Physices some of p1 flashcard 20 stopped doing p3
What did JJ Thomson discover about the atom
that it wasn’t a solid sphere and electrons
Who created the plum pudding model
JJ Thomson
What did Ernest Rutherford discover about the atom
Nucleus was very small and has a positive charge and atom is mostly empty space
Who did the gold foil experiment with Ernest Rutherford
Geiger and Marsden
What did Niels Bohr discover about the atom
electron shells
What’s the size of the atom
1 × 10 to the power of -10
What’s the size of the nucleus
1x10 to the power of -23
Relative mass of proton
1
Relative mass of neutron
1
Relative mass of electron
so small we count it as 0
Relative charge of proton
1
Relative charge of neutron
0
Relative charge of electron
-1
What’s a molecule
a group of atoms bonded together
Formula for density
density = mass / volume
What’s an average density
A solid object on a fluid and if it has a lower average density than the fluid
1ml=?cm3(cube)
1
The formula for a cylinders volume
π x radius2 x height
How do you finds any objects volume (experiment)
Submerge an object in water and it will displace a water of equal volume
Most matter has the same amount of what
Positive and negative charges
When 2 materials are rubbed together what happens
Electrons are transferred from one to another
What happens to the electrons if the materials rubbed together are conductors
The electrons will transfer from one to another so they stay neutral
What happens to the electrons if the material rubbed together are insulators
Electrons can’t flow so a positive static charge is left on the object that lost electrons and a negative charge left on the one that gained the electrons
What always moves in static electricity
Electrons/ negative charges
What happens if enough charge builds up
It can move suddenly causing sparks or shocks
