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Why is necessary to make sure there are no zinc metal particles in the cuvette before measuring the absorbance?
How would you expect your results to change if you increased the volume of indigo carmine solution added (example: 20 mL instead of 8 mL), but kept the amount of zinc solid the same? Explain your answer.
Suppose that N2 gas may be described as van der waals gas. This gas (n=1.25 mol) is expanded isothermally and reversibly from a volume of 1 liter to 10 liters at 300K
(a) How fast is the rocket car going at the top of the ramp, just before it is launched into the air? (b) How fast is the rocket car going when it hits the
If the value of Kc for the reaction is 2.50, what are the equilibrium concentrations of the products if the reaction mixture was initially 0.500 M SO2, 0.500 M NO2, 0.00500 M SO3, and 0.00500 M NO
Use the rydberg equation to calculate the wavelength (in nm) of the photon emitted when an electron in a hydrogen atom undergoes a transition from n=4 to n=2.
The same apparatus is them filled with an unknown gas at 32.3 C to a pressure of 645 mm Hg. It takes 5 hours 34 minutes and 25 seconds for the pressure to fall to 207 mm Hg. Calculate the molar mass of the unknown gas.
Describe the type of bonding that your unknown has (covalent, polar covalent). Locate and show any dipoles in your compound
Ice cream mix containing 40% total solids is frozen so that half of the original water is made into ice (which is effectively pure water). If the mix contained 12% fat, 16% sugar, and 12% nonfat milk solids
A gaseous mixture of O2 and N2 contains 30.8 nitrogen by mass. What is the partial pressure of oxygen in the mixture if the total pressure is 805 mmHg ?
A titration is carried out to determine the concentration of the acid in an old bottle of aqueous HCl whose label has become unreadable.What is the HCl concentration if 32.1mL of 0.250M NaOH is required to titrate a 30.0mL sample of the acid
What is the atomic weight of Mn if the atomic weights for Ag and Br are 107.868 and 79.904 respectively
the system is not at equilibrium and will shift to the right to achieve an equilibrium state. not at equilibrium and will shift to the left to achieve an equilibrium state. at equilibrium. not at equilibrium and will remain in an unequilibrated sta..
Pu-239 (nuclear mass of 239.0006 amu) decays by alpha emission to U-235 (nuclear mass of 234.9934). Calculate how much energy is given off by the decay of 2.00 mg of Pu-239.
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