Chemistry Past Questions and Answers

Chromatography is used to separate components of mixtures which differ in their rates of?

Which of the following is a example of a chemical change?

The number of hydrogen ions in 4.9 g of tetraoxosulphate (IV) acid is?<br/>(S = 32, O =16, H = 1, Na = 6.02 x 10<sub style='font-size: smaller;'>23</sub>

What volume of oxygen will remain after reacting 8cm<sup style='font-size: smaller;'>3</sup> of hydrogen with 20cm<sup style='font-size: smaller;'>3</sup> of oxygen?

A gas sample with an initial volume of 3.25 dm<sup style='font-size: smaller;'>3</sup> is heated and allowed to expand to 9.75 dm<sup style='font-size: smaller;'>3</sup> at constant pressure. What is the ratio of the final absolute temperature to the initial absolute temperature?