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A 73.8 gram sample of CaSeO42H2O was heated thoroughly in a porcelain crucible, until its weight remained constant. After heating, how many grams of the anhydrous compound remained?
a calorimeter containing 200.0 ml of water was calibrated by carrying out a reaction which released 15.6 kj of heat. if
What bond angles do you expect for each of the following? (a) The F---S---F angle in SF2 (b) The H---N---N angle in N2H2 (c) The F---Kr---F angle in KrF4 (d) the Cl----N----O angle in NOCL
which of the following indicators would be most suitable for the titration of acetic acid (pKa=4.74) with NaOh?
A solution is prepared by dissolving 11.60g of a mixture of sodium carbonate and sodium bicarbonate in 1.00 L of water. A 300.0-cm^3 sample of the solution is then treated with excess HNO3 and boiled to remove all the dissolved gas.
What quality of heat energy, in J, is required to raise the temperature of 454g of tin from room temperature, 25.0C to its melting point, 231.9C, and then melt the tin at that temperature
A hypothetical element Z has two stable isotopes: Z-46 = 46.046 u 64.08% Z-51 = 50.826 u 35.92% What is the average atom weight of the element?
Write the structural formula of the main organic product for the following reaction between an alcohol, tosyl chloride, and then a nucleophile.
170 mL of an HCl solution with pH of 2.60 is added to 200 mL of an HNO3 solution. The resulting pH is 1.40. What was the pH of the original HNO3 solution?
A voltaic cell consists of a Zn/Zn^2 + half-cell and a Ni/Ni^2 +half-cell at 25C. The initial concentrations of Ni^2 + and Zn^2 + are 1.70 M and 0.100 M, respectively.
a voltaic cell consists of mnmn2 and cdcd2 half-cells containing equal volumes of solutions with the following initial
Explain which of the following species has the shortest, strongest covalent bond: CN^- , CO2 , C2^2- , CO^2- , CO
When a student transfered HCL to a graduated cylinder for addition to the sample , several drops ran down the outside of the cylinder and on to the laboratory bench . Explan the potential danger of this situation , and suggest a good way to clean ..
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