Chemistry

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by katieechols45206
Last updated 4 years ago

Discipline:
Science
Subject:
Chemistry
Grade:
11

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Chemistry

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Helium- Discovered by Sir William Ramsay in London. Helium is one of the so-called noble gases. It's used for filling balloons as it is a much safer gas than hydrogen. One of the recent largest uses for helium has been for pressurising liquid fuel rockets.Coins- Zinc, copper, nickel are the elements that make coins. Coins have been used for many years. They are cosidered "money" or "change" and are used to purchase items.

1. All matter is made of atoms. Atoms are indivisible ' indestructable.2. All atoms of a given element are identical in mass ' properties.3. Compounds are formed by a combination of two or more different kinds of atoms. 4. A chemical reaction is a rearangment of atoms.

1. He proposed one of the first theories that attempted to describe the things around us.2. Empedocles argued that all matter was composed of four elements: fire, air, water, and earth.3. The ratio of these four elements affected the properties of the matter.

Atomic Discovery

John Dalton: Father of Atomic Theory.

Empedocles: Greek Philosopher

The expirements that changed Atoms.

J.j. Thomson/ Electrons: Constructed a glass tube which was partially evacuated i.e. much of the air was pumped out of the tube. Then he applied a high electrical voltage between two electrodes at either end of the tube. He detected that a stream of particle (ray) was coming out from the negatively charged electrode.Rutherford/Proton: In his gold experiment he bombarded a beam of alpha particles on an ultrathin gold foil and then detected the scattered alpha particles in zinc sulfide screen. The results were most of the particles pass through the foil without any deflection, some of the alpha particles deflect at small angle, very few even bounce back. James Chadwick/Neutrons: His experiment included projecting alpha particles toward Beryllium "the light element". The emitted particles after enduring the Beryllium target becomes neutrons and fall on the paraffin wax.The paraffin wax in turn releases another type of particle protons. At that time atoms were thought to be made up of protons and electrons.


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