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14 Cards in this Set
- Front
- Back
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What is an isotope?
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When an element has more than one possibility for the number of neutrons, these are called isotopes
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What is an atomic number?
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Number of protons in the nucleus; defines the identity of element
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What is the atomic weight or mass of a substance?
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The number of protons plus the average number of neutrons in that element (red #)
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What is a mole?
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basic measuring unit in chemistry that identifies the number of particles in a given amount of matter
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What is the number 6.02 x 10(to the 23rd) also known as?
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Avogadro's number
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What is molar mass?
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Molar mass is the weight of one mole ((or 6.02 x 10(to the 23rd power) molecules)) of any chemical compounds. Molar masses of common chemical compounds that you might find in the chemistry laboratory can range between 18 grams/mole for compounds like water to hundreds of grams per mole for more complex chemical compounds.
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What is an atom?
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The smallest unit of matter that can exist of an element
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What does amu stand for?
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Atomic Mass Unit
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What defines an element?
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The number of protons in the atom. For instance if an atom has six protons, it is carbon. If it has 92 protons, it is uranium.
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Define relative atomic mass
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This is the smallest unit of mass we use in chemistry, and is equivalent to 1/12 the mass of carbon-12. To all intents and purposes, protons and neutrons weigh 1 a.m.u
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How do you designate an isotope?
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One designation consists of the name or symbol of the element followed by a hyphen and the mass number of the isotope; thus the isotope of carbon with mass number 12 can be designated carbon-12 or C-12.
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Define average atomic mass
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The weighted average of the atomic masses of the different isotopes of an element
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Define nuclide
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An atom that is identified by the number of protons and neutrons in it's nucleus
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Define nuclear forces
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A short range proton-nuetron, proton-proton or neutron-neutron force that holds the nuclear particles together
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