8) Which compound contains polar covalent bonds?
a) MgCl2
b) BaF2
c) CHE
d) SiO2
e) O2

Which statement correctly describes metallic bonds? a. they form when certain atoms lose electrons and other atoms gain electrons. b. they involve an attraction between anions and cations. they always involvpoth a metal and a nonmetal. d. they can only form between atoms of the same element. e. they form because electrons can move freely between atoms.

The atomic number, or number, is the described as the number of in the nucleus of an chemical element.

How can a give a full method for the experiment of separating sand from water by filtration? 1-materials 2-steps 3-conclusion also for water and salt separated by the evaporation or distillation process