MATERIAL
REVERSIBLE/IRREVERSIBL
OBSERVATIO
S
E CHANGES
N AFTER
MIXING
Bicarbonate of
sodat water
Answers
Answer:
he primary science curriculum requires children to explain that some changes result in the formation of new materials, and that this kind of change is not usually reversible. This includes changes associated with burning and the action of acid on bicarbonate of soda.
An irreversible change is one where a chemical change has taken place and a new material/materials have been formed. The original substances cannot be got back easily using separation techniques.
One of the most well known examples of this is adding bicarbonate of soda to vinegar and observing the change. Here the solid sodium bicarbonate (bicarbonate of soda) reacts with acetic acid (vinegar) to produce carbon dioxide, water and sodium acetate.
Reversible changes usually involve a physical change, rather than a chemical one. This could be a change of state or it could involve mixing two or more things together. In this case, it is possible to get the original materials back using separation techniques, such as filtration, sieving or evaporation.
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