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5 votes
A chemical reaction in which two or more substances undergo a chemical union to form a more complex substance is a _______ reaction.

A. substitution
B. combination
C. decomposition
D. double replacement

2 Answers

3 votes
The answer is B. combination

User Josh Randall
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7.9k points
5 votes
I believe the correct answer is B. Combination.
User Zjyhjqs
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