While mixing sugar with water, the level of water does not increase because
What is the effect on water's chemical and physical properties when the temperature is changed?
During summer, water kept in an earthen pot becomes cool because of the phenomenon of
Evaporation of water through pores of earthen pot reduces temperature of immediate surroundings. This makes the water cool after some time.
Movement of water through plants and evaporation through its aerial parts is called transpiration.
Diffusion is the movement of a substance from an area of higher concentration to area of lower concentration If molecules of a solvent tend to pass through a semipermeable membrane from a less concentrated solution into a more concentrated one it is called osmosis.
Meena experimented, as shown above. When she pushed the bottle into the basin of water, she could see bubbles escaping from the rubber tube into the beaker of water. What Can We infer from her experiment?
As Meena pushes the bottle, the water level in the bottle increases and air present in the bottle gets pushed into the tube, which is bubbled out from the beaker. This experiment proves that air and water occupy some space, and only one matter can occupy space at any one time.
Which of the following is a surface phenomenon?
During change of state in a matter, the temperature remains the same due to:
The rate of evaporation does not depend on:
Bose-Einstein Condensate have
Bose-Einstein condensate (BEC), a state of matter in which separate atoms or subatomic particles, cooled to near absolute zero (0 K, − 273.15 °C, or − 459.67 °F; K = kelvin), coalesce into a single quantum mechanical entity—that is, one that can be described by a wave function—on a near-macroscopic scale.
With the increase of temperature, which of these changes
Water Vapour At 373 K(100°C) have__________________________ energy than water at the same temperature.
The best evidence for the existence and movement of particles in liquids was provided by:
On placing an iron nail in a copper sulphate solution, it is observed that :
Rahul added 2 mL of barium chloride solution to 2 mL sodium sulphate solution in a test tube and observed that :
BaCl2 + Na2SO4 → 2NaCl + BaSO4 ↓
This is a double displacement reaction as the two compounds exchange their ions to form two different compounds.
While determining the boiling point of water, the teacher suggested adding some pumice stone pieces to the hard glass test tube containing water. This was done to :
To determine the melting point of ice, a student immersed the thermometer bulb in crushed ice in a beaker and heated the beaker on a low flame. He would observe :