cho 98g dd H2SO4 20% vào 400g dd CaCl2 5,2% tính khối lượng kết tủa tạo thành tính nồng độ phần trăm của các chất trong đd sau khi tách bỏ kết tủa

In any energy conversion, some of the energy is lost to the environment as question 5 options: electrical energy potential energy sound energy thermal energy

Iknow #2 is d. i just need to know why

Which statement best describes the oxidation numbers of the atoms found in magnesium chloride? a. magnesium has a 2- oxidation number and chlorine has a 1+ oxidation number. b. magnesium has a 2- oxidation number and chlorine has a 2+ oxidation number. c. magnesium has a 2+ oxidation number and chlorine has a 1- oxidation number. d. magnesium has a 1+ oxidation number and chlorine has a 1- oxidation number.