QUESTION 5 Match the following measurements with the correct units / system v A value of 225 K is a measurement of ... v A value of 525 Kg is a measurement with the base unit of ... v A value of 75.2 mL is a measurement of ... v A value of 18 degrees Celsius is a measurement of

QUESTION 5 Match the following measurements with the correct units / system v A value of 225 K is a measurement of ... v A value of 525 Kg is a measurement with the base unit of ... v A value of 75.2 mL is a measurement of ... v A value of 18 degrees Celsius is a measurement of

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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41. The main product is:
h Oxidation: Cr2+ → Cr³+ + e Reduction: Cu²+ + 2 e¯ → Cu Net: 2 Cr²+ + Cu²+ What is the standard potential, Eºnet ? Standard Reduction Potentials Eº net Reduction Half-Reaction E° (V) Co³+ + e- → Co²+ 1.82 Au³ + + 3e- → Au(s) 1.50 Pd²+ + 2 e- → Pd 0.987 Ag++ e- → Ag(s) 0.80 Fe³+ + e- → Fe²+ 0.771 → Cu(s) 0.52 → Cu(s) 0.337 → Cut 0.153 → H₂(g) 0.00 → Sn(s) -0.14 Cu++ e- Cu²++2 e- Cu²++ e- 2H+ + 2 e- Sn²+ + 2 e- Co²+ +2 e- Cr³++ e- Fe²+ +2 e- Cr³+ +3 e- Zn²++ 2 e- A1³+ + 3 e- → Cu + 2 Cr³+ = V →Co(s) -0.28 → Cr²+ -0.41 → Fe(s) -0.44 → Cr(s) -0.74 → Zn(s) -0.763 →Al(s) -1.66
Consider the following reaction where an excess of water was used. AICI3(s) + 3H2O(1) → Al(OH)3(?) + 3HCI(g) Identify the physical state of Al(OH)3 and tell how you will separate it from the excess water. Select one: O A. A chemical method B. Electrolysis O C. Chromatography O D. Distillation O E. Filtration
I need help with questions 1-11? Could you briefly explain which answer you got for each question?
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
Select the correct starting material for the reaction shown below: 1) MgBr 2) H3O+ work up OH
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