NCERT Science 2nd Chapter (IS MATTER AROUND US PURE?)

NCERT Science 2nd Chapter

(IS MATTER AROUND US PURE?)

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2.1 What is a Mixture?

Mixtures are constituted by more than one

kind of pure form of matter. We know that

dissolved sodium chloride can be separated

from water by the physical process ofevaporation. However, sodium chloride is itself

a pure substance and cannot be separated by

physical process into its chemical constituents.

Similarly, sugar is a substance which contains

only one kind of pure matter and its

composition is the same throughout.

Soft drink and soil are not single pure

substances. Whatever the source of a

pure substance may be, it will always have

the same characteristic properties.

Therefore, we can say that a mixture

contains more than one pure substance.

2.2 What is a Solution?

A solution is a homogeneous mixture of two

or more substances. You come across various

types of solutions in your daily life. Lemonade,

soda water etc. are all examples of solutions.

Usually we think of a solution as a liquid that

contains either a solid, liquid or a gas

dissolved in it. But, we can also have solid

solutions (alloys) and gaseous solutions (air).

In a solution there is homogeneity at the

particle level. For example, lemonade tastes the

same throughout. This shows that particles of

sugar or salt are evenly distributed in the

solution.

Sl. no.	Dispersed phase	DispersingMedium	Type	Example
1	Liquid	Gas	Aerosol	Fof, Cloud, Mist
2	Solid	Gas	Aerosol	Smoke, automobile exhaust
3	Gas	Liquid	Foam	Shaving cream

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Benefits of NCERT books

Some key benefits of studying NCERT books and NCERT Exemplar Problems, for CBSE Students are stated below:

1. Offers in-depth knowledge in easy language

All NCERT books are written by experts after an extensive research on each and every topic to provide apt and authentic information to the students. These books are designed to serve each student, irrespective of their intelligence quotient, with apt information and knowledge in simple and easy language. Each topic in these books is provided with every minute detail. Thus the NCERT books if studied meticulously can clear all the doubts giving you a thorough understanding about complex topics and subjects even.

2. Strictly follows the CBSE curriculum

This is another most prominent reason that why NCERT books prove to be of a great use to students. These books strictly adhere to the CBSE curriculum due to which NCERT books are sufficient enough as the material they contain forms the base for not only board exams but for competitive exams like JEE as well. NCERT textual materials help to form the base for preparing for the board examinations as the question papers in CBSE board are set according to the prescribed syllabus of the subject.

3. Clears all fundamental concepts

NCERT books are not only sufficient to cover the entire CBSE syllabus but are also enough to cover all the basics and fundamentals on all topics in simple and easy language. This helps the students to make their concepts crystal clear. Once the concepts are clear, you don’t need to mug up the whole stuff again and again. All you need to do during the exams is just to revise the formulas, the terms and their execution. That’s why NCERT books are considered ideal for thorough and comprehensive studying to develop a clear concept.

4. Best for the CBSE board exams

If you go through the past years’ exam papers, you will find that most of the questions asked in the papers are taken directly or indirectly from NCERT books. In fact, for last two years the CBSE Class 12 Mathematics exam, that was claimed to be the toughest each year, contained most of the questions from NCERT Exemplar Problems.  Many times CBSE asks twisted questions in the board papers. Then the students who simply mug up the NCERT books, claim that the paper is out of syllabus. However, one needs to understand that by studying NCERT books means that you should clarify your concepts and learn to apply them. It is important to read and study these books carefully because usually, nothing beyond these books is asked.

5. Offers a number of problems to practice

However hard you work on a topic, you can’t succeed until you practice the same. In NCERT books, you will find questions at the end of chapters. These can be short or long answer type quizzes, match-the-following or fill-in-the-blanks questions. Thus, in order to score optimum marks in the board papers, it is very important for the students to practice a variety of questions. In addition to these exercise questions, it’s also important to practice the NCERT Exemplar problems. This will help you have an easy hand at the twisted questions as well.

Conclusion

There is absolutely no harm in using additional books or reference books. But most of the times, it is seen that these reference books are actually full of concise notes, without providing any basic knowledge which can deviate the students from their target and confuse them. That is why, it is better to stick to NCERT books and practice NCERT Exemplar problems to perform outstanding in the board exams.

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NCERT Science 1st Chapter (MATTER IN OUR SURROUNDINGS)

NCERT Science 1st Chapter

(MATTER IN OUR SURROUNDINGS)

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Here we mention what the chapter contains:

1.1.1 MATTER IS MADE UP OF PARTICLES

For a long time, two schools of thought prevailed

regarding the nature of matter. One school

believed matter to be continuous like a block

of wood, whereas, the other thought that matter

was made up of particles like sand. Let us

perform an activity to decide about the nature

of matter – is it continuous or particulate?................. continue....

1.2.1 PARTICLES OF MATTER HAVE SPACE

BETWEEN THEM

In activities 1.1 and 1.2 we saw that particles

of sugar, salt, Dettol, or potassium

permanganate got evenly distributed in water.

Similarly, when we make tea, coffee or

lemonade (nimbu paani ), particles of one type

of matter get into the spaces between particles

of the other. This shows that there is enough

space between particles of matter...............continues

1.5.2 HOW DOES EVAPORATION CAUSE

COOLING?

In an open vessel, the liquid keeps on

evaporating. The particles of liquid absorb

energy from the surrounding to regain the

energy lost during evaporation. This

absorption of energy from the surroundings

make the surroundings cold.........continue............

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