properties of gases

[bridgettefb]

I would like to know which of the following mixtures would be most likely to produce carbon dioxide? Mg+HNO3, Na2Co3+H2SO4 or H2+O2+Cu?

[bridgettefb]

When divers exhale beneath the surface of the wateer, bubbles rise to the surface. explain this behavior?

[KathChem82]

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I would like to know which of the following mixtures would be most likely to produce carbon dioxide? Mg+HNO3, Na2Co3+H2SO4 or H2+O2+Cu? 


it's Na2CO3 + H2SO4. This is the only reaction among the choices that contains both carbon and oxygen, the components of carbon dioxide.

[KathChem82]

When divers exhale beneath the surface of the water, bubbles rise to the surface. explain this behavior?

gases are less dense than water. This means the gases tend to be on top of the water rather than the water on top of them. This is similar the the oil and water mixture. Oil is less dnse than water that's why when it is combine with water, it floats on water. The gas exhaled by a diver goes up, usually seen as bubbles, as an indication that it is less dense than water.