kasyan Ch.3,4,5,8
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| 1870 William Crookes | "threw" atoms at a fosflourescent material and found they glowed
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| 1896 Henri Becguerei | discovered radioactivity by placing uranium on a piece of film and there was a spot left. He then figuered out that rays are coming out of the uranium= radio activity
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| 1897 JJ Thomson | proved the existence of electrons and created the plum pudding model of an atom then in 1907 he found the proton
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| 1904 Hantaro Nagoaka | says atoms are like the solar system and said thomsom was wrong
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| 1909 Earnest Rutherfurd | Tried to prove Thomson is right. his plan was to use Crookes device and would shoot radium at it; he then would see it light up and count the atom particles. When he tried almost all of the atoms went to the same place
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| 1913 Neils Bohr | came up with the next model- the quantam model- predicts the shapes of moulecules aswell
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| 1919 Francis Anston | Discovered Isotopes
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| Isotopes | same atom that differs in mass
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| 1932 James Chadwick | discovered the nuetron which explains isotopes *remember James (aka Jimmy) found the nuetron
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| atomic number | The number of protons in an atom
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| How many protons, nuetrons, electrons are in: oxygen | 8,8,8
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| How many protons, nuetrons, electrons are in: sodium | 11,12,11
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| How many protons, nuetrons, electrons are in: lithium | 3,4,3
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| A+B -> AB | synthises
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| AB -> A+B | decomposition
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| A+BC -> B+ AC | single replacement method
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| AB+CD -> CB+AD | double replacement method
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| elements | something composed of one type of matter. Cannot be seperated into simpler materials by chemical means
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| molecule | two or moreatoms bound together chemically
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| compound | two or more different elements combined together chemically
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| mixture | two or more substances that are bound together non chemically
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| inert | an element that doesnt react with other elements
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| ions | electrically charged atoms
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| the proton is bigger than the | electron
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| valence number | combining tendency of an element
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