Discover Questions

How do you work out which is which for sodium carbonate, sodium chloride, sodium sulphate and sodium nitrate by looking at it? Precipitates? If there are 10 items to choose from, and 4 are "winners", what are the odds of picking atleast one of the winners with 2 chances? Convert (-5,2) to polar coordinates? How can I destroy the Danube River? A car is said to go "zero to sixty in six point six seconds". What is its acceleration in m/s2?