Will you please check my answers?

Substances or mixtures? 1. Carbon Dioxide = M
2.salt water =M 3. table salt = M
Homogeneous or Heterogeneous Matter-
1. flat soda pop = Heterogeneous 2. aluminum foil = Homogeneous 3. black coffee = Homogeneous 4. beach sand = heterogeneous 5. pure air= homogeneous 6. spaghetti sauce - homogeneous

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