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Construct the Lewis structure for the covalent compound silicon dioxide (SiO2) using the following steps.
1) The total number of valence electrons in SiO2 is ____.
2) Arranging the atomic cores appropriately, write the Lewis structure for SiO2 in the box. Use electron pairs to show the bonds between the atoms. Distribute the remaining electrons so that each atom has an octet.
3) If you have trouble placing all of the electrons, consider the possibility of using one or more double bonds in the structure. How many, if any, double bonds are required?_____
An athlete takes human growth hormone (HGH) that enhances his ability to have the best time of any Olympic marathon runner in history.
Phosphoric acid is a weak triprotic acid with the formula H3PO4. If you have 50.0 mL of a 1.0 M solution of H3PO4, how many grams of NaOH (MM = 40.0g/mol) should you add to make a buffer with a pH of 7.00?
A piston-cylinder device contains a saturated mixture of steam and water having a total mass of 0.5 kg at a pressure of 160 kPa and an initial volume of 100 liters
If the final concentration of CN- is 0.5 M at equilibrium, what is the equilibrium concentration of uncomplexed Fe3+ ions The Kr of Fe(CN)6 3- is 1.0 x 10^42
Calculate the concentration of silver necessary to begin precipitation of AgCl from a solution in which the Cl concentration is 7.4e-4 M.
macroscopic model describing what happens when solutions of salt (NaCl) and sugar (c12h22011) are prepared to measure their conductivity. Describe what you would observe before and after you added salt and sugar to water
The solution to physical chemistry, A laser used to read CDs emits red light of wavelength 700 nm. How many photons does the laser emit per second
Calculate the pH of a 0.40 M H2SO3, solution that has the stepwise dissociation constants Ka1 = 1.5 × 10-2 and Ka2 = 6.3 × 10-8.
The molar volume of the liquid at this temperature and pressure is 163.3 cm^3/mol. At 100 atm the melting temp changes to 351.26 K. Calculate the enthalpy and entropy of fusion of the solid.
What mass (in grams)of KNO3 would have to be decomposed to produce 27.1 L of oxygen measured at STP?
Fluorine 18, which has a half live of 110 min, is used in PET scans. If 100 mg of fluorine 18 is shipped at 8am, how many mg of the radioisotope are still active if the sample arrives at 130 pm
When 50 mL of water contains 0.50 moles HCl at 22.5 degrees celsius is added to 50.0mL of water containing 0.50 mol NaOH at 22.5 degrees celsius in a calorimeter, the temperature of the solution increases to 26.0 degrees celsius.
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