Question

the f number of oxygen in the reaction h2 + o2 gives rise to h2o is​

Answer 1

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A chemical change or chemical reaction is a process in which one or more pure

substances are converted into one or more different pure substances. Chemical changes

lead to the formation of substances that help grow our food, make our lives more

productive, cure our heartburn, and much, much more. For example, nitric acid,

HNO3, which is used to make fertilizers and explosives, is formed in the chemical

reaction of the gases ammonia, NH3, and oxygen, O2. Silicon dioxide, SiO2, reacts

with carbon, C, at high temperature to yield silicon, Si—which can be used to make

computers—and carbon monoxide, CO. An antacid tablet might contain calcium

carbonate, CaCO3, which combines with the hydrochloric acid in your stomach to

yield calcium chloride, CaCl2, water, and carbon dioxide. The chemical equations for

these three chemical reactions are below.