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Class 7 Science Chapter 4 NCERT Book - The World of Metals and Non-metals

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FAQs on Class 7 Science Chapter 4 NCERT Book - The World of Metals and Non-metals

1. What are the main differences between metals and non-metals?
Ans. Metals are typically shiny, good conductors of heat and electricity, and are malleable and ductile. They tend to lose electrons during chemical reactions. Non-metals, on the other hand, are usually dull, poor conductors, and are brittle in solid form. They tend to gain or share electrons during chemical reactions.
2. How do metals react with oxygen?
Ans. Metals generally react with oxygen to form metal oxides. This reaction is often exothermic, meaning it releases heat. For example, when iron reacts with oxygen, it forms iron oxide, commonly known as rust.
3. Can non-metals conduct electricity?
Ans. Non-metals are generally poor conductors of electricity. However, there are exceptions such as graphite, a form of carbon, which can conduct electricity due to the mobility of its electrons.
4. What are some common uses of metals in everyday life?
Ans. Metals have a wide range of uses in daily life. For example, aluminum is used in packaging and construction, copper is used in electrical wiring, and iron is used in building structures and machinery.
5. Why are alloys important and how are they different from pure metals?
Ans. Alloys are mixtures of two or more metals or a metal and a non-metal, which enhance certain properties such as strength, corrosion resistance, and ductility. For example, steel is an alloy of iron and carbon, which is stronger than pure iron alone.
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