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1) Name the chemical family of elements that is absent from Mendeleev's table.
2) Which 4 elements were missing from mendeleev's periodic table? atomic masses: 45, 68, 70, 180
3) List 5 properties of metals
copper has two isotopes:cu-63 (abundance= 69.2%, mass= 62.930 amu) and cu-65 (abundance= 30.8% mass= 64.428 amu). calculate the (average) atomic mass of copper.
the average soil organic carbon content = 0.01%. assume that soil organic carbon is the primary sorbent and that degredation and dispersion are negligible.
What volume of 0.100 M sodium hydroxide is required to completely neutralize 50.0 mL of 0.100 M phosphoric acid? A 25.0-mL solution of 3.00 M acetic acid (HC2H3O2) required 65.6 mL of NaOH
Calculate the enthalpy of the reaction: 2NO(g) + O2(g) --> 2NO2(g) given the following reactions and enthalpies of formation:
A sample of gas has an initial volume of 13.8L at a pressure of 1.26 atm If the sample is compressed to a volume of 10.8L, what will its pressure be?
A weather balloon at launch is partially inflated with 3.00 times 10 power 4l of helium at STP. what will be the volume of helium at an altitude of 7km, where the pressure is 0.41atm and the temperature is -20 degrees Celsius?
Radioactive isotope X has been found in rock units S and Q. Isotope X breaks down into isotope Z with a half life of 250 million years.
Using the reaction 2C6H6+15O2--->12CO2+6H2O, what volume of carbon dioxide will be produced when 128.0 grams of benzene react.
Balance the following equation in basic solution. indicate which reactant becomes oxidized during the reaction, which reactant becomes reduced
What is the NMR spectrum of benzene, Suppose Dewar,Ladenburg,and Kekul?? had had a 13 C NMR spec- trometer.How many signals would the various candidates
What is the osmotic pressure of a solution made from dissolving 90.0 g of glucose, rm C_6H_{12}O_6, in 650 mL of water at 14.0{^circ}C.
A 270- mL flask contains pure helium at a pressure of 749 torr. A second flask with a volume of 470 mL contains pure argon at a pressure of 730 torr what is the partial pressure of He?
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