Question

reaction - state - reversible - undo - melts - irreversible - dissolves - cool - wood - heat - freeze
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Most changes can be divided into _____ or ______.

Reversible changes are very common, and happen when something changes but you can easily get it back to its original state. An example of a reversible change is when sugar _____. This is because sugar may look and behave differently, but it is still the same chemical.
Other reversible changes are the changes of _______. This happens when a substance evaporates, ______, freezes or condenses. In order to make a substance condense or _____, you need to _____ it down. To make a substance evaporate or melt, you need to ____ it up.

Irreversible changes, on the other hand, are imposible to ______. They happen when there is a chemical ______ and a new substance is made. An example of this is burning ______.

Answer 1

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