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The mean velocities of HCl gas and NH3 gas at 25 degrees Celsius are 450m/s and 660m/s respectively. With these speeds in mind, briefly explain why so much time was required for the HCl and NH3 to meet in the glass tube
A 4.30 g nugget of pure gold absorbed 293 J of heat. The initial temperature was 29.0°C. What was the final temperature?
Calculate how many grams of Ni2+ are present in 3.36 moles of nickel(II) fluoride(NiF2) and also determine the number of moles of F- ion are present in 4.82 grams of nickel(II) fluoride.
Write symbol for bromine.What is the atomic number of it in periodic table?How many protons and electrons are there in the atom of bromine?Give the highhest possible and minimal oxidation number for bromine.Determine its molar mass.
A 20.0 mL sample of 0.150 M KOH is titrated with 0.125 M HClO4 solution. Calculate the pH after the following volumes of acid have been added.
A normal value for blood cholesterol is 200mg/dl of blood. If a normal adult has a total blood volume of 5 L, how much total cholesterol is present.
what is the molecular formula and empirical formula of NH2Cl, molar mass = 51.5 g/mol
If a chemist wishes to prepare a buffer that will be effective at a pH of 5.0 and 25C, which of the following would be the best choice for the acid component and WHY
The following ions contain the same number of electrons. Rank them in order of decreasing ionic radii.
identify organic compounds in medications. determine the structure of one active component and identify three functional groups on each molecule.
A spherical ball of lead has a diameter of 6.5 cm. What is the mass of the sphere if lead has a density
What are your actual experimental ratios? Give possible reasons for any observed variations from these ratios.
What is the hybridization of the nitrogen atom in sulfathiazole? Assuming that the sulfur atom is sp2-hybridized, how many -electrons are there in the sulfathiazole ring?
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