Chemistry Past Questions and Answers

If 20 cm<sup style='font-size: smaller;'>3</sup> of distilled water is added to 80cm <sup style='font-size: smaller;'>3</sup> of 0. 50 mol dm<sup style='font-size: smaller;'>-3</sup> hydrochloric acid, the new concentration of the acid will be

Consider the reaction represented by the equation. 2NaHCO<sub style='font-size: smaller;'>3(s)</sub> \(\rightarrow\) 2Na<sub style='font-size: smaller;'>2</sub>CO <sub style='font-size: smaller;'>3(S)</sub> + CO <sub style='font-size: smaller;'>2(g)</sub> + H<sub style='font-size: smaller;'>2</sub>O<sub style='font-size: smaller;'>(g)</sub> what volume of carbon (IV)oxide at s.t.p is evolved when 0. 5 moles of NaHCO<sub style='font-size: smaller;'>3</sub> is heated? [Molar volume = 22.4 dm<sup style='font-size: smaller;'>3</sup> at s.t. p]

Considered the reaction: H<sup style='font-size: smaller;'>+</sup><sub style='font-size: smaller;'>(aq)</sub> + OH <sup style='font-size: smaller;'>-</sup><sub style='font-size: smaller;'>(aq)</sub> → H<sub style='font-size: smaller;'>2</sub>O<sub style='font-size: smaller;'>(l)</sub>. The energy change taking place in the reaction above is enthalpy of

Which of the following processes is an endothermic reaction?

Which of the following aqueous methods cannot be used to distinguish between a strong acid and a a weak acid?