Carbon and its Compound
ICSE · Class 8 · Chemistry
Flashcards for Carbon and its Compound — ICSE Class 8 Chemistry. Quick Q&A cards covering key concepts, definitions, and formulas.
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What is allotropy?
Answer
Allotropy is the phenomenon due to which an element exists in two or more forms in the same physical state with identical chemical properties but different physical properties. Example: carbon exists …
What is the symbol, atomic number, mass number, and valency of carbon?
Answer
Carbon has symbol C, atomic number 6, mass number 12, and valency 4.
Why is carbon called the basis of life?
Answer
Carbon is the very basis of life because all living things contain carbon. It is also the third most important element for life on earth, after oxygen and hydrogen.
What is catenation?
Answer
Catenation is the property of carbon atoms to link with one another and form long chains, branched chains, or ring compounds. This helps carbon form many compounds.
What are the crystalline allotropes of carbon?
Answer
The crystalline allotropes of carbon are graphite, diamond, and fullerene. They have different structures and different physical properties.
Describe the structure and use of graphite.
Answer
Graphite is a natural crystalline form of carbon. Each carbon atom is linked to three neighbours in hexagonal layers. The layers are held by weak forces, so they can slide over one another. Graphite i…
Why is graphite a good conductor of electricity?
Answer
In graphite, one valence electron of each carbon atom remains free. These free electrons help graphite conduct electricity well.
How is the structure of diamond different from graphite?
Answer
Diamond is a giant molecule in which each carbon atom is linked with four neighbouring carbon atoms in a rigid tetrahedral structure. This strong bonding makes diamond very hard. Diamond does not cond…
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