Which is a balanced single replacement reaction? A 3 Mg + 2 H20-3 MgO + 2 H2
B. 2 Mg + 3 H20—2 MgO + 3 H2
c. 2 Mg + H20—2 MgO + H2
D. Mg + 2 H20 — 2 MgO + H2
E. Mg + H20 — MgO + H2

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.

Density and pressure