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Chemistry 13 Online
OpenStudy (anonymous):

Choose the answer that best describes what kind of substance air is. heterogeneous mixture homogeneous mixture

OpenStudy (asib1214):

homogeneous mixture

OpenStudy (anonymous):

homogenous mixture

OpenStudy (midhun.madhu1987):

Homogeneous Mixture because the different components of air have fixed quantity. Eg. Nitrogen - 78%, Oxygen - 21% etc..

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