chapter 1 short answer question
chapter 1 short answer question 9th Chemistry New Book
Q1. Why is there a need to divide Chemistry into many branches? Give three reasons.
chemistry is divided into many branches because of practical applications, specialization and scope of study.
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Q2. Reaction may take place due to electrons present outside the nucleus or they may take place inside the nucleus. Which branches of chemistry cover these two types of reaction?
Organic Chemistry, Inorganic Chemistry and Physical Chemistry deal with the electron based reactions but Nuclear chemistry deals with the nuclear based reactions.
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Q3. What types of problems are solved in analytical chemistry?
In Analytical chemistry we solve the problems related to analysis, separation and identification of substances.
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Q4. Both graphite and graphene have hexagonal layered structures. What is the difference?
In Graphene there is only one layer of Carbon atoms but in Graphite there are many Graphene layers. Graphite is soft but Graphene is extremely hard.
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Q5. Why are supercritical fluids important?
Supercritical fluids are important because they are mostly used in industry and they can dissolve the substances easily.
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Q6. In which state does matter exist in the Sun?
In Sun matter is present in ions and electrons. That state is called Plasma.
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Q7. What is the importance of graphene?
Graphene is important because it is very strong and a good conductor. Graphene is also flexible and thin. In industry, we frequently use graphene.
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Q8. Which form of matter do most of the material things in this world belong to?
Most of the materials in the world belong to solid state of matter.
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