A power station was designed to burn gaseous fuels only.
Which two substances could be used?(its a multiple choice Question)
A)
carbon dioxide and hydrogen
B)
carbon dioxide and 235U
C)
hydrogen and methane
D)
methane and 235U
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Ответ:
mixture
Explanation:
Compound is a pure substance which is made from atoms of different elements combined together in a fixed ratio by mass.It can be decomposed into simpler constituents using chemical reactions. Example: water![H_2O](/tpl/images/0187/9199/8a703.png)
Element is a pure substance which is composed of atoms of similar elements. It can not be decomposed into simpler constituents using chemical reactions.Example: Copper![Cu](/tpl/images/0187/9199/54715.png)
Mixture is a substance which has two or more components which do not combine chemically and do not have any fixed ratio in which they are present.Example: Alloys
As steel is made up of combination of carbon and chromium and are not present in any fixed ratio , steel is classified as a mixture.