Which event would be impossible to explain by using John Dalton’s model of the atom? An iron atom emits particles when it is struck by light.
An oxygen atom combines with two hydrogen atoms to form water.
An acid reacts with a base to form salt and water.
The atoms in sodium metal react with water.

What is the number of neutrons in an atom with atomic mass of 35

Which statement justifies that hydrogen peroxide (h2o2) is a polar molecule? the o – h bond is nonpolar and the molecule is asymmetric. the o – h bond is nonpolar and the molecule is symmetric. the o – h bond is polar and the molecule is asymmetric. the o – h bond is polar and the molecule is symmetric.

4al + 3o2 → 2al2o3 what does the "3" in front of o2 stand for? a) it indicates that there are 5 oxygen atoms after you add the coefficient and the subscript. b) it indicates that that there are are total of 6 oxygen atoms all bonded together as a single molecule. c) it indicates that there are 3 oxygen molecules chemically bonded to each other in the reaction. d) it indicates that there are 3 separate oxygen molecules in the reaction.