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Which choice correctly describes the electron pairs in the valence shell of the central atom in a molecule of Cl2O?
a. 4 bonding pairs and 0 non bonding pairs
b. 3 bonding pairs and 1 non bonding pair
c. 2 bonding pairs and 2 non bonding pairs
d. 1 bonding pair and 3 non bonding pairs
e. 0 bonding pairs and 4 non bonding pairs
A carboxylic acid favours the ion form (R-COO-) and its pH is higher than its pKa. In most membranes, the polar heads of the phospholipids align towards the middle of the membrane.
Calculate the energy released when a 28.9 gram piece of copper is cooled from its melting point of 1083 degrees C to 25.0 degrees C. The specific heat of copper is .385 J/g degrees C.
Methane diffuses approximately 2.43 times as fast as an unknown gas. Which of the following could be and unknown gas?
Dissolving 3.00 g of an impure sample of CaCO3 in an excess of HCl acid produced .656 L of CO2 (measured at 20 degrees C and 792 mmHg). calculate the percent by mass of calcium carbonate in the sample. State any assumptions.
Draw line-angle structural formulas for 8 constitutional isomers that have a molecular formula C4H8O.
sample melts before you were ready to read the temperature. Should you cool the capillary and start again or prepare a fresh sample? Explain.
Calculate the vapor pressure of water above a solution prepared by adding 23.5 g of lactose (C12H22O11)to 200.0g of water at 338K . (Vapor-pressure of water at 338K 187.5 torr.)
in the electrolysis of a sodium chloride solution, what volume of H2 is produced in the same time it takes to produce 257L of Cl2, with both volumes measured at 50 celcius degrees and 2.50atm
A student is asked to determine the formula of a hydrate of colbalt (II) chloride. The mass of the empty clean, dry crucible and cover, after heating is 22.446 g. A sample of 0.324 g of cobalt chloride is added to the crucible.
When 25.0 mL of 0.400 M H2SO4 and 50.0 mL of 0.850 M H2SO4 are mixed, what is the molarity of sulfuric acid in the final solution?
Calculate the partial pressure of each gas and the total pressure if the temperature of the gas is 21 degrees Celcius.
solution of 116 mL of .180 m of KOH is mixed with 290 mL of .190 m NiSO4. What are the concentrations of Ni, SO4 and K that remain
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