The boiling point of HCl is -85°C but the boiling point of HBr is -66°C. Identify the major intermolecular force that accounts for the difference Link to Physical Constants Link to Periodic Table Select one: O a. Dipole-dipole forces O b. Hydrogen bonding O c. London dispersion forces d. lon-dipole forces O e. Sigma bond

46 gr sodium (Na) reacts with excess HCl aqueous solution according to the reaction: 2Na (s) + 2HCI(aq) → 2NaC1 (aq) + H2 According to this; which of the followings is wrong? (Na:23 21 - g/mol, ClI:35.5 g/mol, H:1 g/mol) O A) 2 gr H2 is produced B) 58.5 gr NaCl is formed O C) To consume all sodium, 2 moles of HCl is needed. D) Na atoms ionize in HCl aqueous solution. O E) 2 moles NaCl is formed

3b. An impure sample of ammonium dichromate [ (NH4)2Cr207] was analyzed to determine its purity [ %(m/m) of ammonium dichromate]. a. A 1.4325 gram sample of the impure (NH4)2Cr207 was heated and decomposed in the following (unbalanced equation) reaction: • Balance the chemical equation: [ Select ] (NH4)2Cr2O7(s) [ Select ] N2(g) [ Select ] H20(L) + + [ Select ] | Cr2O3(s) b. The decomposition of the 1.4325 g of the impure sample produces 0.1252 liters of nitrogen gas (N2(g) that were collected at a temperature of 24.7°C and a pressure of 1.032 atmospheres: o Calculate the number of moles of nitrogen (N2(g)) collected in this reaction: [ Select ] mol N2 • Calculate the mass of the ammonium dichromate [ (NH4)2Cr20, ] in the sample (1.4325 g): [ Select ] g (NH4)2Cr2O7 o Calculate the %(m/m) of the ammonium dichromate in the impure sample: [ Select ] %(m/m) (NH4)2Cr2O7

2 2 X. Fo fff O-S-CH3 01S1O 0-S-CH3 F OTS CH3NH DMSO Br DMF Br EtOH CH3NH DMSO Yor + Br - Br X -S-CH3 -S-CH3 NHCH3 + OTS OP NHCH3 + F

Moquie $0 219 OWLV2 keAssignment/takeCovalentActivity.do?locator-assignment-take In the following equation for a chemical reaction, the notation (s), (I), or (g) indicates whether the substance indicated is in the solid, liquid, or gaseous state. 2SO₂(g) + O₂(g) →→→2SO3(g) + energy The reaction is Q Search Identify each of the following as a product or a reactant: SO3(g) SO₂(g) 0₂(g) When the reaction takes place energy is Submit Answer 7 L M te OWLv2 | Online teaching and X * Use the References to access important values if needed for this question. Retry Entire Group K CO 144 www.yo up 8 more group attempts remaining L 11 b Answered: For the reaction 2 x + 111 P g P¹ ins prt sc. delete Previous backspace ^ GG 4 home GURN lock 7 home A 6:52 PM 5/14/2023 74 X In

2.) Five standardized dilutions of aqueous lead(11) chromate solution were prepared by adding a volume of 0.0010 M PbCrO4(ag) from a buret and then diluting the solution with deionized water to a total volume of 100.0 mL. Use the provided information to determine [CrO42] in each. Hint: enter the decimal before the scientific notation. Mixture Initial Buret Reading (mL) Final Buret Reading (mL) [Cro,?] (M) 3 2.00 7.10 ? x 105

You have a 11.5 mg sample of blood that contains various proteins. Hemoglobin is the only protein in the sample containing Fe. Hemoglobin contains 3.83% by mass of a compound called heme (C₃₄H₃₂FeN₄O₄, MW = 616.49 g/mol). You find that your 11.5 mg blood sample contains 34.9 micrograms of Fe. What is the mass percent of hemoglobin in your protein sample?   -don't prematureley round