particle model Flashcards
When/who were electrons discovered
1897, JJ thompson
what was thompsons model 1897
plum pudding- ball of positive charge, negative charges mixed in with the ‘dough’
when/who discovered that alpha particles could bounce back
1909 ernest rutherford
what did ernest rutherford conclude
an atoms mass is concentrated in the centre (nucleus) which contained protons, some particles passed through so there was empty space,
who discovered that electrons fly around the nucleus at fixed distances
niels bohr
when/who discovered neutrons
james chadwick, 1932
when atoms absorb radiation, where do they move on the energy level
higher, further away from the nucleus
when atoms emit radiation, where do they move on the energy level
down, closer to the nucleus
what equation inlvoves density, mass and volume
density= mass/volume
what does the law of displacement suggest
an object completely submerged in a fluid will replace the amount of fluid equal to its own volume
what is the kinetic energy store
comes from random motion of particles
what is potential energy store
comes from PE stored in bonds between particles
what is latent heat
energy that is transferred to a substance without the temperature changing
what is specific latent heat
latent heat per 1kg
what is the equation involving energy, mass and specific latent heat.
energy= mass x specific latent heat
what happens to the kinetic energy in gas when the temperature increase
it increases, which increases speed of particles, which increases the amount of collisions and the force of the particles, which exerts more pressure
