Physical and Ch...

Physical changes like boiling do not make new materials and are easily reversed e.g. by cooling, which causes ________.

Rust forms on:

Weight of crucible + weight of magnesium wire = X (before heating)
Weight of crucible + weight product magnesium oxide = Y (after heating)
Which of the following option is correct?

The change which is permanent and can not be measured by just reversing the condition is known as:

Which of the following is not a physical change?

An example of a chemical change is:

Which salt is obtained from the evaporation of sea water?

What is a chemical change?

A man painted his main gate made up of iron, toi) Prevent it from rusting.ii) Protect it from sun.iii) Make it look beautiful.iv) Make it dust free.