C: 106
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In an experiment, 1 cm³ of a gaseous hydrocarbon X required 4cm³ of oxygen for complete combustion to give 3 cm³ of c…
What is the concentration of a solution containing 1.0g of sodium hydroxide in 250 cm³ of solution?
An element, E, forms a hydride, EH₄, which contains 90.0% by mass of E. If the relative atomic mass of hydrogen is 1,…
Why is carbon used in the purification of drinking water?
The list shows three chemical reactions. 1 combustion of ethanol 2 fermentation of glucose 3 reaction of ethanol with…
The diagram shows a reaction scheme. ethene + steam catalyst → compound X acidified potassium dichromate(VI) → compou…