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Cubane C8 H8 (s) is a cubic-shaped hydrocarbon with a carbon atom at each corner of the cube. Cubane is very unstable. Some researchers have been seriously injured when the crystals of the compound exploded while being scoped out of a bottle. Not surprisingly, cubane has been the subject of some research as an explosive.
a. According to the VSPER theory, what should be the shape around each carbon atom? What shape is associated with this bond angle?
An X-ray photon of wavelength 0.976 strikes a surface. The emitted electron has a kinetic energy of 958 eV. What is the binding energy of the electron in?
Explain why this is noise. Finally, explain something you could do to minimize the effect of this noise on your signal.
Problem- A 4.82g sample of iron is heated to 84.3 degrees Celsius. A 1.25g sample of gold is heated to 95.1 degrees Celsius. Both of these metals are added to 9.47g of cold water that is initially at 14.5 degrees Celsius.
Calculate change in internal energy. In the answer delta n is 6-7.5, and I don't quiet understand where these two numbers came from.
In the following buffer system, what happens to the concentration of the highlighted molecule if you add base in the form of OH-. HF + NaF + H2O F- + H3O+ + Na+
What is the molar mass of the unknown gas. Elemental analysis of the unknown gas from Part A revealed that it is 30.45% N and 69.55% O. What is the molecular formula for this gas.
A student following the procedure in this experiment prepared three solutions by adding 11.50, 23.00, and 34.50 mL of a 7.60 x 10-2M NaOH solution to 50.00 mL of a .112M solution of a weak acide. The solutions were labeled 1, 2, and 3 respectively
Which condition characterizes the stoichiometric point of any acid/base titration? a) equivalent molar amounts of acid and base have reacted. b) The pH is exactly 7.0 c) The indicator changes from pink to colorless
A mammoth skeleton has a carbon-14 decay rate of 0.46 disintegratioins per minute per gram of carbon (0.46 dis/min*g C)
a mass of 48.5 g of a certain substanse can be disolved in 29.1 cm3 of water at 20 degrees celcius. calculate the
How many grams of are CaH2 needed to generate 147L of H2 gas if the pressure of H2 is 827 torr at 20 C?
How many mL of 0.50 M sodium acetate must be added to 20mL of 0.20 M acetic acid to yield a buffer of PH 4.20?
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