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Chemistry 5th year
Chemistry Ms. Lennon
| Question | Answer |
|---|---|
| Dalton's Atomic Theory | Daltons Atomic Theory may be stated as follows, 1. All matter is made up of very small particles called atoms. 2. All atoms are indivisible. They cannot be broken down into simpler particles. |
| Crookes | Cathode ray experiments - Maltese cross - Paddle wheel |
| Thompson | -Discovered electron -e/m formula |
| Stoney | He coined the name 'electron' |
| Miligan | Oil drop experiment discovered charge of electron |
| Rutherford | Bombarded small particles with alpha particles (helium nucleus, 2protons and 2 neutrons) and discovered small positively charged particles were given out , protons. |
| Rutherford | Gold foil experiment, Discovered nucleus and put forward the idea of an atom as having a dense positively charged nucleus and an electron cloud surrounding the nucleus. |
| Chadwick | Bombarded beryllium with alpha particles and discovered that neutral charged particles were released called neutrons. |
| Name equipment to view emission spectra | Spectrometer and spectroscope. |
| Salt colours -flame test Lithium | Crimson |
| Salt colours -flame test Potassium | Lilac |
| Salt colours -flame test Barium | Green |
| Salt colours -flame test Strontium | Red |
| Salt colours -flame test Copper | Green/blue |
| Salt colours -flame test Sodium | Yellow |
| What is an energy level | An energy level is defined as the fixed energy value that an electron in an atom may have. |
| Ground state | The ground state of an atom is one in which the electrons occupy the lowest available energy level. |
| Excited state | The excited state of an atom is one in which the electrons occupy higher energy levels that those available in the ground state. |
| E2-E1 = Hf | E2 = Excited state, E1 = ground state, H = Planck's constant f = frequency |
| Heisenberg's uncertainty principle | States that it is impossible to measure at the same time both the velocity and the position of the electron |
| An orbital | is a region in space within which there is a high probability of finding an electron |
| A sublevel | A sublevel is a subdivision of a main energy level and consists of one or more orbitals of the same energy. |
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mlennon
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