B: 51
Oracle Prep sorts past-paper questions by topic, so you can drill Stoichiometry and see which topics are most likely to come up next.
Sign up free →Questions and mark schemes are from past examination papers and remain the copyright of the exam board. How Oracle Prep builds its content
An element, E, forms a hydride, EH₄, which contains 90.0% by mass of E. If the relative atomic mass of hydrogen is 1,…
A piece of chalk has a mass of 23.0g. Chalk is impure calcium carbonate. When analysed, the chalk is found to contain…
Four compounds are shown. Which pair of compounds have the same empirical formula?
The diagram shows a reaction scheme. ethene + steam catalyst → compound X acidified potassium dichromate(VI) → compou…
How does the number of carbon, hydrogen and oxygen atoms in an ester differ from the total number of carbon, hydrogen…
The two statements are about the fractional distillation of crude oil. The statements may or may not be correct. They…