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In 1897, English physicist J.J. Thomson "discovered" the electron with a very elegant and relatively simple experiment. Consider shooting a beam of electrons at a constant speed through a region of uniform electric and magnetic fields and , respectively. The directions of , and are all perpendicular to one another.
a) What direction(s) should the two fields point in so that the two forces on the electrons (magnetic and electric) counteract one another? b) Imagine the scenario in which the and fields have been tuned so that the net force on the electrons is zero. What is the speed of the electrons? c) If you now turn off the electric field, what happens to the particles? What is the charge-to-mass ratio (/) of an electron (in terms of the above variables)?
What would happen to the % Transmittance value if the wavelegth is changed from 447nm to 520 nm
determine the expression for the rate of the reation in terms of the change in concetration of each of the reatants and products.
A 270- flask contains pure helium at a pressure of 755 . A second flask with a volume of 485 contains pure argon at a pressure of 727 torr.
The solubility of O2 (g), in water at 25°C is 3.16 mL/100 g H2O when the gas pressure is maintained at 1 atm. What pressure of O2 (g) would be required to produce a saturated solution containing 10.9 mL/100 g H2O?
If 45 mL of H2 (g) are collected over water at 27°C and 751 mmHg external pressure. How many grams of Al were reacted.
The vapour pressure of a substance at 20.0 oC is 49.3 kPa and its enthalpy of vaporisation is 40.6 kJ mol-1. Estimate the temperature at which its vapour pressure is 80.0 kPa
Propose a synthetic method to carry out the transformation shown, using any additional organic or inorganic reagents. 5 methyl 1 hexyne ----> 7 methyl 3 octene
Rank the substituents shown below in order of Cahn-Ingold-Prelog priorities (1 = highest priority group, 4 = lowest priority group).
Cellular respiration and photosynthesis are complementary reactions. In this lab, you will review both processes and put the steps
Write a balanced equation for the double-replacement precipitation reaction described, using the smallest possible integer coefficients. [silver nitrate and cobalt(II) iodide]
The conductance of an aqueous solution of trans-[Co(en)2Cl2]Cl changes on standing overnight. Would you expect it to incease or decrease. Why
Radioactive Radon-222 gas (222Rn) occurs naturally as a product of uranium decay. The half-life of222Rn is 3.8 days. Suppose a flask originally contained1.0×1013atoms of222Rn. How many atoms of222Rn will remain after one month (30. days)?
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