Chemistry Past Questions and Answers

A mixture of NaCI<sub style='font-size: smaller;'>(s)</sub> and CaCO<sub style='font-size: smaller;'>3(s)</sub> is best separated by

What is the basicity of the acid in the followed reaction? NaCO + 2CHCOOH → 2CH COONa + H<sub style='font-size: smaller;'>2</sub>O + CO<sub style='font-size: smaller;'>2</sub>

(a) List two properties of alpha particles.<br/>(b) X is an element which exists as an isotopic mixture containing 90% of \(^{39}_{19} X\) and 10% of \(^{41}_{19}X\).<br/>(i) How many neutrons are present in the isotope \(^{41}_{19}X\)?<br/>(ii) Calculate the mean relative atomic mass of X.

(a)(i) State the two main processes involved in the manufacture of oxygen from air<br/>(ii) Name the type of chemical bonding which exists between oxygen atoms in a molecule of oxygen<br/>(b) What term is used to describe the relationship between oxygen and ozone (O\(_3\))?

(a) List two industrial uses of concentrated tetraoxosulphate (VI) acid<br/>(b) The diagram below represents the set-up for the electrolysis of dilute tetraoxosulphate (VI) acid. Use it to answer Questions (i) to (iii).<br/>(i) Which letter on the diagram represents the battery?<br/>(ii) Write an equation for the reaction occurring at the cathode<br/>(iii) What product does V represent?<br/><br/>