Answer:
A-Solid
Explanation:
Waves travel faster in solids & slowest in gases
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Answer:
They have no charge
Explanation:
Basically, They are just there to balance out the number of atoms. But, they don't really do anything else.
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The balanced half-reaction: Cr²⁺⁺(aq) → Cr⁴⁺(aq) + 2e⁻.
Chromium(II) cations two electrons and became chromium(IV) cations.
<span>Oxidation
reaction is increasing of oxidation number of element, because element or
ion lost electrons in chemical reaction.
</span><span>Reduction is lowering
oxidation number because element or ions gain electrons.</span>
