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An unknown radioactive substance has a half-life of 3.20 hours. If 46.0 g of the substance is currently present, what mass was present 8.00 hours ago
Given the values of Ka and Kb below, which of the systems given would be most suitable to use to construct a buffer of pH 9
How do you determine the bond order, bond length, and bond energy of a C-O bond in the carbonate ion
The nuclide Pb-210 undergoes three successive decays (beta, alpha, and beta, respectively) to form a stable nuclide. What are the three nuclides which form from Pb-210 in this decay series
Lead and iron are common alloying elements found in brass. Would the presence of these elements complicate the analysis of brass
The rate constant of a reaction is 7.50*10-5 L/mol·s at 195°C and 5.30*10-3 L/mol·s at 258°C. What is the activation energy of the reaction, in kJ/mol
Find the pH and volume (mL) of 0.447 M HNO3 needed to reach the equivalence point(s) in titrations of each of the following
Describe how and why the ferric chloride test can be used to detect whether your reaction has gone to completion.
The following choices list some common laboratory solvents. In which of these solvents would LiCl be the LEAST soluble
Using the quantities 3 grams of salicylic acid and 6ml of acetic anhydride noted in the macro scale procedure and any other necessary data, calculate the theoretical yield in moles and grams of aspi
A solid object is made of two materials, one material having density of 2.4 g /cm3 and the other having density of 8.6 g/cm3. If the object contains un-equal masses of the materials (75/25), what is
What is the resonance structure that best describes the overall structure of the SNO+1 ion
The bond angles in H3O+ are:? a) slightly less than 109.5o b) exactly 109.5o c) slightly less than 90o d) exactly 90o
The soution in contact with the graphite electrode consists of dissolved Sn(NO3)2. The solution in contact with the copper electrode consists of dissolved CuNO3.
The procedure calls for cautions addition of water to the reaction mixture while it is still hot. What purpose does the addition of water serve and why should the addition be done while the reaction
What is the purpose of sulfuric acid or phosphoric acid used in the acetylation reaction? Use equations to explain this purpose.
The molecular shape of [TeF3 ]-1 is: A. tetrahedral B. square planar C. square pyramidal D. trigonal bipyramidal E.octahedral F. T-shaped G. see-saw, butterfly, or unsymmetrical tetrahedron
What is the electron configuration of diatomic BN+. What is its bond order
A. tetrahedral B. square planar C. square pyramidal D. trigonal bipyramidal E.octahedral F. T-shaped G. see-saw, butterfly, or unsymmetrical tetrahedron
Complete and balance the following redox reaction reaction under basic conditions: CrO4^2-(aq) + SO3^2- ? Cr(OH)3(s) + SO4^2-(aq).
Given non pourous material A having a density of 2.35 and non pourous material B having a density of 2.41 what is the theoretical density of material A+B when there is 75 weight % of material A and
Ammonium nitrate, NH4NO3, is an ingredient in fertilizer. It provides nutrient nitrogen. How much nitrogen is in exactly one U.S. ton of ammonium nitrate? Answer in kilograms and show entire process
The solubility of solute in a solvent depends on various parameters, such as temperature, pressure, the nature of the solute, and the nature of the solvent. Considering these parameters, identify th
Complete and balance the following redox reaction reaction under basic conditions- PO3^3-(aq)+ MnO4^-(aq) ? PO4^3-(aq)+ MnO2(s).