Chemistry Past Questions and Answers

Oxygen demanding wastes a considered to be a water, pollutes because they; ____________

Mortar is NOT used for underwater construction because ____________

What weight of sodium hydroxide is required to make 500 cm<sup style='font-size: smaller;'>3</sup><br/> of 0.2 M solution? <br/>[Na=23, 0=16, H = 1]

\(60 \mathrm{~cm}^{3}\) of hydrogen are sparked with \(20 \mathrm{~cm}^{3}\) of oxygen at \(100^{\prime} \mathrm{C}\) and I atmosphere. The total volume of the residual gas is

\(0.16 \mathrm{~g}\) of methane when burst raises the temperature of \(100 \mathrm{~g}\) of water by \(40^{\circ} \mathrm{C}\). What is the heat of combustion of methane if the heat capacity of water is \(4.2 \mathrm{Jkg}^{-}\) \({ }^{1} \mathrm{C}^{-1} ?\left[\mathrm{CH}_{4}=-16<br/>ight]\)