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Consider the reaction with the rate law, Rate = k[BrO3-][Br-][H+]2. By what factor does the rate change if the concentration of BrO3- is tripled and that of Br- is is decreased by a factor of 3? Jus
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.
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?
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?
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?
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.
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 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
The metal brass is really a solution of what two elements?
Describe a procedure for measuring the density of a liquid such a t-butanol. Your only available tools are a graduated cylinder and a top loading balance.
Based on their activation energies and energy changes and assuming that all collision factors are the same, which of the following reactions would be fastest and which would be slowest?
If the average kinetic energy of NH3 is 7.1x10^-21 J/molecules at 70 degrees celcius, calculate the root-mean-square speed of Ne atomes in m/s.
The activation energy of a certain reaction is 44.5kJ/mol. At 21, the rate constant is0.0110 s^-1 . At what temperature in degrees Celsius would this reaction go twice as fast?