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38 Cards in this Set
- Front
- Back
Which of the following best represents a pair of isotopes?
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atomic: 7 mass: 13
atomic: 7 mass: 14 |
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In one gram of carbon, one gram of sulfur, and one gram of helium, there are
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more atoms of helium than of sulfur or carbon
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How many oxygen atoms are present in 1.5 moles of glucose, C6H12O6?
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5.4 x 10^24
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Rubidium (atomic weight 85.4678) has two naturally-occurring isotopes, the predominant one being 85-Rb with isotopic weight 84.9117 and an abundance of 72.15%. which of the following isotopic weights is the most likely for the other isotope?
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86.9085
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Which formula is incorrect? (F2, Fe, Ca2, S8, Br2)
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Ca2
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Balanced chemical equations imply which of the following?
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Numbers of atoms are conserved in chemical change
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The limiting reactant in a reaction
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has the lowest ratio of moles available/coefficient in the balanced equation
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2Ag+Br2->2AgBr
According to the equation above, the greatest mass of Ag(s) (molar mass 108 g/mol) that can react with 5.30mL of Br2 (molar mass 160g/mol, density 3.00g/mL) is closest to |
22g
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Which is the empirical formula of the compound that is 92.3 percent carbon and 7.7 percent hydrogen by mass?
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CH
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Which flask contains the smallest number of moles of gas?
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N2, 50°C, 0.5 atm
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C3H8+5O2->3CO2+4H2O
In the reaction represented above, what is the total number of moles of reactants consumed when 1.00 mole of CO2 is produced? |
2.00 mol
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Which of the following statements best accounts for the observation that per mole, calcium chloride is more effective than sodium chloride in preventing the formation of ice on surfaces in winter?
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One mole of calcium chloride produces more ions in solution than one mole of sodium chloride does.
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What is the concentration of Cl- in 4.0L of a 0.12M solution of CaCl2?
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0.24 M
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Cu+HNO3->Cu(NO3)2+NO2+H2O
When the equation above is balanced and the coefficients are reduced to lowest whole-number terms, what is the coefficient of H2O? |
2
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A student prepares a solution by dissolving 60.0g of glucose (180.2 g/mol) in enough distilled water to make 250.0mL of solution. The molarity of the solution should be reported as
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1.33 M
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Which of the following statements must be true about a liquid that has been heated to its boiling point in a vessel that is open to the atmosphere?
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The vapor pressure of the liquid is equal to the atmospheric pressure.
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Which of the following statements regarding atomic theory is NOT true?
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Heisenberg's uncertainty principle describes the equivalence of mass and energy.
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Electromagnetic radiation with the longest wavelength is
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microwave radiation
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Using the Aufbau principle of electron energy ordering, the correct electromagnetic configuration for the gold (III) ion is
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D (76) 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 4f14 5d8
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Has the highest first ionization energy
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1s2
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A neutral atom has the following ground-state electron configuration: 1s2 2s2 2p6 3s2 3p5. The atom is that of an element that is best classified as a
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nonmetal
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For the element strontium, it can be correctly predicted that the greatest difference in ionization energies would be between the
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second and third ionization energies
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Of the following compounds, which is the most ionic?
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CaCl2
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The best explanation for the fact that diamond is extremely hard is that diamond crystals
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are giant molecules in which each atom forms strong covalent bonds with all of its neighboring atoms
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What is the mole fraction of ethanol, C2H5OH, in an aqueous solution that is 46 percent ethanol by mass? (The molar mass of C2H5OH is 46g/mol; the molar mass of H2O is 18g/mol)
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0.25
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The effective nuclear charge experienced by the outermost electron of Na is different than the effective nuclear charge experienced by the outermost electron of Ne. This difference best accounts for which of the following?
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Na has a lower first ionization energy than Ne
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2N2H4+N2O4->3N2+4H2O
When 8.0g of N2H4 (32g/mol) and 92g of N2O4 (92g/mol) are mixed together and react according to the equation above, what is the maximum mass of H2O that can be produced? |
9.0g
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Which of the following substances is LEAST soluble in water?
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BaCO3
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A combustion reaction
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S8 + 8O2 -> 8SO2 (B)
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At 25°C aqueous solutions with a pH of 8 have a hydroxide ion concentration, [OH-], of
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1.0 x 10^-6
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Contains more than one pi-bond
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CO2
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Which of the following bonds would be the least polar yet still be considered polar covalent?
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N-O
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How many of the following molecules possess dipole moments?
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2
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Which of the following has the smallest radius?
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[Ca]2+
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As indicated by Lewis structures, which of the following species could probably not exist as a stable molecule?
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N2H6
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Which of the molecules best obeys the octet rule?
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PCl3
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How many of the molecules have no dipole moment?
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NO2
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Which of these molecules shows resonance?
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NO2, O3
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