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Calculate the most probable distance from the nucleus for a 1s electron in a hydrogen atom.
A gas is confined to a cylinder under constant atmospheric pressure. When 415 J of heat is added to the gas, it expands and does 106 J of work on the surroundings. What is the value of \Delta H for this process? What is the value of \Delta E for t..
Which of the following compounds would you expect to be ionic?
Calculate the molarity of Ba(OH)2 solution if a55.00 mL portion of this solution
When the valves are opened and the gases are allowed to mix at constant temperature, what is the distribution of atoms in each container. Assume that the containers are of equal volume, and ignore the volume of the tubing connecting them.
Half-life equation for first-order reactions: where is the half-life in seconds , and is the rate constant in inverse seconds . Part A What is the half-life of a first-order reaction with a rate constant
A 52.2 g block of an unknown metal at 85.5oC was dropped into an insulated vessel containing approximately 37 g of ice and 27 g of water at 0oC. After the system had reached equilibrium
A laser pulse of light with a frequency of 1.14 × 1020 Hz contains 2000 photons. Calculate the energy in J of the pulse.
Describe the development of the modern periodic table. Include contributions made by Lavoisier, Newlands, Mendeleev, and Moseley.
For each of the five principles of biochemistry give an example(step or series) from a biochemical pathway that satisfies each principle
The average C--H bond energy in CH4 is 415 kJ/mol. Use the following data to calculate the average C--H bond energy in ethane (C2H6; C--C bond), in ethene (C2H4; C=C bond), and ethyne (C2H2; C (triple bond) C).
An astrology-loving friend hypothesizes that people born in that week like horror movies more than other genres of movies. You decide to use the scientific method to test this hypothesis.
Write a semi-quantitative expression which describes the lattice energy of an ionic crystal. Define and explain all terms used, and explain how they may effect the properties of the crystal.
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