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FireFlies flash at a rate that depends on temperature. At 29 C the average rate is 3.3 flashes every 10 seconds;at 23 C the average rate falls to 2.7 flashes every 10 seconds.Calculate the activation energy for flashing process.
How many grams of KO2 are needed to react completely with 7.328 g of CO2.
placed in 1.00*10^3 g of water at 25C. final temp of this mixture was 26.3C. What is specific heat of metal?
How many grams of silver and how many grams of chloride ions are in 1 L of solution?
Calculate the molar heat of neutralization (in kJ mol-1). The heat capacity of the calorimeter is 10 cal/g·0C.
Find the velocity of an electron emitted by a metal whose threshold frequency is 2.15×1014 {rm s^{-1}} when it is exposed to visible light of wavelength 4.76×10-7 {rm m}.
Assuming the solution has a heat capacity of 4.18 J/°C·g and assuming no heat loss to the calorimeter, calculate the enthalpy change for the dissolution of NH4NO3 in units of kJ/mol.
A 36.3 mL aliquot of 0.0529 M H2SO4 (aq) is to be titrated with 0.0411 M NaOH (aq). What volume (mL) of base will it take to reach the equivalence point?
In the Virtual ChemLab experiment "Electronic State Energy Levels," what gaseous element is used in fluorescent light tubes?
Calculate the mass of pure silver that when heated from 12.0 degrees celcius to 15.2 degrees celcius it required 1.25 kj of energy
A student used 40.5mL of 0.48M sodium carbonate solution and 45.6mL of the hydrochloric acid solution. The substance in the beaker at the end of the experiment had a mass of 0.93g. Calculate the concentration of the hydrochloric acid solution.
Calculate the voltage difference between two points of corroding iron differing only in their partial pressure of oxygen
Its undissociated form is red and its anionic form is yellow. What color would a methyl red solution have at pH = 7.0 ? Show your calculations. Hint: Determine the concentration ratio of methyl red and its conjugate.
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