Chemistry

the complex ion [co(h2o)6]3 is blue in an aqueous solution. estimate the wavelength of maximum absorbance.a) 200 nmb) 300 nmc) 400 nmd) 600 nme) 800 nm
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If a molecule with a central atom that has five regions of electron density has exactly one lone pair of electrons, what will its molecular geometry be?Select the correct answer below:A. square planarB. trigonal pyramidC. seesawD. tetrahedral
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The balanced equation Fe(s) + 2HCl(aq) FeCl2(aq) + H2(8) can be interpreted to mean that ? a)1 mol of Fe reacts with 2 mol of HCL b)1 mol of Fe reacts to produce 2 mol of FeCl2 c) 2 g of HCl reacts to produce 1 g of H2 4)1 g of Fe reacts to produce 1 g of FeCl2
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find the pOH for the following:A 1.34 x 10^-4 M solution oh hydrochloride acid
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Jayadev has apassion for photography. Maker the there films out of silver chloride which De composes when expos to light write the balanced equation.for the reaction
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How many grams of BaSO4 can be produced from 200.0 g of Ba(NO3)2 and 100.0 g of Na2SO4? Which is limiting reactant? How much excess reactant remains?
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the equilibrium constant for a base ionization reaction is called the: select the correct answer below: a. base equilibrium constantb. base ionization constant c. basicity index d. none of the above
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Which of the following explains how one of the postulates in John Dalton's atomic theory was later subjected to change?Choice 1Various scientists found that all atoms of a particular element are identicalChoice 2Some scientists found that atoms combine in simple whole number ratios to form compounds.Choice 3Various scientists found that atoms consist of subatomic particles with varying mass and charge.Choice 4Some scientists found that bonds between atoms are broken, rearranged, or reformed during reactions.
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most nucleophilic and the least nucleophilic of the following: a) BH3 b) HCCNa c) CH3CH2OH d) NH3 e) CH3CH2ONa
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The balanced equation for the reaction between phosphoric acid and sodium hydroxide is: H3PO4 (aq) + 3 NaOH (aq) Na3PO4 (aq) + 3 H2O(l) In a titration, what volume of 1.77 M phosphoric acid is required to neutralize 34.0 mL of 0.550 M sodium hydroxide?
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Predict whether each of the following molecules is polar or nonpolar: (a) IF, (b) CS2, (c) SO3, (d) PCl3, (e) SF6, (f) IF5.
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when a 2.0 gram strip of zn metal is placed in a solution of 1 g agno3, what is the limiting reagent?
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Using the periodic table to locate the element, write the condensed electron configuration of Ni.
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allows one to convert between moles of electrons and equivalent amount of charge in units of coloumbs
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Draw the Lewis structure for AsF5 and then answer the questions that follow. . b What is the electron-pair geometry for As in AsF5? c What is the the shape (molecular geometry) of AsF5?
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calculate the pH of the solution obtained if 40cm^3 of 0.2M HCl was added to 30cm^3 of 0.1M NaOH
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if a solute dissolves in water to form a solution that does not conduct an electric current, the solute is a(n)
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a sample of gas is found to exert 14.00 kPa at 353 K.What pressure would the sample exert if the gas was heated to 376 K
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draw one of the aldoses that yields d-xylose on wohl degradation. draw your answer as a fischer projection.
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According to Arrhenius theory, which of the following is a base?a) CsOHb) HOOHc) CH3OHd) HCOOHe) CH3COOH
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exactly 1 mole of na2so3 contains how many moles of na s and o
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An electron in a one-dimensional box requires energy with wavelength 8080 nm to excite it from the n = 2 energy level to the n = 3 energy level. Calculate the length of the box. For a 1-D particle in a box, the quantized energy is given by:a. 1.50 nmb. 3.50 nmc. 3.00 nmd. 1.00 nme. 2.50 nm
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the 'a' form of glycogen phosphorylase is present. which of the following are likely (select all that apply): only the r form exists only the t form exists allosteric effectors are less potent allosteric effectors are more potent glucagon is in the bloodstream insulin is in the bloodstream
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If the student had ground up the calcium carbonate chips into a powder and run the tests again, what would you expect to happen to the rate of reaction? Briefly explain why by applying collision theory
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