Compare and contrast sodium and fluorine?

compare and contrast oxygen and hydrogen?

Work out sian speed for the first 30 minutes of her journey. give your answer in km/h.

Global warming will produce rising sea levels partly due to melting ice caps but also due to the expansion of water as average ocean temperatures rise. to get some idea of the size of this effect, calculate the change in length of a column of water 1.00 km high for a temperature increase of 1.00ºc. note that this calculation is only approximate because ocean warming is not uniform with depth. (answer in ×10^{-3} −3 m)

Avehicle accelerates from 0 to 30 m/s in 10 seconds on a straight road