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Which of these ionic solids would have the largest lattice energy?
When sodium is heated, a yellow spectral line whose energy is 3.37x10^19 J/photon is produced. What is the frequency and wavelength of this light?
Calculate the molarity of an NH3 solution made up of 37.5 g of NH3 in 70.0 g of water. The density of the solution is 0.982 g/mL
A 75.0 L steel tank at 20.0C contains acetylene gas (C2H2) at a pressure of 1.39 atm. Assuming ideal gas behavior, how many grams of acetylene are in the tank?
An auto mechanic spills 90. mL of 2.6 M H2SO4 solution from a rebuilt auto battery. How many milliliters of 2.5 M NaHCO3 must be poured on the spill to react completely with the sulfuric acid.
The radius of a aluminum atom is 143 pm. How many aluminum atoms would have to be laid side by side to span a distance of 4.82 mm?
A reaction has Horxn = -120. KJ/mol and a forward activation energy, Ea = 80. kJ/mol. What is the activation energy for the reverse reaction? Describe the reaction as endothermic or exothermic, and re
A 64g piece of ice at 0 degrees celsius is added to a sample of water at 7 degrees celsius. All of the ice melts and the temperature of the water decreases to 0 degrees celsius How many grams of wat
What is the lewis structure for xenon tetrabromide?
calculate the molarity of acetic acid in a vinegar sample knowing that 5.00 mL of vinegar requires 43.50mL of 0.105M NaoH to just reach the phenolphtalein endpoint in a tritration.
Calculate the mass of ice at -15°C that must be added to cool the water to 10°C after thermal equilibrium is achieved. To find the mass of water use the density of water = 1.0 g/mL.
What is the orientation of the hydroxyl group when the compound is in chloroform solution? What evidence supports this?
A student dissolves 1.50g of copper(II) nitrate in water. After adding aqueous sodium carbonate solution which contains 1.80g of sodium carbonate, the student obtains 0.875g of CuCO3 precipitate. W
The rate constants of some reactions double with every 10 degree rise in temperature. Assume that a reaction takes place at 305K and 315 K. What must the activation energy be for the rate constant
What is the first excited state (next highest energy state) of the molecule? Draw a diagram indicating which orbitals the electrons are in, and label the states with their quantum numbers.
Calculate the final temperature of the solution when the CaCl2 has dissolved assuming there is no heat lost to the surroundings, there is no change in the melting point of ice, ΔHfus = 6.02 kJ
Identify the incorrect names or formulas.
Assume that you have a small amount (< 3mg) of crystals that formed from a recrystallation with 1 mL of solvent. To isolate the crystals, the best technique would be to.
Their molecules or ions are in close contact and do not move. A change of state or phase transition is a change of a substance from one physical state to another.
What substance would best be used for a boiling chip and why: a pearl found in an oyster; a pebble from the beach; a piece of lava rock from a nearby volcano.
IR Wavelengths Ultraviolet radiation is of particular relevance to a study of the ozone layer. Why? What about UV radiation affects ozone? What role does oxygen play with regard to filtering sunlight?
The oil from the fingers is burned off. How does this technique error affect the reported percent water in the hydrated salt? Explain
If an analytical method has been developed and the retention time for a particular anabolic steroid has been determined, how might you use this method to determine the possibility of the use of anab
Explain why if benzoic acid were substituted for 2-methoxyphenylacetic acid in this experiment the enantiomeric ratio of the yeast reduction product could not be determined by 1 H NMR.