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30 Cards in this Set
- Front
- Back
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The subatomic particle with the smallest mass is the...
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electron
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The mass number of an atom is equal to...
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total number of protons and neutrons
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The mass of an electron is about 1/1837th the mass of...
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a proton or neutron
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The atomic number is equal to...
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the number of protons
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Avogadro's number
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6.022 x 10^23
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Energy emitted as electromagnetic radiation from matter comes in discrete bundles called...
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quanta
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Energy emitted as quantum is given by the equation...
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E=hf
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The h in E=hf is known as...
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Planck's constant
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Planck's constant
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6.626x10^-34 J/s
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Dalton's atomic theory
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1. All elements are composed of atoms. All atoms of a given element are identical in size, mass, and chemical properties. The atoms of one element are different from atoms of all other elements.
2. All compounds are composed of atoms of more than one element. For any given compound, the ratio of the numbers of atoms of any two of the elements present is either an integer or a simple fraction. 3. A given chemical reaction involves only the separation, combination, or rearrangement of atoms; it does not result in creation or destruction of atoms. |
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Atomic number
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number of protons in an element
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Mass number
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total number of protons and neutrons
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The valence electrons and their activity determine...
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reactivity of an atom
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Determine the number of protons, neutrons, and electrons in a Nickel-58 atom and in a Nickel-60 2+ cation.
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Nickel's atomic number is 28.
Mass number is 58. Nickel-58 has 28 protons, 28 electrons, and 30 neutrons. Nickel-60 has 28 protons, 26 electrons, and 32 neutrons |
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One mole is represented by...
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Avogadro's number
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In nature, almost all elements exist as a collection of two or more...
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isotopes
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Element Q consists of three different isotopes, A, B, and C. Isotope A has an atomic mass of 40u and accounts for 60% of naturally occuring Q. The atomic mass of isotope B is 44u and accounts for 25% of Q. Isotope C has an atomic mass of 41u and a natural abundance of 15%. What is the atomic weight of element Q?
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0.60(40u) + (0.25)(44u) + 0.15(41u)=41.15u
41.15 g/mol |
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Angular momentum of an electron
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nh/2pi
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nh/2pi
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h=Planck's constant
n=quantum number that can be any positive integer only changes with respect to n |
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Bohr's model for the angular momentum related to the energy of the electron
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E=-RH/n^2
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E=-RH/n^2
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RH=Rydberg constant
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Rydberg constant
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2.18x10-18 J/electron
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When proton and electron are separated completely, energy is...
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zero
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Electromagnetic energy of photons in excited state
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E=hc/lambda
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E=hc/lambda
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h=Planck's constant
c=speed of light lambda=wavelength of radiation |
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Speed of light
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3.00x10^8 m/s
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The Lyman series is for..
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ultraviolet spectrum
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The Balmer series is for...
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visible and ultraviolet spectra
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The Paschen series is for...
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infrared spectra
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The Brackett series is for...
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infrared spectra
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