Name the one which happens slowly.
Magnesium ribbon is burnt
Explosion of a fire cracker
Rusting of iron
Paper burns
Change of seasons is a _________ change.
Man made
Natural
Slow
None of these
What new materials are formed when a candle burns?
Melted wax
Water and carbon dioxide and soot
No new materials are formed
___________ is the conversion of a liquid into its vapour state at any temperature below its boiling point.
Evoporation
Boiling
Condensation
Growing of plant into a tree is a __________ change.
Chemical
Physical
Desirable
Tooth decay is an example of a _________ change.
Fast
Undesirable
The changes which are brought and controlled by man is called:
Pick the odd one out.
Pen
Electric bulb
Pencil
Feather
How can you change burnt paper back into its original form?
Cool it
Scrape off the soot
You can't