nitrogen |
| 12. Solid non-metals | Sulfur, Phosphorus |
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📌 *Note: These answers are based on general science curriculum standards (typically Class 8-10 level). Some properties (like “poorest conductor”) may vary slightly depending on context, but the above are widely accepted.*
Let me know if you’d like a printable version or flashcards for revision!
---
1. The most ductile metal.
✔ Answer: Gold (Au)
*Explanation:* Ductility is the ability of a material to be drawn into thin wires. Gold is the most ductile metal — one gram of gold can be stretched into a wire over 2 kilometers long!
---
2. The most malleable metal.
✔ Answer: Gold (Au)
*Explanation:* Malleability is the ability to be hammered or rolled into thin sheets. Gold is also the most malleable metal — it can be beaten into sheets as thin as 0.0001 mm.
---
3. The metal which is best conductor of electricity.
✔ Answer: Silver (Ag)
*Explanation:* Among all metals, silver has the highest electrical conductivity at room temperature due to its free-moving electrons. Copper is a close second and more commonly used because it’s cheaper.
---
4. The non-metal which is good conductor of electricity.
✔ Answer: Graphite (a form of Carbon)
*Explanation:* Most non-metals are insulators, but graphite (an allotrope of carbon) conducts electricity because of its layered structure with delocalized electrons between layers.
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5. The hardest known substance.
✔ Answer: Diamond (a form of Carbon)
*Explanation:* Diamond is the hardest naturally occurring substance on Earth due to its rigid tetrahedral crystal lattice structure, where each carbon atom is bonded strongly to four others.
---
6. Name three non-metal which have lustre.
✔ Answer: Iodine, Graphite, Selenium
*Explanation:* While most non-metals are dull, some like iodine (shiny purple-black crystals), graphite (metallic sheen), and selenium (metallic grey form) show metallic luster.
---
7. The metal which exists in liquid state at room temperature.
✔ Answer: Mercury (Hg)
*Explanation:* Mercury is the only metal that is liquid at standard room temperature (around 20–25°C). It’s used in thermometers and barometers.
---
8. The non-metal which exists in liquid state at room temperature.
✔ Answer: Bromine (Br)
*Explanation:* Bromine is the only non-metal that is liquid at room temperature. It’s a reddish-brown volatile liquid with a strong odor.
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9. The metal which is poor conductor of heat.
✔ Answer: Lead (Pb)
*Explanation:* While most metals conduct heat well, lead is relatively poor at conducting heat compared to others like copper or aluminum. It’s often used for radiation shielding partly because of this property.
*(Note: Some sources may say Bismuth or Titanium, but Lead is the most commonly accepted answer at school level.)*
---
10. The metal which is best conductor of heat.
✔ Answer: Silver (Ag)
*Explanation:* Just like electricity, silver is also the best conductor of heat among all metals due to its high thermal conductivity, thanks to its free electron mobility.
---
11. Name two non-metal which exist in gaseous state.
✔ Answer: Oxygen (O₂), Nitrogen (N₂)
*Explanation:* At room temperature, many non-metals are gases. Oxygen and nitrogen make up most of Earth’s atmosphere. Others include Hydrogen (H₂), Chlorine (Cl₂ — gas but toxic), and Helium (He).
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12. Name two non-metal which exist in solid state.
✔ Answer: Sulfur (S), Phosphorus (P)
*Explanation:* Many non-metals are solids at room temperature. Sulfur is yellow and brittle; phosphorus comes in white/red forms. Other examples: Carbon (graphite/diamond), Iodine, Selenium.
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✔ Final Summary Table:
| Question | Answer |
|----------|--------|
| 1. Most ductile metal | Gold |
| 2. Most malleable metal | Gold |
| 3. Best electrical conductor (metal) | Silver |
| 4. Good electrical conductor (non-metal) | Graphite |
| 5. Hardest known substance | Diamond |
| 6. Three lustrous non-metals | Iodine, Graphite, Selenium |
| 7. Liquid metal at room temp | Mercury |
| 8. Liquid non-metal at room temp | Bromine |
| 9. Poor heat conductor (metal) | Lead |
| 10. Best heat conductor (metal) | Silver |
| 11. Gaseous non-metals | Oxygen, Nitrogen |
| 12. Solid non-metals | Sulfur, Phosphorus |
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📌 *Note: These answers are based on general science curriculum standards (typically Class 8-10 level). Some properties (like “poorest conductor”) may vary slightly depending on context, but the above are widely accepted.*
Let me know if you’d like a printable version or flashcards for revision!
Parent Tip: Review the logic above to help your child master the concept of properties of metals and nonmetals worksheet.
