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What is the frequency of light (in Hz) of a photon emitted when an electron in a hydrogen atom undergoes a transition from the n = 5 energy state to the n = 2 energy state? Express your answer to at least two significant figures.
Hydrochloric acid is added to zinc. How many mls of 0.500 M HCl are needed to react completely with 25.0 g of zinc metal
If a non-cyclic alkane shows a molecular ion peak at m/z 2.4*10^2, what is the chemical formula
finds the antilog ratio of acid and base and determines that for every 1ml of acid she needs 2.29 ml of acid. what is the final concentration in molarity of the sodium acetate and the acetic acid?
Check your gas chromatogrm for the presence of compounds other than isopentyl acetate. Explain the presence of any additional
If 24.88 mL of a 0.01229 M EDTA solution is required to titrate the Ca2+ and Mg2+ in a 30.00mL water sample. Explain what is the water hardness level in ppm. Explain the molecular weight of CaCO3 is 100.1 g/mole
The pH difference diagonally the membrane of a glass electrode is 5.49. Explain how much voltage is generated by the pH gradient at: 25°C and 37°C
Write the balanced equation for the yeast using glucose to produce energy, ethanol and carbon dioxide.
Calculate the radius of the metal atom. A hypothetical metal has a face-centered cubic unit cell with the edge length of 4.943 Å.
7. 0.500 g each of hydrogen, H2, and carbon monoxide, CO, are introduced into an evacuated 250. mL flask. What will be the total pressure (in atm) in the flask at 22ºC? How much of the pressure will be due to hydrogen
we can see that the amount of heat released is 1679.5 \rm kJ per mole of methane, or 1679.5 \rm kJ per four moles of fluorine. How much heat is released per mole of fluorine
The reaction of Zn and Cu2+ produces a brown solid product. Explain what the identity of this product is. Give a balanced equation that shows the formation of this brown product
Compare the rate at which pH changes when HCl is added to the buffer solution the the rate of change when no buffer or base is present (distilled water).
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