Chemical changes are considered unseen because they occur at the atomic level, changing the actual structure of the thing.
Explanation:
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Of which reaction may I ask? And do you mean 1-bromo-2-methylcyclohexane??
<span>Cations mix with anions, so you know NH4+ won't mix with K+ and SO4(2-) won't miix with F-. For the reason that NH4+ and F- together have single charges, they'll mix in a 1:1 ratio, NH4F. There's two charges on SO4(2-), so it'll need two K+ to mix with, K2SO4.</span>
