Cho m gam KMnO4 tác dụng với HCl đặc dưthu được 6,7 lít Cl2 ở dktc. H=80%.giá trị m là

Which statement is a reason to support population regulation? a) it is unethical for us to control birth control rates b) humans have the freedom to produce as many children as desired c) the gap between the rich and poor has been narrowing since 1960 d) billions more people on the earth will intensify many environmental and social problems

Which of the following signs of a chemical reaction are observed in the reaction of potassium with water? precipitate formed temperature change smell produced gas produced color change

Is a chemical message sent by another individual.