What volume of hydrogen will be produced at STP by the reaction 673 g of magnesium with
excess water according to the following reaction?
Mg +2H20 --> Mg(OH)2 + H2

100%sorry if i’m wronghope this good luck: )

Coal i believe hope this

Aphysical change is one that you can put in and remove like a ham sandwich. the stuff you put in there can be changem its not permanet. a chemical change is on that can't be change thats permanet. like when you make a cake and bake it. you can't get those ingredients back.