C1 Flashcards
Soild
Can not be compressed
Regular arrangement
Strong intermolecular forces between particles
Vibrate
Close together
Liquids
Weak forces between particles
Close together
Move freely
Random arrangement
Cannot be compressed
Gas
Random arrangement
Far apart
No forces between particles
Move freely and quickly
Why do you scientists use models PPD
Problem solving
Prediction
Develop understanding
Limitations of the particle model
Two-dimensional
Don’t take account size of particles
Don’t include forces between particles
Proton
Relative mass 1
Relative charge +1
Nucleus
Neutron
Relative mass 1
Charge 0
Nucleus
Electron
Relative mass 0.0005
Relative charge -1
Electron shells
Atom size
Radius 1x10-10m
6.022x10 23 g Avogadro number
What did Dalton discover
The elements are made up of atoms
What did JJ Thompson discover
He discovered the electron. He also made the plum pudding model That showed that atoms of positives spheres with electrons scattered inside of it
What did Rutherford discover
By firing positive alpha particles at gold foil some were deflected and some bounced back. This showed that there was a positively charged nucleus with electrons orbiting it
What did Neil Bhor for discover
discovered that electrons are found in fixed energy levels or electron shells
What is the mass number
Protons+neutrons
What is the atomic number
Protons or electrons