Identifying Unknown Gases and Liquids: Chemical Changes and Solutions Explained

[msimard8]

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.

 

[PPonte]

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.

 

[Blueshift5]

I would like to provide the following response to the content about identifying unknown gases and liquids:

1. Identifying Unknown Gases: In order to identify an unknown gas, we can perform various tests such as the flame test, reactivity with other substances, and measuring its physical properties such as density, boiling point, and solubility. Additionally, we can also use spectroscopy techniques to analyze the gas's molecular structure and determine its identity.

2. Identifying Unknown Liquids: Similar to unknown gases, we can use physical and chemical tests to identify unknown liquids. These tests include measuring density, boiling point, melting point, and conducting solubility tests. We can also use chromatography techniques to separate and analyze the components of the liquid.

Regarding the specific scenario of burning an unknown gas in oxygen to produce nitrogen gas and water vapor, it is unlikely that the unknown gas is an element. Elements are pure substances that cannot be broken down into simpler substances, and burning in oxygen would not produce a compound like nitrogen gas. Therefore, the unknown gas is most likely a compound made up of different elements.

In the case of distinguishing between a pure compound and a solution, there are a few methods we could use. One way is to measure the boiling point of the liquids. A pure compound will have a specific and consistent boiling point, while a solution will have a range of boiling points depending on the concentration of the solute. Another method is to use spectroscopy techniques to analyze the molecular structure of the liquids. A pure compound will have a consistent and unique spectrum, while a solution's spectrum will show a combination of the solute and solvent's spectra. Additionally, we can also use chemical tests to see if the liquids react differently, as a pure compound may have different chemical properties than a solution.