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When do chemical reactions happen?

Answer 1

When reagents interact with each other.

Breaking of existing bonds (electrovalent or covalent), and the formation of new bonds, resulting in the creation of new compounds, with the release or absorption of energy, results in a chemical reaction. (exothermic or endothermic).

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Answer 2

Jeremiah Adams

Chemical reactions are defined as the rearrangement of atoms to form new substances as a result of the formation or breaking of chemical bonds between atoms; these reactions usually occur when reactant molecules collide with sufficient energy to cross the activation energy barrier.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.