Alchemists
alchemist's contributions to modern day science
What is
discovered elements and symbols, came up with a "scientific method" and devised apparatus used today
what is empedocle's theory?
what is
everything is composed of four elements. Earth, Air, Water, Fire
who was Antoine Lavoister?
what is
he was a tax collector, concluded that mass is always conserved in a chemical reaction
muffin model
a small circular atom with little electrons in it.
neutron
what is
neutrons = nothing
what did the alchemists try to accomplish?
what is
tried to turn base metals into gold, tried to find a substance that ensured eternal life, and tried to find a universal solvent
what is Democritus's theory?
what is
everything is composed of tiny, invisibles particles called Atoms, Atoms of different substances had different shapes and sizes
who was Henry Cavendish
what is
he discovered a flammable gas that was lighter that air (Hydrogen)
nuclear model
what is
The centre (nucleus) is positively charged with electrons circling around it and most of the atom is empty space.
proton
what is
Protons = positive
what were the alchemist's first elements?
what is
Iron, Tin, Mercury, Lead, Silver, Sulphur
what was Aristotle's theory?
what is
he agreed with Empedocles but added a fifth element called Aether, he also believed in transmutation which is the ability to change one object into another object
who was JJ Thompson?
what is
he determined that the particle in the cathode ray tube weighed much less than an atom that there was a smaller particle, Dalton was wrong, the atom is not the smallest, the first sub-atomic particle was discovered, this led to the creation of the Electron
bohr diagram
what is
electrons orbited the nucleus in energy levels
electrons
what is
electrons = negative
when were the alchemists?
what is
500 CE to 1600 CE
who was Robert Boyle?
what is
he believed in transmutation, made the definition of an element, called simple bodies
who was Niels Bohr?
what is
he said that electrons orbited nucleus in energy levels made the “Bohr diagram” of an atom, the number of electrons in each level follows the formula 2n2
empedocles' model
what is
a small rectangle with the four elements at the corners combining in the middle
sub-atomic particles
what is
a particle smaller than the atom
what are alchemists?
what is
people known as "doctors or scientists" in the olden days
who was Joseph Priestley?
what is
he was first to isolate oxygen by decomposing HgO
what was John dalton's modern atomic theory?
(all 4 points)
what is
1. all matter is made up of indivisible particles called atoms 2. Matter cannot be created or destroyed 3. Atoms of the same element are the same. Atoms of different elements are different 4. Atoms can bond to form compounds and compounds can break apart.
gold foil experiment
what is
placed a radioactive material in a led box with a hole and found that radiation only came through the hole, these particles are known as alpha particles which are always positive. Gold foil experiment which then allowed him to discover the nuclear model. Gold foil experiment he shot an alpha particle at gold foil and most went through but some bounced off so he thought of a new model of the atom called the nuclear model. The centre (nucleus) is positively charged with electrons circling around it and most of the atom is empty space.
alpha particle
what is
alpha particles are radiation particles that are always positive