Chemical Equations - Test for Anions

1. hydrogen and oxygen are which of the following in a chemical reaction?
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2. In a chemical reaction of hydrogen and oxygen, water is the?
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3. The total mass of the products of a chemical reaction is the same as the total mass of the reactants is known as?
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4. In any chemical reaction, “matter is neither created nor destroyed, but merely changes from one form to anotherâ€‌ is known as?
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