physical changes and chemical change Flashcards
properties such as shape, size, colour and state of a substance are called its …………………….
physical properties
a change in which a substance undergoes a change in its physical properties is called a ……………………………
physical change
a physical change is generally ……………………change
reversible
in …………………change no new substance is formed
physical change
example of physical change
melting of wax, dissolving sugar in water and crystallisation
alternation of a substance from an original shape, size, and state is called………………….
change
changes which can be reversed are called …………………….
reversible change
changes which cannot be reversed are called………………..
irreversible change
large crystals of a pure substance can be formed from their solutions. this process is called ……………………..
crystallisation
the ………………..layer absorbs UV rays
ozone layer
