3.
magnitude of force exerted by the bullet on the wooden
(Section- B Chemistry)
A. Answer the following Questions.
Classify each of the following as a homogeneous or heterogeneous mixture
Soda water, wood, air, soil, vinegar, filtered tea.
2. How would you confirm that a colorless liquid given to you is pure water?
Which one of the following
will form a translucent solution in water?
a) Soil
b) Sand.
c) Starch,
d) Sugar
* Which of the following are chemical changes?
a) Melting of ice
b) Cooking of vegetables.
c) Freezing of water.
d) Drying of wet clothes in sunlight.
What type of mixtures are separated by the technique of crystallisation?
Can a solution be heterogeneous? Explain.
7. Mention two advantages of crystallisation method over evaporation method.
8.Given Reson
a) A gas exerts pressure on the walls of the container.
b) A wooden table should be called a solid.
c) We can easily move our hand in air but to do the same through a solid block of wood we need a karate
expert.
ponie
Answers
Answer:
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1.
Homogeneous mixtures: Soda water, air, vinegar and filtered tea. Heterogeneous mixtures: wood and soil.
2.
The boiling point and freezing point of the given liquid comes out to be 100°C or 373 K and 0°C or 273 K respectively under one atmospheric pressure, it confirms that the given liquid is pure water.
3.
Starch
4.
cooking of vegetables.
5.
Therefore, crystallization is used to separate a solid-liquid mixture.
6.
No, a solution cannot be heterogeneous. A solution is a homogeneous mixture composed of only one phase. In such a mixture, a solute is a substance dissolved in another substance known as solvent.
7.
Crystallization is the better method of separating the mixture than evaporation. This is because, on evaporation, some of the solid particles in mixture get decomposed leaving behind impurities whereas, in crystallization, pure crystals of solids are obtained
8.
a.
A gas exerts pressure on the walls of the container. Reason: They have high kinetic energy and negligible force of attraction so it can move constantly moving with high speed in all directions. ... These collisions of the gas particles with the walls of the container exert pressure on the walls of the container.
b.
A wooden table should be called a solid because it has a definite shape and volume, is rigid, does not flow, the particles are tightly bound with very less kinetic energy and, not diffuse and has negligible intermolecular spaces between its particles.
c.
We can easily move our hand in air but to do the same through a solid block of wood we need a karate expert.
i). The particles of a gas are constantly moving in all the directions with different speeds. Therefore they do not have a fixed volume and hence completely fill the vessel in which they are kept.
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