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On a workday the average decibel level of a busy street is 84 dB, with 100 cars passing a given point every minute. what is the decibel level of the street
what is the maximum mass of sucralose (C12H19Cl3O8) you can add to 3.0 kg of pure water and still have the solution freeze? Assume that sucralose is a molecular solid and does not ionize when it dis
A 0.5872-gram sample of potassium hydrogen phthalate (KHC8H4O4) is dissolved in 50.0 mL of solution. What is the molarity of this solution
How do I find pressure exerted in the closed end of an apparatus if the atmospheric pressure is 720.0 torr and the height of the water column is 22.3 cm
A low speed wind tunnel has an inlet cross sectional area of 2m2 and a test cross sectional area of 0.5m2. What is the inlet velocity
A hypodermic syringe contains a medicine with the density of water, Determine the medicine's flow speed through the needle
CO2 properties: appearance, reaction with limewater, reaction with flame, behavior with water. If positive observation then write a balanced equation.
A 28.9-g bullet is fired from a rifle. It takes 3.86 × 10-3 s for the bullet to travel the length of the barrel, find the average net force exerted on the bullet
A buffer was prepared by dissolving .200 mol of the weak acid Ha (ka 1.00x10^-5) plus .050 mol of its conjugate base Na+A- in 1.00L find the pH
Water moves through a constricted pipe in steady, ideal flow. At the lower point the pressure is 1.75 105 Pa and the pipe radius is 2.60 cm, Find the speed of flow in the lower section
Find the pH and the concentration of each of the species of lysine in a solution of .010M lysine monohydrochloride (lysine-HCl)
When a 21.0-V emf device is placed across two resistors in series, a current of 12.0 A is flowing in each of the resistors. determine the magnitude of the larger of the two resistance
Define buffer capacity and explain why the buffer capacity reaches a maximum when pH=pKa
A lamp (R = 155 ), an electric heater (R = 27 ), and a fan (R = 51 ) are connected in parallel across a 118 V line. What power is expended in the heater
A solution is made by mixing 40.0 mL of ethanol, C2H6O, and 60.0 mL of water. Assuming ideal behavior, what is the vapor pressure of the solution at 20 °C
What is an ecosystem and how does it differ from a biome and what are the three major functional groups of organisms, and how do they perform in an ecosystem?
The total (inner + outer) chloride content of a second sample, weighing 0.2222 g, are titrated with 40.00mL of 0.1000M \(AgNO_{3}\) What is the ratio of moles of total chloride to mass of complex
An athlete executing a long jump leaves the ground at a 34.8 degrees angle and travels 7.86m. how much longer would the jump be
A 24.0 g copper ring at 0.000°C has an inner diameter of D = 2.54000 cm. An aluminum sphere at 103.0°C has a diameter of d = 2.54508 cm. What is the mass of the sphere
A compound containing nitrogen and oxygen is decomposed in the laboratory and produces 1.78 of nitrogen and 4.05 of oxygen emperical formula
A certain reaction has an activation energy of 63.62 kJ/mol. At what Kelvin temperature will the reaction proceed 4.50 times faster than it did at 347 K
TLC plate that is then developedi n a 1:1 hexane/ethyl acetate solution the solvent front is measured at 6.5 cm and the distance traveled by caffeine is measured at 2.15 cm. What can be determined a
A solution is 0.40 mol % (C6H6) in carbon tetrachloride (CCl4) at 20 degree celcius. the vapor pressure of pure benzene at this temperature is 74.61 mmHg and the vapor pressure of pure carbon tetrac
A basketball leaves a player's hands at a height of 2.20m above the floor. what is the range of initial speeds allowed to make the basket
In a titration of 38.16 mL of 0.1234 M hydrazoic acid (HN3, Ka = 1.900x10-5) with 0.08559 M KOH, what is the pH after 87.78 mLs of titrant have been added