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(i)A sample of white powder (A) is given to a chemistry student.
(ii)She adds deionized water to the powder and some of it seems to dissolve.
(iii)She filters the mixture and saves the solid (B) left on the filter paper.
(iv)She runs an electric current through the solid B and it decomposes to form a soft metal (C) and a green gas (D). Neither the metal nor the gas can be broken down further by chemical means.
(v)The student saves the liquid that ran through the filter in step (iii). When she lets the water evaporate, a white solid (E) remains. When she heats the solid E strongly, it turns into a gas (F) and another white solid (G). Gas F is the same gas exhaled by mammals.
Determine whether A, B, C, D, E, F, and G are mixtures, compounds, elements or “unable to tell from the information provided
Solid B is NaCl while C is metallic sodium and D is chlorine gas (there is only one green gas that is formed by electrical current. There is an outside chance that C would be potassium except that is would have exploded the moment it formed in the atmosphere. Solid E is not an element because it decomposed upon heating. That makes it a compound. Gas F is carbon dioxide (exhaled by mammals), which means that G is probably a metallic oxide although it is impossible to tell from the information given.
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