After incubation at 20 c, calculate the value of BOD5 in mg o2/L using manometer for 432 ml of water sample that has been taken from moderately polluted river. if the volume of the umber bottle is 500ml and the reading from the cap was 30, where R is 0.082 L. atm/ k. mol note ; 1 mole of O2 is equal to 32 gm​

Which of the following statements is true about planck’s law

Plz choose one of the compounds from the table and explain how you know the numbers of atoms in your formula. is it possible for two different compounds to be made from the exact same two elements? why or why not? with a limited number of elements (less than 120 are known), does this mean we also have a small number of compounds or do we have a large number of compounds in this world?

How could a student test the effect of removing heat from a gas that is stored in a sealed container? what must occur in order for matter to change states?