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1) What is the name for MgOH2? a) Magnesium oxide b) Magnesium oxygen dihydrogen c) Magnesium hydroxide d) Manganese oxide 2) Sodium and sulfate can bond with one another to form a specific compound. Write the chemical formula. a) NaS b) Na2SO4 c) NaSO4 d) Na(SO4)2 3) Cobalt (II) and phosphate can bond with one another to form a specific compound. Write the chemical formula for this compound. a) CoP b) CoPO4 c) Co3(PO4)4 d) Co3(PO4)2 e) Cu3(PO4)4 4) What will be the name of Na2SO4 if it is hydrated with water to a factor of ten?  a) Sodium sulfide decahydrogen b) Sodium sulfate decahydride c) Disodium monosulfur tetraoxygen decahydrogen d) Sodium sulfate hydride 5) Calculate the mass percent composition of oxygen in Co3(PO4)2*2(H2O) to three significant figures. a) 50.2% b) 30.6% c) 44.7% d) 52.5% 6) Calculate the mass percent composition of oxygen in Na2SO4*10(H2O) to three significant figures. a) 78.3% b) 56.7% c) 80.9% d) 67.8% 7) Calculate the molar mass of Co3(PO4)2*2(H2O). a) 569.99 g/mol b) 402.76 g/mol c) 235.98 g/mol d) 238.78 g/mol 8) If 620 mg of oxygen are in a container, how many moles of this element are present? a) .0897 mol b) .239 mol c) .0388 mol d) .789 mol 9) What will be the name of Co3(PO4)2 if it is hydrated with water to a factor of two?  a) Cobalt Phosphate dihydrogen b) Tricobalt Diphosphorus dooxygen dihydrogen c) Cobalt (II) phosphate dihydride d) Cobalt phosphate hydride 10) If 640 mg of calcium are in a container, how many moles are present? a) .0160 mol b) .0789 mol c) .0547 mol d) .0768 mol 11) What is the percent composition of chlorine in PbCl2? a) 12.87% b) 25.49% c) 13.46% d) 14.87% 12) What is the mass percentage of water in ZnSO4 X 7H2O? a) 43.86% b) 69.03% c) 78.87% d) 32.00% 13) Calculate the molar mass of Na2SO4. a) 133.86 g/mol b) 122.68 g/mol c) 138.92 g/mol d) 142.04 g/mol 14) What is the name for this compound?: NH4Cl a) Ammonium chloride b) Dinitrogen tetrahydrogen monochlorine c) Nitrogen hydrogen chloride d) Ammonia chloride 15) What is the name for this compound?: P2O5 a) Phosphorous oxide b) Phosphorous oxygen c) Diphosphorus oxalate d) Diphosphorus Pentoxide  16) What is the name for this compound?: Al2S3 a) Dialuminum trisulfur b) Aluminum sulfide c) Aluminum sulfate d) Aluminum sulfur 17) What is the name for this compound?: Al2(CO3)3? a) Dialuminum tricarbonate b) Aluminum carbon oxate c) Aluminum carbonate d) Aluminum carbide 18) How many single bonds can a carbon atom form? a) 1 b) 2 c) 3 d) 4 e) 5 f) 6 19) How many lone pairs are in a molecule of SF4? a) 1 b) 2 c) 3 d) 4 e) 5 f) 6 20) Why are triple bonds shorter than single bonds? a) They are much weaker and therefore shorter. b) They are polar, and all polar bonds are short. c) The shared electrons are pulled together tightly due to the strength of the bond. d) These bonds have certain metallic properties that cause them to become shorter.

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