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(a) Moseley's experiments on X-rays emitted from atoms led to the concept of atomic numbers Where exactly do these X-rays come from? Draw an energy-level diagram to explain.
(b) Why are chemical and physical properties of the elements more closely related to atomic number than they are to atomic weight?
Thin-layer chromatograph------Describe how the Rf for a compound will change as the developing solvent is made more polar. What is meant by "developing" a TLC plate. What is meant by "visualization" of a TLC plate
What is the boiling point of water at an altitude where the ambient air pressure is 0.47 bar? The enthalpy of vaporization of water near its boiling point is 40.7 kJ/mol.
By requiring to evaluate the integral (Use 100,000 m/s for an upper limit on velocity), determine the percentage of hydrogen atoms that have speed greater than the escape velocity which the maximum season temperature of Mars is 293 K.
a reaction that establishes equillibrum with almost no reactants pressent will be one of the following. a) exergonic reaction b) has a negative G degree c) has a large keq d) all of the above
A solution of NaOH(aq) contains 7.4 g of NaOH(s) per 100.0 mL of solution. Calculate the pH and the pOH of the solution at 25 °C.
Write equations showing how each of the following weak bases ionizes water to form OH- a) HCO3- b) CH3NH2 Identify all of the phases in the answer (ex: NH3 = NH3(aq)+H2O(l) NH4+(aq)+OH-(aq))
Determine the relative abundance in of each isotope in the synthesized material. To make it easy, use whole numbers (intergers) for the atomic mass of the meitnerium isotopes in your calculations.
Calculate the rpoportion of I2 (iodine) molecules in their ground state, first excited stated
Determine the binding energy of an O-16 nucleus. The O-16 nucleus has a mass of 15.9905 amu, A proton has a mass of 1.00728 amu, a neutron has a mass of 1.008665amu, and 1amu is equivalent to 931 MeV of energy.
Calculate the number or calories of heat energy required for warming 34.6g of water from 18.9 celsius to 29.9 celsius
zn s 2hcl liq -gt h2 g zncl2 s how many moles of zncl2 form when 6.3 mol of zn
Given the values of Ka and Kb below, which of the systems given would be most suitable to use to construct a buffer of pH 9 and WHY
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