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Diffrent Models Of Matter Timeline

Science Class Mr Clark

Alexandra Purdy

on 19 February 2013

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Transcript of Diffrent Models Of Matter Timeline

About 450 B.C Greek Scholar Empedocles proposed matter was made up of four elements: Earth, Air, Water, Fire.

-When these four elements are mixed together they can create new substances.

Empedocles demonstrated that air is a form of matter because it takes up space although it is invisible. About 400 B.C -Democritus discovered matter was made up of tiny particles that could not be broken down further.

-He later called the tiny particles atoms. after the greek word "atomos" which means invisible.

-He believed different elements were composed of different kinds of atoms.

-His ideas were never accepted because Socrates did not accept them. About 350 B.C -Philosopher Aristotle believed more in Empedocles theory of the four elements, rather then the recent theory.

-Aristotle influenced many people throughout his numerous writings on the four elements.

Aristotle later made the "four element" model accepted nearly 2000 years later. About 300 B.C About 250 B.C About 200 B.C About 150 B.C About 100 B.C About 50 B.C 0 About 50 Ad About 100 Ad About 150 Ad About 200 Ad About 250 Ad About 300 Ad About 350 Ad About 400 Ad About 450 Ad About 500 Ad About 550 Ad About 600 Ad About 650 Ad About 700 Ad About 750 Ad About 800 Ad About 850 Ad About 900 Ad About 950 Ad About 1000 About 1050 About 1100 About 1200 About 1250 About 1300 About 1350 About 1400 About 1450 About 1500 About 1550 About 1600 About 1650 About 1700 About 1750 About 1800 About 1850 About 1900 About 1950 About 2000 About 2050 -Alchemists are combinations of philosophers, mystic, magician and chemist.
-Alchemists invented many laboratory equipment we use today such as: beakers,filters, stirring rods, and distillation apparatus.
-Alchemists also created chemical symbols for substances that we know would recognize today as elements and compounds.
-Although many different substances were found the Alchemists still accepted the four-element model A.D. 500-1600 -Scientist Robert Boyle did not believe in the four element model.

-Instead he gave a new definition for the word element:"I mean by element simple unmitigated bodies".

-This is now the modern definition for a pure substance.

-Joseph Priestley was the first person to isolate oxygen scientifically without knowing it was an element.

-Antoine Lavoisier later experimented with Priestley oxygen. He later concluded that air was a mixture that involved oxygen.

-Henry Cavendish experimented mixing metal with an acid. This had created a flammable gas that was lighter then air known as hydrogen.

-Henry later found out through experimenting with hydrogen that his gas would would burn in Priestleys oxygen, producing water.

-It was believed up until this point that water was an element. Late 1700s 1808 1831 -Michael Faraday discovered that electric currents could cause chemical changes in some compounds in solution.

-Atoms could gain electric charges and form charged ions.

-Faraday had modified Dalton's atomic model by stating:- Matter must contain positive and negative charges.
-Opposite charges attract and like charges repel.

-Atoms combined to form molecules because of electrical attractions between atoms. 1904 -J.J. Thompson revised the atomic model further to explain electrons.

-He had also experimented with beams of much heavier positive particles known as protons.

The new model became known as the "raisin-bun Model" Which stated:
-Atoms contain particles called electrons.
-electrons have a small mass and negative charge.
-The rest of the atom is a sphere of positive charge.
-The electrons are embedded in this sphere so that the resulting atoms are neutral or uncharged.

-Scientist H Nagaoka modeled the atom as a large positive sphere surrounded with a ring of negative electrons. 1911 -Ernest Rutherford created a new model called the nuclear model.

-The nuclear model stated:
-An atom has a tiny dense positive core called the nucleus(Which deflected the alpha particles and contains protons.)
-The nucleus is surrounded mostly by empty space, containing rapidly moving negative electrons(through which the alpha particles passed through unhindered.)

-Rutherford had discovered this new model through an experiment he did. He aimed a type of radiation called alpha particles at a thin sheet of gold foil.

-He predicted that all the particles would pass right through the foil however a small amount of alpha particles had bounced back. -John Dalton published a theory of why elements differ from each other and from non elements.

His theory stated:
- All matter is mad of atoms which are particles to small to see.
-Each element has its own kind of atoms .
-Compounds are created when atoms of different elements link to forum molecules.
-Atoms can not be created, destroyed or subdivided in chemical changes.

-His theory stated that matter was made of elements. Different Models of Matter By Alexandra Purdy Thanks for Watching :)
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