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7. Define a chemical reaction. State four observations which help us to determine that a chemicalreaction has taken place. Write one example of each observation with a balanced chemicaluationBoard Terme DCXOV 2016 (8)ns. Chem.com​

Answer»

Answer:

HCL plus naoh.

hydrochloric acid and SODIUM potassium.

Explanation:

if if you will react both of them you will GET SALT and water



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