how to work out half equations
Jan 27, 2019 · Plug in ½ for a, use the time for x, and multiply the left side by the initial quantity of the substance. Rearrange the equation so that you’re solving for what the problem asks for, whether that’s half life, mass, or another value. …
writing ionic equations for redox reactions done under alkaline conditions This page explains how to work out electron-half-reactions for oxidation and reduction processes which are carried out under alkaline conditions, and then how to combine them to give the …
Combining the half-reactions to make the ionic equation for the reaction. The two half-equations we’ve produced are: You have to multiply the equations so that the same number of electrons are involved in both. In this case, everything would work out well if you transferred 10 electrons. But this time, you haven’t quite finished.
Convert the unbalanced redox reaction to the ionic form. In this reaction, you show the nitric acid in …
Mar 15, 2009 · Answers. Best Answer: I am doing GCSE too! The only electrolysis half equation you need to know is: Al3+ + 3e- = Al. The 3+ on the left and the – sign on the right are small and at the top like a squared number in maths, I don;t know how to do that on my computer! This equation is the extraction of aluminium for it’s ore, bauxite.
This is the typical sort of half-equation which you will have to be able to work out. The sequence is usually: Balance the atoms apart from oxygen and hydrogen. Balance the oxygens by adding water molecules. Balance the hydrogens by adding hydrogen ions. Balance the charges by adding electrons.
Jan 04, 2008 · Best Answer: since it’s an acid half-reaction, you use these rules: if you need more Oxygens, you add H2O. if you need more Hydrogens, you add H+. if you need to balance charge, use e- (electron) in this one, Cu+ = CuO