hjohnsonn102010
19.12.2019 •
Biology
Which of these changes is a chemical change?
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Ответ:
Examples are burning , rusting, rotting , cooking etc.
Explanation:
A chemical change is a change accompanied by a change in the chemical composition of the substances involved. Chemical changes are irreversible changes that brings about rearrangement of the atoms of one or more substances and a change in their chemical composition. An entirely new substance is usually formed when chemical reaction takes place.
In a chemical reaction a chemical change occur and a new product is formed .In a chemical reaction heat is usually released or absorbed from the surrounding .Examples of chemical change are burning of wood, rusting , cooking and rotting . Like the case of burning of wood you will notice that an entirely new substance is formed that is very different from the initial substances that took part in the reaction.
Ответ:
It is #4 I just took the test.