• Drop a crystal of copper sulphate or potassium permanganate into a glass of hot water and another containing cold water. Do not stir the solution. Allow the crystals to settle at the bottom.
• What do you observe just above the solid crystal in the glass?
• What happens as time passes?
• What does this suggest about the particles of solid and liquid?
• Does the rate of mixing change with temperature? Why and how?
NCERT Class 9th Science Ch 1 Matter in Our Surroundings
Answers
Answered by
277
When a Drop of Copper Sulphate or Potassium Permanganate are added to a glass of hot water and cold water respectively, we observe that :
---> In the glass of cold water, Copper sulphate /KMnO4 crystals settles down at the bottom and whereas in Hot water , CuSO4/KMnO4 crystals spreads slowly and we can see the colour of water changing to blue/pink.
---> After some period of time, we an observe that even in cold water CuSO4 /KMnO4 crystals will dissolve in cold water at slow rate whereas in Hot water it dissolves faster and colour of water Changes to blue/Pink .
---->This activity suggests that , The particles of matter move continuously . As they move they posses Kinetic energy. As temperature increases, the kinetic energy of particles increases and thus particles get diffused at faster rate.
We can conclude from this activity that :
1. Diffusion is the property of particles of matter which increases with increase of temperature.
2. Temperature is a measure of Average kinetic energy of molecules
---> In the glass of cold water, Copper sulphate /KMnO4 crystals settles down at the bottom and whereas in Hot water , CuSO4/KMnO4 crystals spreads slowly and we can see the colour of water changing to blue/pink.
---> After some period of time, we an observe that even in cold water CuSO4 /KMnO4 crystals will dissolve in cold water at slow rate whereas in Hot water it dissolves faster and colour of water Changes to blue/Pink .
---->This activity suggests that , The particles of matter move continuously . As they move they posses Kinetic energy. As temperature increases, the kinetic energy of particles increases and thus particles get diffused at faster rate.
We can conclude from this activity that :
1. Diffusion is the property of particles of matter which increases with increase of temperature.
2. Temperature is a measure of Average kinetic energy of molecules
Answered by
73
Answe: -> Crystals of copper sulphate will start dissolving faster in the glass containing hot water because the temperature increases the kinetic energy of particles and it therefore diffuses faster than in cold watered glass.
-> The color of the solution changes.
-> This suggests that matter have space between them .
-> Yes, rate of mixing changes due to temperature differences(first para)
Explanation:
Similar questions