Chemistry and Matter

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Co2 is generally havier then oxygen and nitrogen . Why does it not form lower layer in the atmosphere?
Subject
Topic
Level
Junior High
Grade
9
What is matter
Subject
Topic
Level
Highschool
Grade
7

Explain about diffusion of gases with example


 

Subject
Topic
Level
Highschool
Grade
9

viscosity of water is decreased due to temperature when it.is heated about 90°,the value.Will.be


 

Subject
Topic
Level
Highschool
Grade
11
Why is this principle about the relationship between mass and volume always true of substances but not always true of mixtures
Subject
Topic
Level
Highschool
Grade
11
Is evaporation is bulk phenomenon
Subject
Topic
Level
Highschool
Grade
9

Principles and applications of dye from ink

Subject
Level
Highschool
Grade
9

Milk is a pure substance, this statement is true or false 


 

Subject
Level
Highschool
Grade
7

 2020.04.02 20:32 Water, Milk, Kerosene. Mercury are the examples 01 2) Liquids VI CHEMISTRII 4) All the above 3) Gases 1) Solids In solids, cooling reduces molecular energy, causing lowering of vibration leadingt 4) None 3) No change 1) Expansion 2) Contraction Due to the continuous motion of particles of matter it possess 2) Kinetic energy 4) None 3) Both 1 & 2 1) Potential energy Force between the same kind of particles is called 1) Cohesive force 4) None 3) Nuclear force 2) Adhesive force . The particles of matter which possess kinetic energy are in the state of 1) Continuous motion 2) Discontinuous motion 3) Static 4) All the above B. Which of the following conditions should be altered to change the state of matter from state to another ? 1) Pressure 2) Volume 3) Temperature 4) All the above 9. What happens to melting point of solid when impurities are added to the pure solid ? 1) Melting point increases 2) Melting point decreases 3) Remains the same 4) None D. What will happen if molecules become free to slip over one another and flow ? I) Liquid turns into solid 2) Solid turns into liquid 3) Solid turns into gas 4) All the above 1. Absorption of heat energy during melting will increase the vibrations of molecules & t intermolecular forces will 1) Decrease 2) Increase 3) Remain the same Due to weakening of intermolecular forces in the process of melting point, the mo 4) None 2. start vibrating 1) Less vigorously 2) More vigorously 3) Remains the same 3. Boiling will take place by 4) None 1)Absorbing heat energy 3) Either 1 or 2 2) Removing heat energy 24. Presence of impurities will 4) All the above 1) Decrease the boiling point 3) No change 2) Increase the boiling poir 

Subject
Level
Highschool
Grade
8

Which method is used to quickly seperation of the precipitate obtained during chemical experiments

Subject
Level
Highschool
Grade
8

Spirit kept open in a watch glass disappears after some time.which among the following phenomena are responsible for this?

Subject
Level
Highschool
Grade
8

How is dog different from smoke ?

Subject
Level
Highschool
Grade
9
Sodium metal is a pure substances and so is sodium chlpride,inspite of the fact that sodium chloride contains two different element.explain.
Subject
Level
Highschool
Grade
9
Subject
Level
Junior High
Grade
9
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