Observe preparation of dishes at your home . Identify two changes that can be reversed ?
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Answered by
65
Chemical changes result in production of new substances, these changes cannot be undone. E.g restoring ashes from burning firewood back to the original state of the wood.
On the other hand, there are changes that can be reversed only by other chemical changes.
For example, you can undo tarnish on copper pennies by putting them in vinegar.
Other reversible changes include dissolving salt in water, melting for example melting metal.
Some revesable changes can be done by separating out through filtering and evaporating.
On the other hand, there are changes that can be reversed only by other chemical changes.
For example, you can undo tarnish on copper pennies by putting them in vinegar.
Other reversible changes include dissolving salt in water, melting for example melting metal.
Some revesable changes can be done by separating out through filtering and evaporating.
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5
cold water into hot water
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