Hnr Chem Chpt 3 Test
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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| Chemical Reaction | The transformation of a substance or substances into one or more new substances.
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| Law of Conservation of Mass | Which states that mass is neither created nor destroyed during ordinary chemical reactions or physical changes.
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| Law of Definite Proportions | A chemical compound contains the same elements in exactly the same proportions by mass regardless of the size of the sample or source of the compound.
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| Law of Multiple Proportions | If two or more different compounds are composed of the same two elements, then the ration of the masses of the second element combined with a certain mass of the first element is always a ratio of small whole numbers.
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| Atom | as the smallest particle of an element that retains the chemical properties of that element.
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| Nuclear Forces | These short-range proton-neutron, proton-proton, and neutron-neutron forces hold the nucleus particles together.
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| Atomic Number | Number of protons of each atom of that element.
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| Isotopes | Different # of neutrons
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| Mass Number | The total number of protons and neutrons that make up the nucleus of an isotope.
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| Hyphen Notation | Name of Element - Mass of a Number
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| Nuclear Symbol | Superscript = mass number & Subscript = atomic number
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| Nuclide | A general term for a specific isotope of an element.
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| Atomic Mass Unit | Exactly 1/12 the mass of a carbon-12 atom.
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| Average Atomic Mass | The weighted average of the atomic masses of the naturally occurring isotopes of an element.
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| Mole | Amount of a substance that contains as many particles as there are atoms in exactly 12g of carbon-12
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| Avogadro's number | 6.022 * 10^(23) -- the number of particles in exactly one mole of pure substance.
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| Molar Mass | The mass of one mole of a pure substance.
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