a chemistry teacher has a 560-cm length of magnesium ribbon. for a class experiment, each student requires an 8.5-cm length of the ribbon. how many students may receive the required length?

What is common about these molecules? a.their atoms are held together by covalent bonds. b.they are all made up of the same two atoms. c.their atoms are held together by ionic bonds. d.they are all made up of oxygen atoms only.

List four observations that indicate that a chemical reaction may be taking place

No copying 15 pts how does a free-body diagram tell you about the net force on an object?