jaibean1202
18.06.2021 •
Chemistry
For a sample of gas in an enclosed cylinder at constant pressure, if the volume of the gas increases then the temperature of the gas:
A. Increases
B. Decreases
C. Remains constant
D. Cannot be determined
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Ответ:
the following are essential factors to be considered when choosing a solvent for crystallization
1. The crystallization solvent should not dissolve the substance to be purified at room temperature, but it should dissolve it well at the solvent’s boiling point
2. The solvent should dissolve soluble impurities well at room temperature.
3. The solvent should not dissolve insoluble impurities even at the solvent’s boiling point.
4. The solvent must not react with the substance to be purified .