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How could you positively identify a compound using only melting point determinations?
I do not believe that any chemist would choose to identify a compound by using only the melting point; why create such difficulties for yourself?
Why is it misleading to identify a solid compound just from a lone melting determination?
Identifying a compound based solely on its melting point is misleading because different compounds can have the same melting point. Additional tests, such as spectroscopic analysis or chromatography, are required to accurately determine the compound's identity. A single melting point determination is not sufficient as it could lead to a wrong conclusion about the compound present.
Which property could be used to identify a compound in the laboratory?
Depending on the method many chemical or physical properties can be used. Examples: spectra of emission, color of ions in solution, formation of some precipitates, melting point, density, etc.
What information can be obtained from the melting point of a compound as an industrial chemist?
As an industrial chemist, the melting point of a compound can provide information about its purity. A sharp melting point indicates high purity, while a broader range could suggest impurities present. This data is crucial for quality control, identifying unknown substances, and determining the suitability of a compound for specific applications.
How could you use the physical properties of melting and boiling point to identify a substance?
If you know the melting point and boiling point of a substance, you could look them up in a table to see what substances have those melting and boiling points. In practice, there are lots of other tests you'd probably want to do in addition, because in general there's no guarantee that an unknown substance is a single pure compound.
Why should you should never use taste or touch to identify bases?
A compound could be caustic and burn your mouth and tongue.
Can you give me a sentence with the word compound in it?
Bus-stop is a compound noun. Water is a compound made of oxygen and hydrogen
Which organic compound has melting point of 122.3-123.0?
hey my lil nova net dude...i have no idea what the answer is but you can cook some brownies for me and we will be friends.
An unknown compound gave a melting point of 230 Cwhen the liquid solidifiedthe melting point was redetermined and found to be 131Cwhat might have caused this change?
Pressure can affect melting points.However, assuming that your conditions are the same, you may have changed the crystal structure of your compound.The crystal structure of a compound can affect its melting point. For example, diamond and graphite are both forms of elemental carbon. Diamond is a face-centered cubic structure. Graphite, however, is hexagonal. Graphite has a melting point of 3652°C, whereas diamond melts at 3550°C. When you liquified your compound, it because amorphous and lost its crystal structure. It may have recrystallized into a different structure.Heating may also have effected a chemical change. If you saw bubbles or a color change, you likely made a new compound.
How would you determine the purity of the solid crystals in crystallization?
One of the easier and more reliable ways to check if a solid compound is pure after re-crystallization is to check its melting point. Impurities will always lower the melting point of a sample, and the more impure, the lower the melting point will be. By checking the melting point of your sample with a reference value from a book or reliable internet source, it can be determined exactly how impure the sample is. If perhaps your compound is unknown, and thus are unable to obtain a reference value, you could obtain melting point of the sample, and then re-crystallize a few more times, obtaining a new melting point each time, until it is unchanged by re-crystallizing. This will of course decrease your yield, but if there is little fluctuation in your series of melting points, you can be sure you have a relatively pure sample.
What is white crystalline compound called?
A white crystalline compound could be a wide range of substances, such as salt (sodium chloride), sugar (sucrose), or aspirin (acetylsalicylic acid). More specific information is needed to identify the compound accurately.
What might have happened if you are measuring the melting point and the compound disappears?
It could have sublimed... and turned directly from a solid into a gas instead of melting first. Compounds such as iodine, carbon dioxide and others do this readily.See the Related Questions to the left for more information about sublimation.
