Dung dịch X chứa 0,12 mol Mg2+; 0,1 mol Fe3+; a mol Cl- và b mol SO42-. Cô cạn X thu được 31,4 gam muối khan. Cho BaCl2 dư vào X thu được m gam kết tủa. Giá trị của m là?

Which process does not require the presence of a physical substance in order to transfer heat? air in the atmosphere is heated by the ground. this warm air then rises, and cooler air falls. this is an example of what type of process? how is conduction different from radiation?

Heat is the total potential energy of a substance that can be transferred. true false

Which item is most likely part of the safety contract