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A. Give the symbol of the element in the fifth period of the periodic table with five valence electrons. (Express your answer as a chemical symbol)
B. Give the symbol of the element in the fourth period of the periodic table with four 4p electrons. (Express your answer as a chemical symbol)
C. Give the symbol of the element in the fourth period of the periodic table with one 3d electron. (Express your answer as a chemical symbol)
D. Give the symbol of the element in the fifth period of the periodic table with a complete outer shell. (Express your answer as a chemical symbol)
1.0 mol of CaCN2 and 1.0 mole of water are mixed together: CaCN2 + 3 H2O → CaCO3 + 2 NH3 How much NH3 could be produced?
A 757 mL gas sample at STP is compressed toa volume of 202 mL, and the temperature isincreased to 30 degrees C. What is the new pressureof the gas in Pa?
How many grams of cholesterol are in 230 mL of blood? The concentration of cholesterol (C_27H_46O) in blood is approximately 5.0mM.
At a particular temperature, K = 4.0 x 10^-7 for the reaction N2O4(g) ---> 2NO2(g). In an experiment, 1.0 mol N2O4 is placed in a 10.0L vessel. Calculate the concentrations of N2O4 and NO2 when this reaction reaches equilibrium.
A second assay was performed by making a derivative, ammonium phospho-molybdate, which has visible absorption peak at ~ 400nm. From the Beer's Law plot, estimate the concentration of the unknown solution
Based on the first and fourth sketches(Part C figure) , what is the density of the block? First sketch shows mass of the block = 50g. Second sketch shows block completely immersed in water(at 20 degree Celsius), mass of block now = 5.6g and densit..
Elemental exonium (not a real element) consists of two major isotopes
How many different kinds of polypeptides, each composed of 12 amino acids, could be synthesized using the 20 common amino acids?
Describe the nature and characteristics of PCB's. Why are they of importance to an EH&S or FS professional who encounters them when coming upon an incident scene where they are present?
celcius have enough energy to overcome the activation energy barrier for a particular reaction, what is the activation energy for this reaction
Describe the effect of this on [CH3COOH] and [CH3COO-] (their concentrations). Account for your answer in terms of number of moles of protons transferred. Also, has the capacity of the buffer been exceeded? Explain.
A mixture of MgCO3 and MgCO3·3H2O has a mass of 3.057 g. After heating to drive off all the water the mass is 2.790 g. What is the mass percent of MgCO3·3H2O in the mixture.
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