The results of two tests on solution X are shown. reagent added | observation on adding a few drops of reagent | observation on adding an excess of reagent ----------------|-----------------------------------------|------------------------------------------ aqueous sodium hydroxide | white precipitate | precipitate dissolves aqueous ammonia | white precipitate | precipitate remains Which ion is present in solution X?

The diagram shows a simple laboratory apparatus for the preparation and collection of a dry gas. What is the gas?

Which reaction does not involve either oxidation or reduction?

Which pair of compounds could be used in the preparation of calcium sulfate?

What correctly describes the molecules in very dilute sugar solution at room temperature?

A mixture containing equal volumes of two liquids that mix completely but do not react together is placed in the appa…

Which graph shows the number of electrons in the outer shell of an atom, plotted against the proton (atomic) number f…