5. CaCO, - CaO+CO,
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(a) Decomposition: A substance breaks down to smaller species. [e.g. CaCO3(s) → CaO(s) + CO2(g) Decomposition of limestone to calcium oxide (quicklime) and carbon dioxide on heating.]


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The general area of the atom (outside the nucleus) where the e- are located is the — and —

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Shells, electron levels, and electron cloud all fit here.
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