Chemical elements are not mixtures (I do not think to the isotopic composition).
No a mixture is by definition not a pure substance.
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Chromium (Cr, element #24) is a pure substance. Elements and compounds are pure substances.
No, it is a mixture of tons of different elements
Sulfur is an element. Elements are not mixtures.
Sulfur is an element. Elements are not mixtures.
Neon is a pure substance. Elements and compounds are pure substances; mixtures are not.
no because it is a mixture and combine with other elements.
Crude oil is a complex mixture of hydrocarbons, as well as small amounts of sulfur, nitrogen, and other elements. Therefore, it is considered a mixture rather than a pure substance.
Oxygen is not a mixture, it is a pure element. Air, however, is a mixture of many different elements. In other words, oxygen only has oxygen in it. Air has oxygen, nitrogen, carbon, hydrogen, and other elements in it.
Chlorine bleach is a mixture composed of water, sodium hypochlorite, and other chemical compounds. It is not a pure substance because it is made up of different elements and compounds.
No. Helium is an element, which makes it a pure substance.