1. Common non-metals in daily life: Oxygen, Nitrogen, Carbon, Sulfur, Phosphorus.
2. Hardest naturally occurring substance: Diamond (form of carbon).
3. Property of metals enabling electric wires: High electrical conductivity.
4. Non-metal that is metallic luster: Iodine.
5. Two non-metals that are soft solids: Sulfur, Phosphorus.
6. Non-metal that does not conduct electricity or heat except one: Graphite (a form of carbon) conducts electricity.
7. An allotrope of carbon which is as tensile as steel: Graphene.
8. Metals that are not attacked by cold water, boiling water, or steam: Gold, Platinum.
9. The property of metals by virtue of which they can be beaten into sheets: Malleability.
10. Non-metals used in disinfection of drinking water: Chlorine, Ozone.
II. Answer the following:
1. Elements that could be either metals or non-metals: Hydrogen, Boron, Silicon, Germanium, Arsenic, Antimony, Tellurium.
2. Best conductor of heat and electricity: Silver.
3. Property making metals good for cooking vessels: Thermal conductivity.
4. Arrange in order of increasing reactivity: Sodium > Magnesium > Copper > Zinc > Aluminum.
5. Metal turning blue litmus red: Aluminum (when reacting with acid, but note: aluminum itself doesn’t turn litmus red; its ions in acidic solution may affect pH).
6. Non-metal used in matchstick production: Phosphorus (red phosphorus on matchbox striking surface).
7. Most reactive non-metal among given: Fluorine (not listed, but if limited to list: Oxygen is more reactive than others listed like copper, zinc, gold).
8. Identify: Potassium (metal), Phosphorus (non-metal), Copper (metal), Zinc (metal), Gold (metal).
9. Nature of oxides of non-metals: Acidic or neutral.
10. Example of metal that sinks in water and why: Iron — because its density is greater than that of water.
Parent Tip: Review the logic above to help your child master the concept of properties of metals and nonmetals worksheet answers.
