Which two of the following are isotopes of the same element: ; ; ? What is the identity of the element whose isotopes you have selected? Answer: The isotopes are and and the element is sulfur, S Each of the following isotopes is used in medicine. Indicate the number of protons and neutrons in each isotope: Phosphorus-32 Technetium -99 Chromium-51 Iodine-131 Cobalt-60 Thallium-201 Answer: Isotope # of proton # of neutron Phosphorus-32 15 32-15 = 17 Chromium-51 24 51-24 = 27 Cobalt-60 27 60-27 = 33 Technetium -99 43 99-43 = 56 Iodine-131 53 131-53 = 78 Thallium-201 81 201-81 = 120 Predict the chemical formula for the compound formed by Ca2+ and Br– NH4+ and SO42– K+ and CO32– Mg2+ and PO43– Al3+ and CH3COO– Answer: a) CaBr2 b) K2CO3 c) Al(CH3COO)3 d) (NH4)2SO4 e) Mg3(PO4)2 Predict whether each of the following compound is molecular or ionic: B2H6 Sc2O3 NF3 CsBr Ag2SO4 LiNO3 NOCl Answer: Molecular Ionic Molecular Molecular Ionic Ionic Ionic Molecular Name the following compounds: K2O Fe2(CO3)3 KMnO4 NaClO2 Cr(NO3)3 Ag2Cr2O7 Sr(CN)2 (NH4)2SO3 Co(OH)2 NaH2PO4 Answer: Potassium oxide Ammonium sulfite Sodium chlorite Sodium dihydrogen phosphate Strontium cyanide Potassium permanganate or Cobalt(II) hydroxide potassium manganate(VII) Iron(III) carbonate Silver dichromate Chromium(III) nitrate Solve the following using dimensional analysis:
Which two of the following are isotopes of the same element: ; ; ? What is the identity of the element whose isotopes you have selected? Answer: The isotopes are and and the element is sulfur, S Each of the following isotopes is used in medicine. Indicate the number of protons and neutrons in each isotope: Phosphorus-32 Chromium-51 Cobalt-60 Technetium -99 Iodine-131 Thallium-201 Answer: Isotope # of proton # of neutron Phosphorus-32 15 32-15 = 17 Chromium-51 24 51-24 = 27 Cobalt-60 27 60-27 = 33 Technetium -99 43 99-43 = 56 Iodine-131 53 131-53 = 78 Thallium-201 81 201-81 = 120 Predict the chemical formula for the compound formed by Ca2+ and Br– K+ and CO32– Al3+ and CH3COO– NH4+ and SO42– Mg2+ and PO43– Answer: a) CaBr2 b) K2CO3 c) Al(CH3COO)3 d) (NH4)2SO4 e) Mg3(PO4)2 Predict whether each of the following compound is molecular or ionic: B2H6 LiNO3 Sc2O3 CsBr NOCl NF3 Ag2SO4 Answer: Molecular Molecular Ionic Ionic Ionic Molecular Molecular Ionic Name the following compounds: K2O NaClO2 Sr(CN)2 Co(OH)2 Fe2(CO3)3 Cr(NO3)3 (NH4)2SO3 NaH2PO4 KMnO4 Ag2Cr2O7 Answer: Potassium oxide Sodium chlorite Strontium cyanide Cobalt(II) hydroxide Iron(III) carbonate Chromium(III) nitrate Ammonium sulfite Sodium dihydrogen phosphate Potassium permanganate or potassium manganate(VII) Silver dichromate Solve the following using dimensional analysis:
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