Question

some ex of chemical ,physical changes?

Answer 1

Examples of chemical change:-
1. burning wood
2. digesting food
3. mixing acid and base

Examples of physical change:-
1.dissolving sugar in water
2. melting of an ice cube
3. crumpling a sheet of paper

Answer 2

Physical changes-
cutting of wood
Cutting of bark of wood
Cutting of bark of tree
Tearing a paper
Churning cream into butter
Melting of cheese
Galvanization
Expansion and contraction of the railway track.
Change is shape of clay.
Change in size of a spring.
Sublimation
Evaporation
Distillation
Fractional distillation
Cenntrifugation
solubility of a substance
Freezing of water
Melting of ice
boiling of water.
Crystallization
Sand in water
Mud in water
Salt in water.
Change in solubility of a substance
Mixing iron fillings with sulphur powder
Change in melting point or bioling point of water onn adding salt to it.
Chemical changes
Cutting of tree- YES CUTTING OF TREE IS A CHEMICAL CHANGE BECAUSE WE ARE STOPPING ALL PROCESSES OF THE TREE.
displacement reaction
oxidation
reduction
rusting of iron
double dispacement reaction
single displacement reaction
combination reaction
decomposition reaction
endothermic reaction
exothermic reaction
corrosion of various metals
burining of paper
Heating iron fillings and sulphur powder mixture.
Burning of wood.
When magnesium ribbon burns in presence of air to give magnesium oxide.
A reaction between sodium and sulphuric acid
reaction of metals with water
reaction of non metals with water
acid base reaction
neutralization reaction
Double decomposition reaction
reaction of acetic acid and baking powder.
Tarnishing of copper
Sapling growing into a tree.
Human being growing old.
Rotting of leaves
Ripening of fruits.
Curdling of milk.
Baking of bread
Making cheese
Electrolysis