Ateacher describes a mathematical system that can be used to convert the weight of water to the mass of water
what is the teacher most likely describing?
fractions
different measuring tools
scientific notation
dimensional analysis

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.

To present informationto make information easily available 

Hello there,it will only be somewhat eroded (25%)hope this : ))~top

A)  it is neutral because the concentration of hydronium ions equals that of hydroxide ions