Chemistry Past Questions and Answers

The Arrhenius equation expresses the relationship between the speed of a reaction and its

When dissolved in water, NaOH flakes show

CU₂S_(s) + O_2(g) → 2CU_(s) + SO_2(g)
What is the change in the oxidation number of copper in the reaction above?

The product of the electrolysis of dilute sodium hydroxide using platinum electrodes are

The solubility of a salt of molar mass 101g at 20^oC is 0.34 mol dm^-3. If 3.40g of the salt is dissolved completely in 250cm³ of water in a beaker, the resulting solution is