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1) Give the expected hybridization of the central atom in the following molecules
sulphur in SF6
oxygen in H2O
seleniurn SeO3
phosphorus in PBr5
tellurium in TeF4
2) if we trcat H2O as weak acid , and H2O+ as bronted acid, what would be the Equation for their ionization constants (Ka) ?
3) culculate the pH of the 0.25M NH3 \ 0.30M NH4CL buffer system. what is the pH after the addition of (i) 40ml of 0.15M NaOH and (ii) 30ml of 0.20M HCl to 60ml of thebuffer solution ?
4) circle the molecules with a dipole moment ?
NH3 , CO2 , CHCl3 , CH4 , SO2
5) calculate the percentage ionization of benzoic acid at the following concentration : assume the approximation for both cases to be correct : a) 0.20M b) .0.00020M
A 60.0 g sample of an alloy was heated to 96.0 °C and then dropped into a beaker containing 87.0 g of water at 24.1 °C. The temperature of the water rose to a final 27.63 °C.
what is the actual yeid of bromobutane with the area of 750 and a theriotical of 100%
In a beaker, I mix 50 ml of 3 M HCl with 100 ml distilled water. Both fluids are at 25 C initially. (Cp mix =. 0.985 cal/g-C) a. what is the final T.
What is a likely mechanism for the reaction below: (2Z)-7-methylocta-2,6-dienal using heat and a hydroxyl to form 6-methylhept
the particle , electron is in lowest possible enrgy state. what is the probability of finding electron between 0.2 nm to 0.35 nm from one side of the wall.?
Suppose that all 175 L of liquid nitrogen in a tank accidentally vaporized in lab that measured 10.00 m X 10.00 m X 2.50 m. What maximum fraction of the air in the room is displaced by the gaseous nitrogen?
A student adds 6.60 of a 0.380 solution to the beaker. How much will the pH change? The of acetic acid is 4.760.
The solubility of the ionic compound M2X3, having a molar mass of 205 g/mol, is 3.16 10-7 g/L. Calculate the Ksp of the compound.
Hydrogen is collected over water at .975 atm and 28 degrees Celsius. What is the partial pressure of H2?
If you have 400mL of .5 M NH3, how many moles of .47 M HCl must be added to the ammonia solution to reach the equivalence point.
He was surprised that most of the white solid melted sharply between 121 and 122 C but that a small amount remained unmelted even at temperatures above 200 C. Explain this behavior.
The isomerization of cyclopropane to form propene is a first-order reaction. At 760 K, 85% of a sample of cyclopropane changes to propene in 79.0 min. Determine the rate constant for this reaction at 760 K
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