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H2 + o2 + heat = h2o

It is showing 2 characteristics, change in temperature and change in state

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Is it true that Each chemical reaction fits into only one of the five major categories of chemical reactions?

No, this statement is not accurate. Chemical reactions can often exhibit characteristics of more than one type of reaction or may not fit neatly into any specific category. The classification of chemical reactions can be subjective and some reactions may have aspects of multiple categories.


Why is oxygen necessary for so many chemical reactions?

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Chemical reactions are the result of what?

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Nuclear reactions release more energy than chemical reactions because they involve changes in the nucleus of an atom, where much larger amounts of energy are stored compared to the energy stored in the electron shells involved in chemical reactions.


In nonliving systems chemical reactions can be sped up by adding?

The most common way to speed up chemical reactions in non-living systems is to add heat. Heat causes the molecules to move faster, creating more collisions. In some reactions, extra oxygen is used to speed them up.


In situations involving equal masses reactions produce more energy than chemical reactions.?

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