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10 Cards in this Set
- Front
- Back
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What does Dalton's Atomic Theory state?
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An element is composed of only one kind of atom, and a compound is composed of particles that are chemical combinations of different kinds of atoms.
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What are all elements composed of according Dalton?
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tiny indivisible particles called atoms
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Characteristics of atoms that are of the same element?
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atoms of the same element are identical. The atoms of any one element are different from those of any other element.
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What did Dalton's theory say about atoms of different elements?
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Atoms of different elements canphysically mix together or can chemically combine with one another in simple whole number ratios to form compounds.
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How small is an atom?
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The smallest particle of an element that retains the properties of the element it was divided from. ie copper example p 108
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One important change of Dalton's original atomic theory is?
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Atoms are not known to be divisible. They can be broken down into even smaller , more fundamental particles.
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What are electrons?
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Electrons are negatively charged subatomic particles
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who discovered Electrons and when?
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The English physicist, Thomas did in 1897.
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what is a cathode ray?
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a stream of electrons produced at the negative electrode( cathode) of a tube containing a gas at low pressure.
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What is a cathode?
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the electrode at which reduction occurs.
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