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The temperature difference between these points was divided into 50 units (called X), what would be the freezing and boiling points of water in X?
What is the reaction order of H+ for a reaction with the following rate law?
The first order reaction A ---> Products has a half life of 46.2 minutes at 25C and 2.6 minutes at 102 C. Calculate the activation energy for this reaction.
The pressure of a gas contained in a cylinder with a movable piston is 450 Pa (450 N/m2). The area of the piston is 0.2 m2. What is magnitude of the force exerted on the piston by the gas?
Calculate the mass of propylene glycol (C3H8O2) that must be added to 0.340 kg of water to reduce the vapor pressure by 2.87 torr at 40 Degrees Celcius ( PH2O at 40 Degrees Celcius = 55.3 torr).
A mole of photons is called an einstein. Calculate the radiant energy of an einstein if the photons have a wavelength of 608.7 nm.
Calculate the average power output per pulse of a laser that produces 3.0 J in a 1.0-ps pulse. If the laser operates at 480 nm how many photons are produced in a pulse?
Question: An AC Series circuit has 12.0 ohms resistance, 15 ohms inductive resistance and 10 ohms capacitance resistance. if effective rms (emf) of 120V is applied what is the Poiwer output?
When a 0.133 g sample was studied by combustion analysis, 0.239 g of CO2 and 0.0323 g of H2O formed. How many moles of each of the following were in the original sample?
A 43-kg girl is bouncing on a trampoline. During a certain interval after leaving the surface of the trampoline, her kinetic energy decreases to 230 J from 420 J. How high does she rise during this
Joe is making a 0.0053 Molar sulfuric acid (H2SO4) solution in the lab. How many grams of pure sulfuric acid is needed to be used if he is trying to make 250 mL total of solution?
A first order decomposition reaction has a half-life of 43.3yr. What is the rate constant of the reaction in yr-1? (give answer to 3 sig figs using E notation)?
A chemist puts hot water extract of caffeine in to an ice bath and some crystallizes. Is the remaining solution saturated unsaturated or supersaturated and why?
Why Metals easily lose their electrons, and nonmetals gain electrons?
Which of the following would be a reasonable unit for the rate constant of a first order reaction?
Question: The angular momentum of a spinning wheel is 230 kg · m2/s. After application of a constant braking torque for 2.1 s, it slows and has a new angular momentum of 119 kg · m2/s.
The gas from a certain volcano had the following composition in mole percent (that is, mole fraction multiplied by 100). What would be the partial pressure of each of these gases if the total pressure
The mass of the sphere in #2 is 456 g. Calculate the density of that sphere. Please show work.
What is the change in volume of the balloon as it ascends from 1.00 atm to a pressure of 220. torr?
Calculate (a) the work done when the gas expands isothermally against a constant external pressure of 200 Torr until its volume has increased by 3.6 dm3.
A 600-eV electron and a 300-eV electron trapped in a uniform magnetic field move in circular paths in a plane perpendicular to the magnetic field. What is the ratio of the radii of their orbits?
For each of the following positive ions use the concept that a chemical compound must have a net charge of zero to predict the formula of the simple compounds that the positive ions would form with
What is the approximate pressure decrease in going 35 m above the surface? Air at 20° C has density of 1.2 kg/m3.
What properties of matter only apply to solids? What properties of matter only apply to liquids and/or gasses? Any property that applies to all states of matter?
Unit cell problem of copper (Cu) is a face-centered cube that has an edge lenth of 3.62 A (note: 1A=1*10^-10 m). Determine the volume occupied by one mole of copper atoms, , in terms of mL/m