selenium

Q: Calculate the pH of the resulting solution if 25.0 mL of 0.250 M HCI(aq) is added to 30.0 mL of 0.25...

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Q: Which elements do not have an electronegativity value considering period 1,2,3,4 in the periodic tab...

A: On the basis of nature of noble gases it it determined that elements have not electronegative value.

Q: Q.2: For the following reaction : Na2S04 (aq) + BaCl2 (aq) I BaSO4 (s) + NaCI (aq) a- Write the bala...

A: The question is based on the concept of precipitation reactions. we are mixing two reactants and get...

Q: 14  This fatty acid is  saturated monounsaturated polyunsaturated none of the choices shown.

A: Fatty acids are carboxylic acid possessing long aliphatic carbon chain. The carbon chain present can...

Q: Answer the question written in blue

A: The concept of covalent bond was introduced by the scientist G.N. Lewis. The Lewis theory explains t...

Q: A chemist wants to determine the concentration of an acidic solution. They start by placing 25.0 mL ...

A: Molarity(M) is the moles of solute per unit volume of the solution in liters. It's unit is mol/L Num...

Q: Using the equations on page 27, calculate the atom economy (A) and reaction efficiency for each of t...

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Q: КОН k KOEE 1. С m HBr

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Q: What is the pH of a o.725 M carbonic acid (H,CO,) solution given Kal = 4.4 × 10-7 and Ka2 = 4.7 × 10...

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Q: You titrate a 0.245 grams sample of Magnesium Hydroxide with a 0.280 M HCI. Calculate the Volume (in...

A: The mass of magnesium hydroxide is = 0.245 g The molarity of the hydrochloric acid is = 0.280 M The ...

Q: Question 21 of 36 Submit Determine the pH at the point in the titration of 40.0 mL of 0.200 M HC4H,O...

A: In the given question we have to calculate the pH of acid - base reaction.

Q: In the following chemical reaction, which species is the reducing agent? 2 10, (aq) + 12 H"(aq) + 10...

A: Oxidation is defined as the process in which there is increase in the oxidation state while in reduc...

Q: er. What is the mole fraction of 2-propanol in

A: 75% 2-propanol means 75g of 2-propanol dissolved in 190g of the solution. A) mass of 2-propanol(Solu...

Q: Answer question 3

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Q: A solution is made by dissolving 22.5 g of LiC;H;O2 in 500.0 mL of water. What is the value of Kb fo...

A: Mass of LiC3H5O2 = 22.5 g Volume ( in L ) = 0.500 L No. of moles (n) = 22.5 g × 1 mol / 80 g = 0.28...

Q: Which of the following isotopes has the highest number of neutrons? 105 Pd 46 O 25 Si 14 41 K 19 104...

A: We know that, No. of neutron = mass number - atomic number thus,  

Q: Questions written in the image Answer those.

A: Since you have asked multiple questions, we will solve the first question for you. If you want any s...

Q: Calculate the heat of formation of HCI(g) using the information below: CH4lg)+ 4 Cl2(g) → CCla(g) + ...

A: Given  Enthalpy of formation of CH4  = -75 KJ Enthalpy of formation of CCl4  =  -96 KJ Enthalpy or h...

Q: For ice-water vapor system, defree of freedom,F=0. Explain how?

A: The degree of freedom is calculated by,  F=C-P+2 where, F=number of degrees of freedom C=number of c...

Q: Use the standard reaction enthalpies given below to determine

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Q: 34 a) Name one thing that can cause a protein to denature.  (No credit if you list more than one thi...

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Q: The reaction F2 + 2CIO2 → 2FCIO2 was shown to give the following results at 250 K: Exp [F2]/mol [CIO...

A: Ans : correct answer is C  

Q: Why do alkynes not didplay a cis- and trans- isomers?

A: Cis-trans Isomers: The alkenes having the same molecular formula but the arrangement of atoms in spa...

Q: The Ksp value for magnesium arsenate [Mg3(AsO4)2] is 2.00 X 10-20.  Suppose a chemist mixed 33.23 mg...

