chemstry C1
- Created by: Tayyba.123
- Created on: 07-12-17 17:18
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- C1: PARTCLES
- developing the atomic model;
- in 1803, Dalton's slid atom. he discovered electron's.
- in 1897, Thomson's plum pudding model. he discovered the nucleus.
- in 1909, Rutherford's planetary model. he came up with mathematical models.
- in 1913, Bohr's energy levels model. he discovered proton and then neutron.
- subatomic particles..
- proton have a relative mass of 1 and relative charge of +1.
- neutron have a relative mass of 1 and a relative charge of 0.
- electron have a relative mass of 0.0005 and a relative charge of -1.
- the particle model
- solid
- very close together, in regular arrangement and vibrate around fixed positions.
- liquid
- close together, in random arrangement and move around each other.
- gas
- far apart, in random arrangement and move quickly in all directions.
- forces between particles...
- parties held together by electrostatic forces of attraction (bonds)
- limitatons of the particle model...
- doesn't take into account; forces between particles, size of particles and space between particles.
- solid
- atomic structure...
- when two oxygen atoms join togeher they make an oxygen molecule.
- bond length(middle point from one atom to the middle point in the other atom this bonded) and atomic radius in the order of 10 to the power of -10m
- chemical symbol
- mass= number of proton + number of neurons
- atomic number= number of protons
- isotopes...
- atoms of an element with the same number of protons and electrons yet different number of neutrons.
- chemical and physical changes...
- physical changes are reversible and DO NOT MAKE NEW SUBSTANCES !
- chemical changes are irreversible and DO MAKE NEW SUBSTANCES !
- developing the atomic model;
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