In an experiment, 50cm3 of a 0. 1 mol dm-3 metallic saltreacted with 25cm3 of 0. 1 mol dm-3 aqueous sodium sulfate. New oxidation state of salt if it was 5 before.

Agas at 155 kpa and standard temperature has an initial volume of 1.00 l. the pressure of the gas rises to 500 kpa as the temperature also rises to 135°c. what is the new volume? 2.16 l 0.463 l 0.207 l 4.82 l

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation:

Which of the following is not an assumption that scientists must make about the natural world? a. regularity b. causality c. predictability d. plausibility