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In parts of the midwestern United States, sirens sound when a severe storm that may produce a tornado is approaching. Mandy is walking at a speed of 1.47 m/s directly toward one siren and directly away from another siren when they both begin to sound with a frequency of 700 Hz. What beat frequency does Mandy hear? (Assume a temperature of 20° C.) Hz
An element has a mass of 207 and has 125 neutron in its nucleus. how many protons and electrons does it have and where are they located
copper solid metal and copper sulfate, and of course a salt bridge filled with KCl. What voltage would you expect from this cell at room temperature and 1M ZnSO4 solution but 0.01M CuSO4 solution
Calculate the number of grams of Mg(OH)2 that should dissolve in 100 mL of water.
A student is required to generate 90.0 mL of carbon dioxide at 750 mm Hg and 21C using potassium hydrogen carbonate and HCl. What is the mass of the potassium hydrogen carbonate needed?
rewrite the equation so heat of reaction (delta H) equals deltaHf for 4PCl3 (g) yields p4(s) + 6Cl2 (g) Values for delta HF in Kj/mol are:
Survival of Fish in Freezing Water, Fish produce glycerol to survive the freezing waters of the Arctic. Determine the degree to which the freezing point of blood and other biological fluids is lowered with the help of glycerol.
A sparingly soluble salt gets precipitated only when the product of concentration of its ions in the solution (Qsp) becomes greater than its solubility product. If the solubility of BaSO4 in water is 8 × 10-4 mol dm-3, calculate its solubility in ..
certain anesthetic contains nbspcho by 64.9 13.5 21.6 nbspby mass. determine the molecular formula of the compound at
Electromagnetic radiation with a wavelength of 425 nm appears as violet light to the human eye. The energy of one photon of this light is 4.68 × 10-19 J. Thus, a laser that emits 1.3 × 10-3 J of energy in a pulse of light at this wavelength produc..
How would the results for atomic weight have differed if the hot water was never brought to a boil?
calculate the minimum volume in litres of aqueous sodium hypochlorite solution 12.5 12.5g100ml that would be needed to
list the names and chemical formulas for two allotropes of oxygen, three allotropes of phosphorus, and four allotropes of carbon
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