Select all the compounds below that contain ionic bonds. (Cross out/delete compounds that are not ionic.) 1. NaCl(s)
2. O2(g)
3. Fe (5)
4. HCl(aq)
5. CuCl2 (s)

Which metals are called noble metals

The characteristics of two different types of reactions are shown below: reaction a: electrons are gained by the atoms of an element. reaction b: protons are lost by the atom of an element. which statement is true about the atoms of the elements that participate in the two reactions? their identity changes in both reaction a and reaction b. their identity changes in reaction a but not in reaction b. their identity changes in reaction b but not in reaction a. their identity remains the same in both reaction a and reaction b.

An unknown insoluble substance displaced the water shown. it's mass is indicated on the triple beam balance. mass = a. 694 b. 693.5 c. 693.0 d.693.8