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An electron would not be able to transition from a higher energy shell to a lower energy shell when: A- the shape of the shell is non-spherical B- the atom is a heavy isotope C- the shell contains 2n2 electrons D- the shell has two sets of paired electrons
Calculate the total pressure (in atm) of a mixture of 0.0270 mol of helium, He, and 0.0200 mol of oxygen, O2, in a 4-L flask at 20°C. Assume ideal gas behavior.
1 mole equivalents of sodium hydroxide ( 2 mol dm^-3 solution) will be required to form the phospharane (ph3p=CHCOOEt) from the phosphonium salt (Ph3P+CH2COOEt Br-) . what volume of sodium hydroxide solution needs to be added
A catalyst introduces an extra step into the reaction and reduces Ea for the first step to 50kJ/mol. Indicate the effect of this catalyst on your diagram. How would you expect the equilibrium constant for this reaction to vary with temperature
A chemist dissolves 0.151g of pure perchloric acid in enough water to make up 0.370L of solution. Calculate the pH of the solution. Be sure your answer has the correct number of significant digits.
Which of the following aqueous solutions should demonstrate the most ideal behavior? A. 0.1 M K2SO4 B. 0.1 M CaCl2 C. 3.0 M LiF D. 0.1 M MgSO4 E. 0.1 M NaCl
at 900K the following reaction has kp=.345: 2SO2(g)+O2(g)-->2SO3(g) Partial pressures of SO2 is .150 and of O2 is .455. What is the equilibrium partial pressure of SO3?
If a current of 40.0 x 10-6 A is drawn from a solar cell for six months how many faradays are involved?
If 300kJ of heat are exchanged between the system at -5degrees C and its surroundings at 30degrees C, the entropy of the systems plus
You have three 2.00 in^3 blocks of stainless steel that have a total weight of 1.71 lb. What is the density of stainless steel in g/cm^3
The problem gives you- 1-bromo-1-methylcyclohexane and the product is cyclohexanone You have to use two reagents or mechanisms and show an intermediate
A SEM can be used to map the elemental composition of the material in the sample. How is this possible
The subscripts in a chemical formula represent the relative mass of each atom in a chemical compound. Explain why
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