Which answer represents the correct chemical formulas for ammonium oxalate, calcium acetate,and magnesium sulfate heptahydrate. A. (NH4)2C2O4, Ca(CH3COO)2, MgSO4·6H2O B. NH4C2O4, Ca(CH3COO)2, MgSO3·6H2O C. (NH4)2C2O4, Ca(CH3COO)2, MgSO4·7H2O D. (NH4)2C2O4, CaCH3COO, MgSO4·6H2O E. NH4C2O4, CaCH3COO, MgSO4·7H2O   B) Cork has a density of about 0.60 g/cm3. Cork will partially float in water which has a densityof 1.0 g/cm3. If the piece of cork has a total volume of 5.0 cm3what volume of cork is BELOW thewater? A. 1.0 cm3 B. 1.5 cm3 C. 2.0 cm3 D. 2.5 cm3 E. 3.0 cm3   C) Let an n-protic acid be an acid that can donate n hydrogen ions and has the formula HnX. If 0.600 L of 0.400 M sodium hydroxide is required to titrate 0.400 L of a 0.300 M HnX to theequivalence point, what is n in HnX? A. 1 B. 2 C. 3 D. 4 E. 5

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Crystal Structures

Solids are present all around us. They have different properties and applications. Diamond and graphite are two well-known solids. Diamond is the hardest material in the world and is used in making jewelry. Graphite on the other hand is soft. The lead of your pencil is graphite. Why are they so different in appearance and properties despite the fact they are chemically the same? Both are allotropes of carbon. The answer lies in the structure, the way constituent particles are arranged in the solids.