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A student is examining a bacterium under the microscope. The E. coli bacterial cell has a mass of = 1.20 (where a femtogram, fg is 10^-15 and is swimming at a velocity of = 5.00 , with an uncertainty in the velocity of 4.00 %. E. coli bacterial cells are around 1 (mu)m ( 10^-6 m) in length. The student is supposed to observe the bacterium and make a drawing. However, the student, having just learned about the Heisenberg uncertainty principle in physics class, complains that she cannot make the drawing. She claims that the uncertainty of the bacterium's position is greater than the microscope's viewing field, and the bacterium is thus impossible to locate. What is the uncertainty of the position of the bacterium?
Sucrose, C12H22O11, is a nonelectrolyte; hypochlorous acid, HClO, is a weak electrolyte; and ammonium chloride, NH4Cl, is a strong electrolyte.
A cell has a standard emf of +0.116 V at 298K. What is the value of the equilibrium constant for the cell reaction if n=1, n=2, and n=3
An experiment requires 46.0 of ethylene glycol, a liquid whose density is 1.114 . Rather than weigh the sample on a balance, a chemist chooses to dispense the liquid using a graduated cylinder.
What is the theoretical yield of hydrazine, in grams, prepared from the reaction of 125.0 mL of 0.500M NH3(aq) with 25.0mL of 1.70M NaOCl (aq)?
The flask was removed, was quickly cooled to condense the volatile liquid, dried and weighed. The mass of the flask and the volatile liquid is 34.743 grams
A 0.00100 mol sample of Ca(OH)2 requires 25.00 mL of aqueous HCl for neutralization according to the reaction below. What is the concentration of the HCl
Concentration of NADH was found by using beer's law using 6.22 mM cm-1 as extinction coefficient. Concentration of NADH = .0212 mM. Moles of NADH that are present in 1.02 mL sample was found by : .0212 mM x 1.02 mL = .021624 mM/mL
Solve for the new pressure in each of the following, with n and V constant: 1)A gas with a pressure of 1.25 atm at 90 Celsiusis cooled to -17 Celsius. 2)A sample of N2 with a pressure of 790 mm Hg at -75 Celsius is heated to 34 Celsius
The four molecular p orbitals of the four carbon atoms can be lined up parallel in order to create four new molecular orbitals. The electrons in the new molecular orbitals benefit because they are not confined to just one atom.
(1.) Determine the pH of this buffer. (2.) Some solid sodium hydroxide is added to this buffer system and the new pH is measured as 4.74. How many grams of NaOH were added? (Assume the total volume remains unchanged)
The blood buffer system is made up of H2CO3 and HCO3. Describe with the use of equations how this system responds to added H3O and to added OH.
(a) If the fuel consists of 9.3 mole CH4, 3.1 mole C2H6, 0.40 mol C3H8, and 0.20 mole C4H10, what mass of CO2 (g) is produced per minute? (b) How much heat is released per minute?
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