Science Year 6

What is reversible change


A temporary change is reversible material

that has undergo a reversible change can

still return to its original form. No new


substance is formed. Such a change is also

known as a physical change


What is irreversible

A permanent change is irreversible. A


material that has undergone an irreversable

change cannot return to its original form. A


new substance is formed because of the

change. Such a change is also as a chemical

stage.



What are mixtures

When different substances are combined


such that no chemical changes occur, a

mixture is formed. The properties of the
individual substance in a mixture do not

change

reversible ireversible

butter cooked rice
cooked chicken
chocolate
ice fried egg
) rust

How to separate solid mixtures

Method one: By hand- If one or both of
the object can be held by hand.
Method two: by sieving-Of both the
object are different in size.
Method three : using a magnet- If one
of the object in magnetic.

How to separate solid and
liquid?

Method 1: Evaporation- only works if the
solid is salt or sugar

Method 2: Filtering- works on most solid
and liquid.

1) What are the difference
between reversible and
irreversible

Reversible Irreversible

Can return to its cannot return to
original state its original state

Most physical All chemical
changes are changes are not
reversible
reversible