In connection with the topic
"CHEMICALS AND CHEMICAL CHANGES"...the students performed experiments
to understand the physical and chemical changes students were given a mixture
of sulphur and iron powder and were asked if they could separate, they separated
by using a bar magnet and concluded that physical changes are reversible.
Students were given sodium
hydroxide pellets and dilute HCL, they added and found the reaction occurring
and inferred that chemical changes are irreversible.
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