a pure substance is that which contains same atoms or same molecules..
Pure Iron is called Pure iron.
Iron is a pure metal.
heterogeneous pure?
because the elements are pure so I can says to element 'pure'
Uranium is a natural chemical element, a pure element.
It is a pure substance.
it is a mixture
Sugar
It is a molecule of the substance.
Diamond ( an allotrope of carbon) is the hardest material known.
Sodium is a metal, very reactive, with a silvery-white appearance.
There are many types of sugar molecules. What you buy in the grocery store is mostly one type of molecule. Its purity is regulated by the FDA (in the USA). As such, there are certain quantities of impurities that are allowed. That being the case, you have to interpret the question. Yes, it is pure to a degree, since it meets FDA requirements. To say that the sugar is absolutely pure--that's another story. What is between the sugar crystals? Air, right? Is air pure? No, it is a mixture of several different gases. Practically nothing is absolutely pure. If you feel that you can argue that point then say "No, sugar is not pure." otherwise accept that the question probably is asking if sugar fairly pure or pure to a standard and answer "Yes, sugar is pure. It says 'Pure Cane Sugar' right on the side of the bag."
light if low heavy if high -peace
Carbon dioxide (CO2) is dissolved into the soda, as the carbon dioxide escapes a fizzing effect is produced.
That would be moisture in the oil.
Gold id an element, symbol Au (see the periodic table.) All elements are substances but very few substances are elements.
first we eat the baby chicen then we eat the yolk and spit it out leaving a nice slimmy stubstance then we make a hard white shell and put the yolk in it.