That depends on the substance. Pure corundum (sapphires) can be determined by their color, which comes from impurities, meaning only the colorless corundum is pure. However, other substances, like water, may contain nonvisible impurities.
pure substance, propanone
A pure substance is classified by having a definite and constant composition. The substance can be either an element or a compound, but what makes the substance pure, is that it does not vary.
it s pure liquid.
I thought it was pure substance. But i recently took a Science Test of these subject(i'm also in 8th grade) and it was the same question...EXACTLY! I put down Pure substance as well but appearantly the answer was "All of the Above" which included A.Pure Substance B.Compound C.Element ... so as long as you can prove it was only pure substance( This was for extra credit to get points back on the test for my teacher) You got the points. In my opinion a Pure Substance is the substance in which there is only one type of particle. I hoped this helped :)
Mixture, because it is mixed with all sorts of chemicals, such as smog, and or pollen.Mixture is NOT a pure substance, because to be a pure substance, it can't be mixed with anything.
No, it is not always possible to determine if a substance is pure just by its appearance. Impurities can be present in small amounts and may not be visible to the naked eye. Chemical analysis is typically needed to accurately determine the purity of a substance.
If a substance is not pure, the density may, or may not, change, compared to the pure substance.
Radioactive waste is nearly always a mixture but it is possible to be a pure substance.
Pure Substances Boil at a Constant Temperature while Mixtures do not, To determine if the Distillate is pure the Liquid distillate would be boiled and for example if the substance is water, it should begin boiling at exactly at 100 degrees celcius if it boils below or above that point it is not a pure substance
pure substance, propanone
One way is if it can be physically combined.
You can check certain properties, such as density and boiling point.
it is a pure substance.... not
Pure substance
Methane is a pure substance.
The best method is chemical analysis.
One simple test to determine if a solid is pure is to measure its melting point. A pure substance will have a sharp melting point, while impurities will cause the melting point to be lower and more spread out. Comparing the measured melting point to the known melting point of the pure substance can help determine its purity.