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4. Quick lime (Calcium Oxide) Reacts with water to form Calcium Hydroxide (Slaked lime)
5. 2Mg + O2 ---> 2MgO
6. BaCl2 (Aqueous) + Na2SO4 (Aqueous) ----> BaSO4 (Precipitate) + NaCl
7. Chemical reactions must be balanced so it follows Law of Conservation of Mass.
It also helps in predicting amount of reactants needed incase there is a Limiting reagent.
Explanation:
4. The first one is basically hardening.
5. Most combination reactions are good examples.
6. Barium and Na are swapping it's places and A precipitate is also formed as product.
7. Read the answer.
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