Question

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what is reaction?​

Answer 1

Explanation:

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a chemical process in which substances act mutually on each other and are changed into different substances, or one substance changes into other substances."a chemical reaction caused by a build-up of particular sodium salts"

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Answer 2

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One example of a synthesis reaction is the combination of iron and sulfur to form iron(II) sulfide: Another example is simple hydrogen gas combined with simple oxygen gas to produce a more complex substance, such as water.