9. When a piece of steel wool is burned it gains mass. Which explanation is consistent with the law of conservation of mass? A. Matter was created during the chemical reaction,
B. Heat changed into matter.
C. Matter from the air combined with the steel wool.
D. A chemical change did not take place.

your parents i think this could be it

a compound is a molecule made of atoms from different elements.

a. by the combination of an unlimited number of elements

a saline water is fed to a reverse osmosis unit at flow rate o rotameter connected to reject (retentate) line reads 8 installed in reject and permeate line reads 15.2 milli siemens/cm and 300 micro siemens/com respectively.