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Answered 2017-11-14 18:29:09

Check the melting or Boiling point. If the melting and boiling point is more or less than the original melting or boiling point the substance is impure.

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Pure water will freeze at a higher temperature than a mixture containing water. Therefore, if a means for extracting energy from a sample of pure water is the same as a means for extracting energy from a sample of a mixture containing water, the pure water will freeze first.


A pure substance is a sample of matter that has definite physical as well as chemical properties. A pure substance can be either a single compound, or a single element.


This water is named ultrapure water or Kohlrausch water.


Pure water has a pH of about 7.


The properties of a pure substance do not vary from sample to sample because there is no reason for them to. Why would they? Water is water, and if you take any sample of water from any stream, lake or ocean and remove all the "stuff" in it to leave only the water, all the samples will behave the same way physically and chemically. The chemical properties of a substance (and the physical ones, too) are set by what the substance is. And these properties define the way the substance behaves in the universe as a whole. There is no reason for any water found on, say Mars, to behave any differently than any water here on Earth - or anywhere else in the universe.


Pure water is a compound, which is distinguished from a mixture by the fact that the same mass proportions between the constituents hydrogen and oxygen is always the same in any size sample of water and that neither constituent has in water all of the chemical and physical properties that the particular constituent has in a mixture of the two elements.


There are several measures of purity, depending on available insturmentation. Color - the more color the less pure the water. Turbidity - the cloudier the water the less pure the water. Conductivity - the higher the conductivity the less pure the water. pH - the further you get above or below pH of 7, the less pure the water. Beyond these simple measures, it takes various specialized instruments to monitor-for / detect contaminants such as nitrate, arsenic, and so on. There are some kits that can detect some contaminants, but usually a "grab sample" is obtained in a clean sample bottle and sent to a laboratory for analysis.


You can determine if a sample of gold is pure by comparing the sample's density with that of pure gold.


For example to establish a zero point for an instrument or to make a measurement on water considered as a pure sample.


To test if adding salt to water increases the boiling point of the water, do the following: boil a sample of pure water until it boils. Measure the temperature at which the pure water boils. Take another sample of pure water and add salt to it, then boil this sample under the same conditions. Measure the temperature at which the salt water boils. If the latter temperature is higher, salt does increase the boiling point of water.


no, pure water is absolutely clear. it doesnt have any color whatsoever. if there is a yellowish color, it means there are impurities in the sample.


A sample of any pure element is homogeneous.



Pure distilled water is not a good conductor of electricity. It is the impurities in water (usually salts) that conduct electricity. In fact, the conductivity of a sample of water can be used to measure the concentration of salts in the water sample.


The molecular formula of water is H2O. The atomic mass of H2O is 2(1.0) + 16.0 = 18.0Amount of H2O = mass of pure sample/molar mass = 75/18.0 = 4.17mol There are 4.17 moles of water in a 75 gram pure sample.


They are aqueous solutions of various compounds in water, so they consist of many separate pure substances. Many of these can be separated by simple physical means (filtering, evaporating, centrifuge).


Dissolve the mixture in water sift out the sand then boil the water and the salt will be left.


no, because pure water has an even number of H+ ions and OH- ions that have all bonded to form H2O.


A physical property is a characteristic of a pure substance. Water is an example of a pure substance.



A pure substance or chemical substance is a material that is homogeneous and has constant properties throughout the sample. Water and pure hydrogen are pure substances as well as pure honey (with nothing added).


Culligan's motto is 'Better Water. Pure and Simple.'.


can not make a sample of calcium


No you cannot make a pure sample of Fluorine because it is an earth made element.


Water is colourless, odourlers, and tasteless. Pure water has a boiling point of 100oC