The technical name is comedone. The common name is black heads.
Faces
Impurities in caustic soda solution can be removed by various methods such as filtration, precipitation, or ion exchange. Filtration can remove solid impurities, while precipitation involves adding a chemical to react with impurities and form a solid that can be filtered out. Ion exchange can remove impurities by exchanging them with ions in a resin.
Crystals with more impurities tend to have a cloudy or mottled appearance, while crystals with fewer impurities appear clearer and more transparent. The impurities can interfere with the crystal lattice structure, affecting its overall clarity and color.
the chemicals had so many impurities that they were unable to conduct the tests.
If you think to particles as impurities, non-refinned salt have particles of insoluble impurities.
Suspended impurities are solid particles that are suspended in water and can be removed through filtration methods, while dissolved impurities are substances that are in molecular or ionic form and cannot be removed through filtration. Dissolved impurities can include minerals, metals, ions, and organic compounds.
Not really. One doesn't clean an impurity, one removes it from something. So either "remove all impurities" or "clean (something) of impurities".
Yes, gases can contain impurities such as other gases, particles, or contaminants. These impurities can affect the properties and behavior of the gas and may need to be removed for certain applications.
Coal can contain impurities such as sulfur, nitrogen, ash, and trace elements like mercury and arsenic. These impurities can have environmental and health impacts when coal is burned for energy production.
Organic impurities refer to substances that come from living organisms, such as plants or animals, that contaminate a material or environment. These impurities can include things like sugars, proteins, fats, and other biological molecules that can negatively impact the quality or functionality of a material. In water treatment, organic impurities can be harmful if not removed properly.
Impurities.
The sparkle in minerals is usually caused by their crystal structure and the way they interact with light. When light enters the crystal lattice of a mineral, it can be reflected and refracted, creating a sparkling effect due to the reflection and dispersion of light off the crystal faces. The presence of impurities or inclusions in the mineral can also contribute to its sparkle.