Atoms Flashcards
1
Q
John Dalton’s Atomic Theory
A
- all matter is made of atoms
- atoms of same element have the same size, mass and properties
- atoms can’t be subdivided, created, or destroyed
- atoms of different elements combine in whole # ratios to make compounds
- in chemical reactions, atoms can be combines, separated and rearranged
2
Q
Nuclear force
A
When particles in nucleus get very close, they have strong attraction
3
Q
Plum pudding model
A
- Scientists passing electric currents through gases to test conductivity
- used cathode- ray tubes
- noticed that when currents was passed through a glow or ray was produced
4
Q
Qualities of ray produced
A
- exsisted- shadow of glass when object placed inside
- had mass- paddle wheel placed inside moved
- negatively charged- rays behaved the same way around a magnetic field as conducting wire, repelled by negatively charged object
5
Q
Gold foil experiment- finding nucleus
A
- Rutherford shot alpha particles at a very thin piece of foil
- predicted it would go right through foil
6
Q
Molar mass
A
Mass of one mole of a substance
7
Q
Law of conservation of Mass
A
Mass is neither created or destroyed during regular chemical or physical changes
8
Q
Bohr Model problems
A
- didnt explain spectra of atoms with more than 1 electron
- didnt explain chemical behavior of atoms
- linked atoms electron with emission spectrum
