-
332
Airstotle (332 BCE)
Aristotle was born in Stagira Greece. One of his many experiments was using balls to roll down a slanted plane, this was so it was slow enough for him to have time to measure it without using up to date measuring instruments. This is very interesting Aristotle was the first humanbeing to notce hibernation in animals the food chain and so on. In Airstotle model there were only two forces conflict and harmony. -
406
Empedocles 406 BC
Empedocles was born in Acragas Sicily. One of Empedocles experiments was to see if air actually existed. He used a clepsydra, a vessel with a hole on the top and the bottom. Doing this he put the bottom hole of the vessel under the water. He then realised that the vessel filled up with water.
He explained to himself if he put his finger on the top of the top hole then no water would come in at the bottom, but once he took his finger off the water would flow through again. -
460
Democritus (460 BCE 370 BCE)
Democritus was born in Abdera, the leading Greek city on the northern coast of the Aegean Sea.
Democritus lived and in worked in Abdrea Greece, he lived there from about 460 to 370 BCE.
Democritus did a very simple experiment what he did was collect a simple seashell and break it in half.
He then took that half and broke it in half and kept breaking it until it was powder.
He realised that you couldnt break the shell anymore. -
Issac Newton (1642-1747)
Issac Newton was born in Lincolnshire England. Issac performed a lot of experiments on the creations of light. He found out that the white light can be seen in the same order of colours as the rainbow. Issac had discovered that heat is molecular motion, and even though such heat is made when the different molecules that attract to each other are assorted. So their undeveloped energy is translated into kinectic energy as they move towards one another. -
John Dalton (1766-1844)
John Dalton was born in Cumberland England (1766-1844).
He went on to calculate atomic weight from percentage compositions of compounds.
He used a system called an artibary system to decide the likely atomic structure of each compound. He said that if there were two elements that can combine their combinations will occur in a set sequence.
He also stated that the first compound will have one atom of A and two atoms of B; the next, two atoms of A and one of B and that will keep occurring. -
Antione Lavoiser 1772-1774
Antione was born and lived in Paris. Antione’s experiements that he performed showed that the comobined masses of mercury and oxygn was equal to the mass of calx of mercury. Antione couldn’t figure out a way to break oxygen down, so he said oxygen must be an element. We owe a lot of credit to Antione he produced the first table of elements which includes a large mass of sunbstances that chemists today would agree and class them as elements -
Robert Brown
Robert was born in Montoe and lived there for most of his life. Robert performed a lot of experiments with organic and inorganic material. He would then make sure it is powder before putting it in water. He then told the world such movement to be a common property of matter in that state. After his famous discovery, the Brownian movement was made and published in 1828. He then reaveled that he noticed moving particles in the pollen grains Clarkia pulchella. -
Michael Faraway
Michael Faraday was Born in Newington which is now London. Michael completed a lot of experiments one of his many was the coil experiment
He made a colil by winding around a paper cylinder with wire. He then connected the coil he had just made to a galvanometer, and then moved a magnet back and forth inside the cyclinder. This was to test his hypothesis of saying that a changing magnetic field is necessary to induce a current in a near by circuit. -
William Crookes
William's life started when he was born in London. In 1861 William discovered the element thallium. One of Williams greatest experiments would have been the discovery of a lime green band in the spectrum of selenium, it was an element that hadn’t belonged to any known element of that moment. After years of researching, he achieved in singling out the element and was able to name it thallium. William studied and researched the outcome of sending an electric current through a sealed gas tube. -
Ernest Rutherford (1871-1937)
Ernest Rutherford was born and lived in New Zealand. One of Ernests first experiments was peformed on a Plum pudding model. He let off energecti particles at foil, he then measured the bounce they had as the came out of the other side. He then was able to get some information from the structure of foil. The discovery of the Radiocactivity proved that the atoms were heavier than the elements. It was also said that the decay had different types of radiation. -
Niels Bohr (1885-1962)
Neils Bohr was born and grew up in Copenhagen. His atomic structure was made from postivley charged nucleus, encompassed by negatively charged electrons. That move around the nucleus in a circular fashion. He also stated that an electron could drop from a higher energy orbit to a lower one, ejecting a photon of discrete energy in the process. This was the main point for the quantum theory. -
J.J Thomson
Joseph John Thomson was born in 1856, in a place called Cheetham Hill Manchester England.The first experiment was to build a cathode ray tube with a metal cylinder on the end. He figured out that by applying a magnetic field across the tube there was no activity documented by the electrometers and so the charge had been bent away by the magnet. J.J Thomson's finding of the electron in 1897 showed us that this atom can broken into tiny pieces. His atomic model was called the Plum pudding model. -
Hans Geiger
Hans Geiger was born in Germany in 1882.
He measured the deflection of the alpha particles. Which was usually directed straight onto the sheet of thin gold foil. The alpha particles should have been defelcted by the sheet, this was under the success of the plum pudding model.
It showed that a lot of the particles were deflected through a lot of the angles, some bigger than 90 degrees.
1925 was when he proved the exsistence of the Compton effect.The Geiger counter was used to to measure radioact -
James Chadwick
James Chadwick was born in Bollington. James first experiment that he did was to see if two protons and two neutrons would compel with each other. James experiment was to launch neutrons and protons towards beryllium. After they had been realesed onto the Beryllium, the particles were now neutrons and would fall on the paraffin wax and then would turn into protons. Chadwick discovered the neutron in 1932.
James was sure the atom would have a neutron. -
Erwin Schrodinger
Erwin Schrodinger was born in Vienna Austria. Erwin established a very different experiment in which a cat was both dead and alive at the same time. Erwin was trying to demonstrate the restrictions of quantum mechanics. He said that atoms can be in two or more different quantum states as the one time. He was sure that a cat which is made up of a large number of atoms could not be in two different states at the exact same time.
