Chemistry

Chemistry

1. Vocab

   • Hypothesis
     • A proposed explanation made on the basis of limited evidence.
   • Theory
     • A system of ideas intended to explain something.
   • Law
     • Generalized rule to explain observations.

2. Evidence for the Atom

   • Rutherford
     • Discovered the Nucleus of the Atom.
       • Gold Foil experiment.
   • Thompson
     • Discovered the Electron
       • Cathode Ray experiment.
   • Milikan
     • Discovered the charge
       • Oil drop experiment.
   • Dalton
     • Said that all matter was composed of Atoms.
       • Mixed gas experiment.

3. Subatomic Particles

   • Mass number
     • The mass number is the total number of protons, neutrons, and electrons in an atom.
   • Atomic Number
     • The Atomic number is the number of protons in the atom which also helps discover the element of the atom.
   • Protons
     • Protons are particles in the middle of the nucleus that have a positive charge.
   • Neutrons
     • Neutrons are particles in the orbit around the nucleus, they are neutral.
   • Electrons
     • Electrons are particles in the nucleus of an atom, they have a negative charge.
   • Isotopes
     • It is an element that has a different number of neutrons.

4. Atomic Mass

   • Abundant Isotope
     • Abundant isotopes depend on the percentage of the abundance, the higher the percentage, the more abundant it is.
   • Atomic Mass
     • The Atomic mass is the mass of the Atom.