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Which is the number in front of chemical formulas that represents the ratio of each substance shown in a balanced chemical equation?
a.coefficient
b. covalence number
c. catalyst

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Coefficient is the number in front of chemical formulas that represents the ratio of each substance shown in a balanced chemical equation.
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Answer:

The correct answer is option a. "coefficient".

Explanation:

In balanced chemical equations, coefficient are written down in front of chemical formulas representing the ratio of each substance. For instance, in the formula of water H2 + O2 → 2 H2O, the "2" represents the coefficient of the substance H2O. If a substance does not have a coefficient written down in front of it, it is assumed that it is equal to "1".

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