Question

2. Write the definition of following in your own words. a. Crystallization. b. Rusting. c. Convection. d. Acid and base. class 7 science.​

Answer 1

Answer:

crystallization is defined as a Process by which chemical is converted from a liquid solution into a solid crystalline state

the formation of reddish brown ferric oxide on Iron by the low temperature of sedation in the presence of water is called rusting

process by which heat is transferred by movement of heated fluid such as air water is called convection

acid turns blue Litmus Paper into red and base turn red litmus paper into blue when blue Litmus Paper is put into the base the colour remain blue and when red litmus paper is put into acid it remain red

Answer 2

Answer:

b. rusting is reaction of metals with water

c.transfer of heat by density difference