Why is magnesium oxide an ionic compound?

The scales shown in the introduction measure mass, or the amount of matter in a particular object. the scientific law of conservation of mass states that matter cannot be created or destroyed during a chemical reaction, but it can change from one form to another. did the simulation support this scientific law? explain why or why not.

The changes that the students observed, rapid breathing and sweating, would be classified as a to a change in a system.

What will a hypothesis become if supported by repeated expermentation