CHEMESTRY
Storyboard Text
- Empedocles(IV Century b.C)
- Matter is made of water, earth, fire and air
- Aristotle
- All substances are made of small amounts of these four elements of matter. Earth, Fire, Water, and Air.
- Democritus and Leucippus (V Century b.C)
- All matter was composed of small indivisible particles called atoms
- John Dalton (1766 - 1844)
- 1 Matter is made of atoms. Atoms are invisible.2 Compounds are formed by a combination of 2 or more atoms 3 A chemical reaction is a rearrangement of atoms
- J.J Thomson (1856 - 1940)
- The atom consists of a positively charged sphere where most of the mass of the atom resides and which electrons are embedded (Plus pudding)
- Discovered the electron by experimenting with a cathode ray machine The atom is composed of electrons surrounded by a soup of positive charge to balance the electrons
- Ernest Rutherford (1871 - 1937)
- The atom consists of a central core nucleus Electrons orbit the nucleus In an atom is always the same number of protons and electrons so atoms are electrically neutral Protons resides in the nucleus and have positive charge
- He discovered neutrons and protons
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