Identifying Unknown Gases and Liquids: Chemical Changes and Solutions Explained

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2. An unknown gas was burned in oxygen to produce nitrogen gas and water vapor. Was the unknown gas an element? Explain.

6. You are given two liquids. One is a pure compound, and the other is a solution. How could you distinguish the two liquids?

These are not found in textbook. They are probably simple answers. Any ideas. Help would be appreciated.
 

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I can help you in the first question.

X + O2 --> N2 + H2O

The elements that are in the products must be in the reagents. Therefore, X cannot be an element since you have in the products H and N. It must be a compound of nitrogen and hydrogen.

In what concerns the second question I am not sure. If the solution is heterogeneous is simple to distinguish, but if it is not, I don't know. Sorry.