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D) The energy and kinds of atoms of the reacting substances
Chlorine gas reacts vigorously with hydrogen gas to form hydrogen chloride. It is commonly known as hydrochloric acid. The gaseous HCl so obtained is a strong acid and ionises almost 100% in water. Fluorine and Chlorine are the most common and most acidic.
Answer:
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Chemical reactions might be fast -- burning gasoline, or slow -- rusting. Usually the require two or more reactants. Most of these, along with requiring more than 1 substance, also requires something to get it started ... burning needs a spark to start it.
Nuclear decay only requires 1 thing, the radioactive element. Wait and it spontaneously undergoes decay.