Metals and Non Metals
ICSE · Class 7 · Chemistry
Flashcards for Metals and Non Metals — ICSE Class 7 Chemistry. Quick Q&A cards covering key concepts, definitions, and formulas.
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What is the most abundant metal in the earth's crust?
Answer
The most abundant metal in the earth's crust is aluminium. It is silvery white, malleable, ductile, and a good conductor of heat and electricity.
What is the most abundant non-metal in the earth's crust?
Answer
The most abundant non-metal in the earth's crust is oxygen.
Which non-metals are present in free state in air?
Answer
Nitrogen and oxygen are present in free state in air. Nitrogen forms 78% of air in free state and is the most abundant element of air.
Why is gold found in free state in nature?
Answer
Gold is found in free state because it is not reactive. Gold and platinum are exclusively found in free state.
Why is silver not used for making electric wires?
Answer
Silver is not used for making electric wires because it is a costly metal, even though it is the best conductor of heat and electricity.
What are the general properties of metals?
Answer
Metals are usually lustrous, hard, dense, sonorous, malleable, ductile, and good conductors of heat and electricity. They generally have high melting and boiling points and high tensile strength.
What are the general properties of non-metals?
Answer
Non-metals are usually dull, brittle, low in density, poor conductors of heat and electricity, and not malleable or ductile. They generally have low melting and boiling points.
What is ductility? Give one example.
Answer
Ductility is the property of a material that allows it to be drawn into thin wires. Gold is the most ductile metal.
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