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What causes the colors of fireworks. Where do the colors come from? How do we get so many different colors. Give at least onr example of a compound responsible for such characteristic color.
A particle contains the quark combination: u b, What is the charge of the particle and What is the baryon number of the particle
a student found that 0.0025 moles of NaOH was used in titration. how many moles of fatty acids where in the sample
At equilibrium 4.41e-02 mol of HCl is found in the reaction mixture. Calculate the equilibrium pressures of all gases in the reaction vessel and the value of KP for the reaction. Pick the correct st
For a hydrogen atom, an electron is in the second excited state, What wavelength of light will ionize the electon
For a solution having 1.00 x 10^-3 equivalents/L total alkalinity (contributions from HCO3-, CO32- and OH-) at [H+] = 4.69 x 10^-11, what is the percentage contribution to alkalinity from CO32-
A wheel with a radius of 0.25 m rolls without slipping on a level road at a constant speed of 1.1 m/s for 2.0 min
a) Subtract blank value (0.2 mV) from each measured signal. Make graph to find volume % of C2H2 in unknown b) Use method of least squares to find uncertainties in slope & intercept of your graph
A train has a speed of v = 66.5 km/h. If the acceleration experienced by the passengers is to be less than 0.35 g, find the smallest radius of curvature R acceptable for the track
The density of ocean water at a depth of 10,000 m is 1.071 g/mol and if 27 g of water at that depth contains 185 mg of potassium chloride, what is the molarity of potassium chloride in the sample
A pressure gauge on a welder's tank gives a reading of 22.4 psig.The barometer reading is 26.6 in. Hg. Calculate the absolute pressure in the tank in:
Pick and element or compound and state how many grams of that substance are needed to have a mole of that substance.
The activation energy of a certain reaction is 76.4 kJ/mol. How many times faster will the reaction occur at 42C than at 0C
A 1382-kg car is moving westward with a speed of 21.1 m/s, Find the velocity of the center of mass of the car-truck system
What is the density (in g/L) of a mixture of equal numbers of moles of N2 and CO2 gas in a 8.00 L container at 298K if the pressure exerted is 19.0 atm
Boron is to be converted into N-type by Phosphorous dopant, so that the resistivity at T = 100 C is 1.2 ohm-cm. all atom are fully ionized. calculate the doping density of Phosphorous and the resisti
In a Compton collision, if the wavelength of the photon is 1.00 pm and its deflected angle is 60.0°
A 0.221 g sample of sodium carbonate was titrated to a pale yellow endpoint with HCl. What is the concentration of HCl
A very light rigid rod of length 0.600 m extends straight out from one end of a metre long rod of mass M. Determine the period of oscillation of the system
The tripeptide alanyllysylaspartate contains four ionizable groups with pKas of 2.0, 3.9, 9.9, and 10.5. Calculate the pI for this molecule.
A heat engine extracts 50.0kJ of heat from the hot reservoir each cycle and exhausts 35.0kJ of heat. What is the thermal efficiency
what is the molecular formula for a substance that contains in 1.00 mole of sample 1.00 mole of S, 24.1 x 10^23 atoms of F, and 71.0 grams of Cl
A lens for a 35-mm camera has a focal length given by f = 40mm. What is the magnification of the image on the film
A piece of aluminum foil 1.00cm square and 0.550mm thick is allowed to react with bromine to form aluminum bromide.
A typical wall outlet voltage is 120 volts in the United States. calculate the number of turns on the secondary coil of the adapter transformer