Matter: Pure and impure substances. Science CBSE, Class 9: lessons, tests, tasks.

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1.	Introduction to pure substance and mixture
2.	Pure substances
3.	Mixtures
4.	Mixture and compound
5.	Solution and its types
6.	Solution: Properties and concentration
7.	Calculation: Concentration of the solution
8.	Suspension
9.	Colloidal Solutions and its Properties

1.	Mixture and compound Difficulty: easy	2
2.	Classification pure substances Difficulty: easy	2
3.	Example of classification of matters Difficulty: easy	2
4.	Pure and impure substances Difficulty: easy	2
5.	Solutions Difficulty: easy	2
6.	Colloidal solutions Difficulty: easy	2
7.	Mass percentage Difficulty: medium	4
8.	Colloidal solutions and its properties Difficulty: medium	4
9.	Mixture and solutions Difficulty: medium	3
10.	Calculation for the mass percentage Difficulty: medium	4
11.	Element, mixture and compound Difficulty: medium	3
12.	Classification of matter based on its types Difficulty: medium	5
13.	Purity of the matter Difficulty: medium	4
14.	Crystalline forms of carbon and compounds Difficulty: medium	4
15.	Solution, colloidal and suspension Difficulty: hard	5
16.	Solutions Difficulty: hard	4
17.	Mass of the solution Difficulty: hard	5
18.	Distillation, physical and chemical change Difficulty: hard	4
19.	Colloidal solutions and its properties Difficulty: hard	4
20.	Types of Colloidal Solutions Difficulty: hard	4

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Matter: Pure and impure substances