ChemistryWiki | RecentChanges | Preferences
Here are answers to CP Homework After Dalton thru Bohr.
1a) JJ Thompson experiment:
- He added high energy to two pieces of metal in a vacuum and it produced a green glow.
- He then put a magnetic on one need and the green glow bend away from "-" end of magnetic.
- He changed the power of magnetic and green glow bend more or less depending on power of magnetic.
1b) What did the results of his experiment explain with respect to atom.
- Green glow was not light.
- It must be a particle that came from inside atom of metals.
- Particle is negatively charge.
- We call it an electron.
1c) Plum Pudding Model, atom is made of electron (negatively charged particles) and rest of atom is postively charged.
2a) oil dropping, electron's actual mass and charge
2bi) proton (p+), located in nucleus, 1.67E-24g
2bii) electron (e-), located outside nucleus, 9.11E-28g
2biii) neutron (n0), located in nucleus, 1.67E-24g
3) Goldstein
4) Chadwick
5a) see notes
5b)
- Rutherford "shot" small "+" bullets at gold leaf (closest to 1 atom thick) and surround gold leaf in 3 dimensions with coated paper that glowed "green" when hit by "+" bullet.
- Coated paper used degrees of deflection to indicate where "+" bullet hit it. 0 degree deflection = straight thru gold leaf and >90 degree means bounce back from gold leaf.
- Found a few bounced back that indicated that there is something small volume, massive (most mass of atom) and "+" charge.
5c) nucleus = small volume, massive and "+" charge.
5di) CP does not do
5dii) CP does not do
5e) see notes
5e) electrons are outside of nucleus (where protons and neutrons are located).
6a) Electrons
6b) ENERGY of an electrons = DISTANCE AWAY FROM NUCLEUS of electron.
6c) see notes
6d)
- Atom in Ground State (all electrons in lowest energy level available)
- Atom absorbs specific energy packet size that is used for an electron to go from a lower energy to a higher energy level.
- Atom is now in excited state (NOT all electrons in lowest energy level available).
- Instantly, electron falls back down to original lower energy level (atom back in Ground state).
- Atom emits that specific energy packet size from atom
6e) Electron still revolve (in their energy level though) around nucleus like planets around sun.