## Answers

N2 02 X element X element □ compound X pure substance □ homogeneous mixture compound X pure substance homogeneous mixture heterogeneous mixture solution heterogeneous mixture solution N2O Air (mostly N2 and O2) □ element X compound X pure substance □ homogeneous mixture □ heterogeneous mixture element □ compound □ pure substance X) homogeneous mixture □ heterogeneous mixture X solution solution

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