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what must occur for a change to be a chemical reaction?

tember - 5 October HW_2 estion 19 Which of the following can be classified as a mixture? t yet answered irked out of 1.00 Sel
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Answer #1

1 )- For a change to be a chemical reaction a new compound must be formed and chnage must be irreversible .

2 ) -- And air can't be classified as a pure substance because it's homogeneous mixture of many gases such as oxygen , nitrogen , carbon dioxide etc. While rest option are pure in nature

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