What is the concentration of a solution, in parts per million, if 0.02 gram of na3po4 is dissolved in 1000 grams of water?
(1) 20 ppm (3) 0.2 ppm
(2) 2 ppm (4) 0.02 ppm

Which of these statements explains the difference between nuclear binding energy and the strong nuclear force ?

1) which of the following is the best example of a physical change? a) sugar dissolving in tea b) firefly glowing 2) in the combustion of ethane, what is/are the reactants? c2h6 + o2 ==> co2 + h2o a) c2h6 and o2 b) co2 and c2h6

Asample of hydrated tin (ii) chloride (sncl2) has a mass of 4.90 g. when it is dehydrated, it has a mass of 4.10 g. which is the correct chemical formula for the hydrate? sncl2•2h2o          sncl2•4h2o          sncl2•6h2o