Class 8 Exam > Class 8 Videos > Chapter 4 - Metals and Non-Metals : Brief of Complete Chapter, Class 8 Science
Chapter 4 - Metals and Non-Metals : Brief of Complete Chapter, Class 8 Science Video Lecture
FAQs on Chapter 4 - Metals and Non-Metals : Brief of Complete Chapter, Class 8 Science Video Lecture
| 1. What is the difference between metals and non-metals? |  |
Ans. Metals are elements that are generally solid at room temperature, have a shiny appearance, are good conductors of heat and electricity, and have high melting and boiling points. Non-metals, on the other hand, can exist in various states (solid, liquid, or gas) at room temperature, have a dull appearance, are poor conductors of heat and electricity, and have low melting and boiling points.
| 2. Give examples of metals and non-metals. | |
Ans. Examples of metals include iron, copper, gold, silver, and aluminum. Examples of non-metals include carbon, oxygen, nitrogen, sulfur, and chlorine.
| 3. What are the physical properties of metals? | |
Ans. Metals have several physical properties, including high density, malleability (ability to be hammered into thin sheets), ductility (ability to be drawn into wires), high thermal and electrical conductivity, and a metallic luster.
| 4. What are the physical properties of non-metals? | |
Ans. Non-metals have several physical properties, including low density, brittleness (tendency to break or shatter when subjected to stress), low thermal and electrical conductivity, and a non-metallic luster (dull appearance).
| 5. What are the uses of metals and non-metals? | |
Ans. Metals have various uses, such as in construction (e.g., steel beams), electrical wiring (copper wires), and jewelry (gold and silver). Non-metals have uses in various industries, such as carbon in the form of graphite for making electrodes, oxygen for supporting combustion, and nitrogen for manufacturing fertilizers.
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