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How many years will it take for a sample of 25 microcuries of tritium to decay to 3.125 microcuries?
If the final temperature is 23.5 deg C, what was the unknown volume? (no heat was lost to the surroundings, d of water is 1 g/mL)
Calculate the pH of a solution that is 0.20 M HOCl and 0.90 M KOCl. In order for this buffer to have pH=pKa, would you add HCl or NaOH?
An individual's blood alcohol content (% alcohol in blood as measured mass per volume = mass of alcohol per volume of blood) was 0.15. If we assume the individual drank all of the alcohol at once
Carbon emits photons at 745 nm when exposed to blackbody radiation. How much energy would be obtained if 44 g of carbon were irradiated?
Draw a rough sketch of the energy profile for each of the following cases. a. E = +10 kJ/mol, Ea = 25 kJ/mol b. E = -10 kJ/mol, Ea = 50 kJ/mol c.
Suggest mathematical functions that represent a sinusoidal wave of amplitude A, frequency v, and wavelength
the 23rd-century starship enterprise uses a substance called di-lithium crystals as its fuel. the mass of one 6li atom
Draw 2 resonance structures for each of the following molecules. Calculate the formal charge for each atom and indicate whether the structures are equivalent. Benzene, C6H6
Why silicon tetrachloride reacts with water to produce SiO2 but carbon tetrachloride does not react with water? 1. SiCl4 can act as a Lewis base
A 3.00 L helium balloon, initially at STP, floats up to an altitude of 10 km, where the pressure is 200.0 torr and the temperature is -45°C. What is the balloon's new volume?
An aluminum foil package contains 75 square feet of foil that weighs 12 ounces. Aluminum has a density of 2.70 g/cm^3. What is the approx thickness of the foil in mm
Using the "unit conversion method", derive an equation to calculate the heat produced from the HCl-NaOH reaction, and write your equation on Sample Calculations A
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