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Which compound requires a higher energy photon to cause a p to p* (HOMO/LUMO) transition, 1,30butadiene or 1,3,5-hexatriene?
what is the concentration in the solution of the first ion when the second one starts to precipitate at 25 C?
For the following elements show the allocation of electrons to their orbitals on the basis of the Pauli exclusion principle, Hund's rule, and the Aufbau principle.
the active ingredient in toothpaste is sodium fluoride, an anticavity agent. a 170 g tube of toothpaste lists the concentration of sodium fluoride a s0.24%. how many grams of sodium fluoride are in a toothpaste.
The specific heat of the product is 4.06J/g deg. C and the density is 1.01g/mL. a. Calculate the heat of the reaction, q, and the enthalpy per mole.
A 500.0 g sample of aluminium is initially at 25.0 °C. It absorbs 32.60 kJ of heat from its surroundings. What is its final temperature, in °C? (specific heat = 0.9930 J g-1 K-1 for aluminum)
A copper wire (density = 8.96 g/cm3) has a diameter of 0.27 mm. If a sample of this copper wire has a mass of 35 g, how long is the wire?
Benzene has a heat of vaporization of 30.72 kJ/mol and a normal boiling point of 80.1 degrees C. At what temperature does benzene boil when the external pressure is 490?
If the total volume of the jewelry is the sum of the volumes of the gold and silver that it contains, calculate the percentage of gold (by mass) in the jewelry.
What is the de Broglie wavelength of a flea midway through its jump? Assume the mass of the flea is4.50×10-4 g and t is moving at 1.00 m/s.
A beaker with 185 mL of an acetic acid buffer with a pH of 5.00 is sitting on a benchtop. The total molarity of acid and conjugate base in this buffer is 0.100 M. A student adds 6.70 mL of a 0.440 M HCl solution to the beaker.
Imagine that you have a 7.00 gas tank and a 4.50 gas tank. You need to fill one tank with oxygen and the other with acetylene to use in conjunction with your welding torch.
How long would it take for a radioactive isotope with a half life of 2 weeks to lose at least 70% of its radioactivity? Describe two clinical uses of Radioactivity.
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