Explanation:
because in the right side there is 2 hydrogen( H) and 2 chloride (Cl) to balace them we have to replace 2.
26. B
27. D
28. C
Hope this helped ☺️
You would want to make sure that you have controlled the variables properly, and if you determine that you did then you would repeat the experiment to be sure of the results.
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Radon is <span>not a source of air pollution related to human activities</span>
