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The first ionization energies of the elements ______ as you go from left to right across a period of the periodic table, and ______ as you go from the bottom to the top of a group in the table.
A.) increase, decreaseB.) decrease, increaseC.) decrease, decreaseD.) unpredictable, unpredictableE.) increase, increase
Determine the amount of heat produced when 100 g of CH4 combust, CH4 + 2O2 yields CO2 + 2H2O + 1063kJ
a urine sample contains 46.5mgl-1 of ethanol. the density of ethanol is 0.79gcm-3. what is the concentration expressed
Calculate the pH of a solution that results from mixing 32.8 mL of 0.157 M dimethylamine ((CH3)2NH) with 44.0 mL of 0.144 M (CH3)2NH2Cl. The Kb value for (CH3)2NH is 5.4 x 10-4
A sample of H½O with a mass of 46.0 grams has a temperature of -58.0 àC. How many joules of energy are necessary to heat the steam from 100.0 àC to 114.0 àC if the specific heat of steam is 2.01 J/g àC?
If 2 volumes of 0.1 M monobasic potassium phosphate, KH2PO4, are mixed with 1 volume of 0.1 M dibasic sodium phosphate, Na2HPO4, what will be the pH of the mixture?
Draw the amine from the following: A Hofmann degradation of a primary amine forms an alkene that gives butanal
Copper metal and zinc metal react differently in the presence of certain acids. For example, while both react with concentrated nitric acid and dissolve completely, only zinc reacts and dissolves in dilute hydrochloric acid.
The kinetic energy of the emitted electrons is measured to be 11.7 eV. What is the first ionization energy of Hg in kJ/mol? kJ/mol (d) Using this figure of ionization energies, determine which of the halogen elements has a first ionization energy ..
Suppose the reaction is at equilibrium 2NOBr (g) 2NO(g)+Br2(g) Delta Hf NOBr=82.2 Kj/mol DeltaHf NO=90.4 KJ/mol What happens to Kp when the temperature is increased
increased the space between the energy levels keeping the temperature fixed or (ii) increased the temperature and keeping the energy levels fixed.
calculate the volume of carbon dioxide, measured at 273 k and 1.01 x 10 5 Pa, which would be produced when 1.25 g of calcium carbonate reacts completely with the hydrochloric acid.
A hydrogen atom with an electron in its ground state interacts with a photon of light with a wavelength of 1.22 × 10-6m. Could the electron make a transition from the ground state to a higher energy level?
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