Fill in the blanks.
Experiment and ___________ are the two important basics of chemistry.
________ fan are fitted near the roof of the walls to expel _________ gases.
We observe chemical processes to observe ___________.
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Explanation:
Experiment and observation are the two important basics of chemistry.
Exhaust fan are fitted near the roof of the walls to expel warm gases.
We observe chemical processes to observe chemical changes.
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