How does the quantum model of the atom differ from Bohr's model of the atom? A.
The quantum model describes orbitals as three-dimensional shapes, whereas Bohr's model described electron orbits as flat, circular paths.

B.
Bohr's model applied only to hydrogen, and the quantum model applies only to metals.

C.
Bohr's model assumed a positively charged nucleus, but the quantum model does not.

D.
Bohr's model showed that electrons constantly move away from the nucleus, but the quantum model shows the opposite.

They are all decomposition reactions.

Mass is the amount of matter in an object.  weight is the measurement of the pull of gravity on an object.  say for example, you travel to the moon which has a different gravitational field compared to the gravitational field of earth. (gravitational fields: earth = 1, moon = 0.165)  now when you are on the moon, the pull of gravity on you is different than on the earth. and as weight is the measurement of the pull of gravity on an object, that means yes, your weight can and will change on the moon.  however, on the moon, on earth or even on jupiter, the amount of mass inside of you remains the same. meaning your physical mass remains constant.  in conclusion it is possible for your weight to change as your mass remains constant. 

The product formed when bao and h2o  react together is                        ba(oh)2that is  bao + h2o = ba(oh)21 mole of    bao    react  1 mole of h2o  to    form  1 mole  of ba(oh)2