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Explain how is the concept of effective nuclear charge used to simplify the numerous electron-electron repulsions in a many-electron atom?
Explain which experiences a greater effective nuclear charge in a Be atom, the 1s electrons or the 2s electrons?
what is the expected freezing point of a 0.50 m solution of li2so4 in water? kf for water is
Compute the quantity of work(W) that is associated with a 9.5 Litre expansion of a gas against the given pressure of 755mm Hg
Calculate the number of moles of liquid propane that can be stored in the same volume if the density of the liquid is 0.590 {rm{g}}/{{rm{mL}}}.
What is the redox number for nitrogen in a molecule of nitrogen dioxide
The earth uses 15 tettrawatts of power Sunlight striking the earth provides 1.336kw per square meter. The surface area of the earth is 197,000,000 square miles.
Calculate the density of a cube of unknown mental which weighs 38g and has a side of length 4cm.
Calculate the partial pressure of propane in a mixture that contains equal masses of propane (C3H8) and butane (C4H10) at 20.0 °C and 738 mm Hg.
A chemist dissolves 0.9 g of an unknown monoprotic (one acidic H) acid in water. She finds that 14.6 mL of 0.426 M NaOH are required to neutralize the acid.
A compound has been analyzed and has been found to have the following composition: copper, 66.75%; phosphorus, 10.84%; oxygen, 22.41%. Determine the empirical formula of the compound.
a laser emits a pulse of light containing 7.99 times10-15 j of energy at a frequency of 3.32 times1015 hz. how many
Explain the role of mass and dispersion forces versus the presence of hydrogen bonding? Which seems to play a more significant role
What is this hardness concentration expressed in ppm CaCO3. THe hardness of a water sample is known to be 500 ppm CaCO3. IN an analysis of a 50 mL water sample, what volume of 0.0100 M Na2H2Y is needed to reach the endpoint
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