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Is Matter Around Us Pure?

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Is Matter Around Us Pure?

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Chapter 1 CBSE Papers, Questions, Answers, MCQ ...
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Chapter 2 MONDAY, JULY 16, 2012
Chapter 3 CBSE - Class 9 - CH2 - Is Matter Around Us Pure

Q1: On the basis of composition, how matter is classified?

Answer:
* Pure Subtance
* Mixture

Q2(NCERT): What is meant by a pure substance?

Answer: A sample of matter containing only one substance is called a pure substance. In other words all constituents of the substance are same in their chemical nature.

Q3: What are the characteristics exhibited by a pure substance?

Answer: 
1. A pure substance contains only one kind of atoms or molecules. 2. It is perfectly homogenous
3. It has definite composition which does not vary with time. 4. It has definite melting point, boiling point, density etc. Q4: What are different categories of pure substance?
Answer:
* Elements
* Compounds
Q5: Name two properties of a substance to check its purity?

Answer: A pure substance has a fixed melting point or boiling point at constant pressure. The purity of a substance can be tested by checking its melting point or boiling point. If a substance is impure i.e. it...