Chemistry Past Questions and Answers

Crude copper could be purified by the electrolysis of concentrated copper (II) chloride if the crude copper is?

H<sup style='font-size: smaller;'>-</sup> + H<sub style='font-size: smaller;'>2(I)</sub>O → H<sub style='font-size: smaller;'>2(g)</sub> + OH<sup style='font-size: smaller;'>-</sup><sub style='font-size: smaller;'>(aq)</sub>. From the equation above, it can be inferred that the?

An anhydride is an oxide of non-mental?

MnO<sub style='font-size: smaller;'>4(aq)</sub> + 8H + <sub style='font-size: smaller;'>(aq)</sub> + 5Fe<sup style='font-size: smaller;'>2+</sup> → Mn<sup style='font-size: smaller;'>2+(aq)</sup> + 4H<sub style='font-size: smaller;'>2</sub>O<sub style='font-size: smaller;'>(I)</sub>. The oxidation number of manganese in the above reaction changed from?

Which of the following is TRUE of Le Chatelier's Principle for an exothermic reaction?