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Solid CO2 (dry ice) forms a molecular crystal that sublimes at -78oC. SiO2 forms a network solid that melts at about 1200oC. Which of the following accounts for this striking difference in properties?
Unlike C, Si does not normally exist in the +4 oxidation state.Si is more electronegative than C.Si is a stronger Lewis base than C.Unlike C, Si uses d-orbitals in bonding.Unlike C, Si cannot make multiple bonds.
A 800 mL sample of a saturated aqueous solution of calcium oxalate, CaC2O4, at 95 degrees C is cooled to 13 degrees C. How many milligrams if calcium oxalate will precipitate?
A piece of metal of mass 18 g at 117 C is placed in a calorimeter containing 48.2 g ofwater at 21C. The final temperature of the mixture is 85.4C.
121 cal of heat are added to 50.0 g of water initially at 15.0 (degrees celsius). What is the final temperature of the water.
Strong, non-charged bases are useful in base-catalyzed reactions. Many non-charged nitrogen bases are commonly used in various reactions. Perhaps the strongest non-charged base is shown below
What is the minimum uncertainty in the position of an electron, given that we know nothing about its speed except that it is less than the speed of light?
What mass of oxygen will be dissolved in the water? The temperature of the water is 58 C, KH (02)=.00141 M/atm, and the mole fraction of oxygen gas in .23
Explain why the bond dissociation energy for the C-C sigma bond in propane is lower than the BDE for the C-C bond in propene.
The Ksp of barium fluoride is 1.0 x 10^-6. The Ksp of calcium fluoride is 3.9 x 10^-11. What is the remaining concentration of the first ion to precipitate when the second ion begins to precipitate?
State the chemical reaction that took place in the patient's body.
The osmotic pressure,pie , of a solution of glucose is 83.1atm . Find the molarity of the solution at 298k .
An asteroid fragment contains carbon, it may burn when entering the Earth's atmosphere. What is the most likely compound to result from this process
A farmer applies 1400.0 kg of a fertilizer that contains 10.0% nitrogen to his fields each year. 15.0% of the fertilizer washes into a river that flows through the farm.
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