A: 3Mg2+ + 2 AsO43-  ------> [Mg3(AsO4)2] Ksp = 2.00 X 10-20 Mg2+(aq)  = 33.23 mg =  33.23  * 10-3 g...

Q: What does it mean by induced dipole when discussing London forces?

A: London forces: London forces is the weakest intermolecular force. This temporary force acts when ele...

Q: Giycolic acid is often used in skin care products. A saturated solution of its calcium salt has a [C...

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Q: 26- What is the final concentration of a solution made by mixing 160.0 mL of 1.50 M KNO3 with enough...

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Q: polyurethan can be formed from a) monmer of urethane Ob) tetrafluoroethylene c) alcohols d) hydroxyl...

A: Large no of monomers reacts with themselves and form the polymer .

Q: A compound contains 2.06% hydrogen, 32.69% phosphorus and the remaining is oxygen. What is the empir...

A: H2PO4

Q: Which of the following acids has the strongest conjugate base? A) HCIO3 B) HCIO4 C) HCI D) HCIO E) H...

A: Interpretation -  To tell about which of following acids has the strongest conjugate base -    Intro...

Q: Select the best pair of answers below justifying the reason for your answer with detailed explanatio...

A: Electrophiles are the electron-deficient neutral (polarised) or positively charged compounds (or spe...

Q: For the gas phase isomerization of cis-cyanostyrene, cis-CH,CH-CHCN- trans-CHCH-CHCN the rate consta...

A: Arrhenius Equation , [Relation between rate constant(k) and Absolute Kelvin Temperature ] is  ln[k]=...

Q: Consider the hydrolysis reaction of sucrose that produces glucose below 

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Q: Choose the thermal chemical equation to illustrates

A: overall net energy needed in the completion of the reaction is known as enthalpy of reaction. 

Q: the monmer of Polytetrafluoroethylene O a) CF3 O b) CH2 O c) CF1 O d) CF2

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Q: The following compound, indicate which one you would expect to ?have the higher boling point 2-methy...

A: Boiling point of alkenes depends on Molecular masses of compounds and arrangement of constituent Car...

Q: Consider the following reaction taking place at constant T and V: N2(g) + 3 H2(g) → 2 NH3(g) You hav...

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Q: A volume of 500.0 mL of 0.160 M NaOH is added to 565 mL of 0.200 M weak acid (K, = 5.63 × 10 ). What...

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Q: Apples are versatile fruits used in several baked and cooked dishes. A 10.0-gram apple is placed int...

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Q: In writing the equilibrium constant expression, which of the following is incorrect?A. Concentration...

A: Given: In writing the equilibrium constant expression, which of the following is incorrect?

Q: Draw compounds B and C from the following reaction scheme. excess CH3I Ag20, H20 heat A B

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Q: Q4: Sample of aluminum sulfate borate AL2(SO4)3 is heated. N H20 has a mass (0.999 g) heated until i...

A: The mass of hydrate of aluminum sulfate (Al2(SO4)3.nH2O) is = 0.999 g The mass of dehydrated salt, A...

Q: benzoic acid has higher melting point than stearic acid? why 2,2,3,3-tetramethylbutane has the highe...

A: Melting point is the temperature at which a solid compound changes to a liquid state. Every compound...

Q: n the replacement reaction of magnesium nitrate with tin, how many grams of magnesium would be produ...

A: The reaction of magnesium nitrate and tin – 2Mg(NO3)2 + Sn →Sn(NO3)4+2Mg

Q: What is the pH of a 80.0 mL solution which is 0.27 M in IO and 0.49 M in HIO? The Ka for HIO is 2.3 ...

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Q: 2S + 3O2 --> 2SO3 How many grams of sulfur (S) are needed to react with oxygen (O2) to produce 3....

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Q: Answer Q21 showing detailly each step to Justify your reasoning

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Q: The particulate model shown below represents the moles of particles present in the container after D...

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Q: A transition metal complex forms in aqueous solution, with all of its ligands initially being water....

A: the solution will turn to yellow.

Q: Answer Q32 showing detailly each step to Justify your reasoning

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