can anyone give me the notes of cbse science ch 2 topic 2.2 -sepreting the components of a mixture
who will give first I will mark as brainlist
Answers
Answer:
u download the Ncert app in that every class's notes solution everything is coming
Answer:
Solution 1
A substance is a pure single form of matter. It cannot be separated into other kinds of matter by any physical process. For example: sugar, sodium chloride.
Concept insight: In this answer, you should write the definition of substance and give at least two examples.
Solution 2
Homogeneous mixtures Heterogeneous mixtures
1. They have uniform compositions.
2. The components of homogeneous mixtures are not physically distinct.
3. They have no visible boundaries of separation between the constituents.
1. They have non-uniform compositions.
2. They contain physically distinct parts.
3. They have visible boundaries of separation between the constituents.
Concept insight: This is an important question from exam point of view.
Chapter 2 - Is Matter Around Us Pure ? Exercise 18
Solution 1
Homogeneous mixtures
Heterogeneous mixtures
The substances are completely mixed together in these mixtures.
The substances remain separate in these mixtures.
They have uniform compositions throughout their mass.
They have non-uniform compositions throughout their mass.
They have no visible boundaries of separation between the constituents.
They have visible boundaries of separation between the constituents.
Salt in water, sugar in water are examples of homogeneous mixtures.
Mixtures of sodium chloride and iron filings and oil and water are examples of heterogeneous mixtures.
Concept insight: This is an important question from exam point of view. It can come for 2 or 3 marks.
Solution 2
Solution
Sol
Suspension
A solution is a homogeneous mixture of two or more substances.
A sol is a heterogeneous mixture.
Suspension is a heterogeneous mixture.
The particles of a solution are smaller than 1 nm (10-9 metre) in diameter. So, they cannot be seen by naked eyes.
The size of particles of a sol is too small to be individually seen by naked eyes. It is between 1 nm and 100 nm in diameter.
The particles of a suspension can be seen by the naked eye. Their size is larger than 100 nm in diameter.
Due to small particle size, they do not scatter a beam of light passing through them. Thus, the path of light is not visible in a solution.
Sols are big enough to scatter a beam of light passing through them and make its path visible.
The particles of a suspension scatter a beam of light passing through it and make its path visible.
The solute particles do not settle down when left undisturbed, i.e., a solution is stable.
They do not settle down when left undisturbed, i.e., a sol is quite stable.
The solute particles settle down when a suspension is left undisturbed, i.e., a suspension is unstable.
The solute particles cannot be separated from the mixture by the process of filtration.
The solute particles cannot be separated from the mixture by the process of filtration.
They can be separated from the mixture by the process of filtration.
Explanation: