CHANGE IDENTIFICATION
breaking of glass
what change physical/chemical?
physical
it is soapy to touch
base
hydrogen symbol?
H
Object moving at constant speed. what motion?
Uniform
vinegar and baking soda ?
What change?
chemical
it ia more corrosive dilute/concentrated
concentrated
Na
Sodium
Two ancient devices to measure time
Any relevant two
RIPENING OF FRUITS?WHAT CHANGE?
PHYSICAL/CHEMICAL AND REVERSIBLE/IRREVERSIBLE
CHEMICAL IRREVERSIBLE
It is used in labs- mineral acid/organic acid?
mineral
Cu
Copper
What is the speed of the object when the object is at rest?
zero
MELTING OF WAX IN THE CANDLE.WHAT CHANGE?
Physical/chemical and reversible/irreversible
PHYSICAL/REVERSIBLE
Acid used as preservative?
vinegar/benzoic acid/any relevant answer
H2SO4 - NAME?
Sulphuric acid
MODE OF HEAT TRANSFER IN SOLIDS?
CONDUCTION
Why is burning of candle a chemical change?
Wax vapours formed cannot be reverted back
Caustic means---------
dangerous
FeSO4
Iron sulphate
Prefer black/white cloth in summer? why?
white, reflects more light