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In terms of momentum change, explain why it is best to "give" when catching a baseball. Provide at least TWO other examples of situations in which you want "give".
A colored compound or complex ion provides a preliminary indication of the presence of which of the aluminum Group ions? Give the chemical formula
1. A sample of helium gas occupies 120 mL at 71 mmHg. For a gas sample at constant temperature, determine the volume of helium at 45 mmHg. Show your work.
a tlc plate showed two spots with rf values of 0.25 and 0.26. the plate was removed from the developing chamber the
A sample consists of, at most, 100 mg of impure salicylic acid. A student adds 1 mL of hot water and a boiling stick and heats the resulting mixture on the sand bath. Not all of the solid dissolves so the student continues to add hot water dropwise. ..
Using data in Appendix C, estimate the temperature at which the free-energy change for the transformation from I2(s) to I2(g) is zero.What assumptions must you make in arriving at this estimate?
a) Calculate the pH before addition of any KOH.b) Calculate the pH after the addition of 3.43, 8.59 and 16.17 mL of the base.(Show your work in detail for one of the volumes.)
Calculate the number of moles of Cl atoms in 1.81×1024 formula units of magnesium chloride,MgCl2 . Express your answer numerically in moles.
Describe how to prepare a 5.0% w/v solution of sodium of sodium chloride. The concentration of lead in an industrail waste stream is 0.28 ppm. What is molar concentration
Define in terms of the electronic structure of an element, chemical activity as it relates to metals, nonmetals, and noble gases. Discuss the change in chemical activity of metals as you go down a group.
Identify the qual 1 cation that is confrimed present in a reference solution by the formation of a precipitate? by the color of a soluble complex ion?
A mixture of CaCO3 and CaO weighing 0.680 g was heated to produce gaseous CO2. After heating, the remaining solid weighed 0.489 g.
lambda(symbol) for one line of the hydrogen spectrum is .4118 x 10^-4 cm. Use this value in the Rydberg equation to calculate the RH value using n1 = 2, and n2 = 3.
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