Tại sao phải học môn hóa học và môn vật lí ?

What are transitions between a liquid and gas called? identify which way they are transitioning

An observation that requires measurement is called quantitative observable or qualitative

Ammonium perchlorate nh4clo4 is the solid rocket fuel used by the u. s. space shuttle. it reacts with itself to produce nitrogen gas n2 , chlorine gas cl2 , oxygen gas o2 , water h2o , and a great deal of energy. what mass of nitrogen gas is produced by the reaction of 2.1g of ammonium perchlorate?