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Explain the open structures, geometries and bond angles of water, ammonia and methane molecules using VSEPR rules. (Atomic numbers N: 7, O: 8, C: 6, H: 1)
A phase diagram would be useful in determining- 1. melting point 2. boiling point 3. triple point 4. vapor pressure 5. all of these
What scientific principle or law is used in the process of balancing chemical equations. Define the terms limiting reactant and excess reactant.
.375 kg of water are in a well insulated container at 21.3 degrees celsius. After 4.184 kJ of heat is added to the water, what is the final water temperature
The pKb values for the dibasic base B are pKb1 = 2.1 and pKb2 = 7.8. Calculate the pH at each of the following points in the titration of 50.0 mL of a 0.60 M B(aq) with 0.60 M HCl(aq).
When 85.00 mL of 0.250 M Ca(OH)2 (aq) and 15.00 mL of 0.750 M Pb(NO3) (aq) are mixed together in a beaker a yellow precipitate is formed. Assume all heavy metal hydroxides are insoluable
What mass of isopropyl alcohol (C3H8O) in grams can be melted when a sample absorbs 1575 kJ of heat at its melting point? (Isopropyl alcohol: ?Hfus = 5.37 kJ/mol)
A solution of 1.00 g of anhydrous aluminum chloride AlCl3, in 50.0 g of water is found to have a freezing point of -1.11 degrees Celsius. Explain. Kf (H20) = 1.86 degrees Celsius/m.
A solution contains 0.021 M Cl? and 0.017 M I?. A solution containing copper (I) ions is added to selectively precipitate one of the ions. At what concentration of copper (I) ion will a precipitate begin to form
The emission of NO2 by fossil fuel combustion can be prevented by injecting gaseous urea into the combustion mixture. The urea reduces NO (which oxidizes in air to form NO2) according to this reaction:
Should the leadership behaviors of the project manager change as the project evolves from the start to the later life-cycle stages?
A particular sports drink contains about 300 ppm sodium by mass. How many milligrams of sodium would be in an 8 oz. bottle of this beverage. Assume the density of the sport drink is 1.14 g/ml.
The water level in a graduated cylinder initially at 221 rises to 271 after a piece of lead is submerged. What is the mass in grams of the lead?
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