5. After recrystallizing a compound from toluene (BP 110 °C), Alex finds that the mass of the crystals keeps decreasing at a rate of ~1 mg per second on a balance. Alex decides to check the melting point of the crystals while waiting for the balance to stabilize, but gets a lowered and broadened temperature range compared to the expected melting point. What advice do you have for Alex? Identify the problem Alex is facing and a possible solution in your advice.

5. After recrystallizing a compound from toluene (BP 110 °C), Alex finds that the mass of the crystals keeps decreasing at a rate of ~1 mg per second on a balance. Alex decides to check the melting point of the crystals while waiting for the balance to stabilize, but gets a lowered and broadened temperature range compared to the expected melting point. What advice do you have for Alex? Identify the problem Alex is facing and a possible solution in your advice.

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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6:59 PM Thu Sep 21 STARTING AMOUNT here or pull up for additional resources 1 Q A X 2 W S #3 E D Ascorbic acid (C₂H₂O) is also known as Vitamin C. What quantity in molecules of C₂H₂O does a Vitamin C drink with 1025 mg C₂H₂O contain? ADD FACTOR 6.022 x 1023 x( ) 2.925 x 1022 2.925 x 10-22 4 $ R 100 1025 3.505 x 10-² 176.12 F % 5 T Question 9 of 21 G 1000 6 5.68 x 10-³ 0.001 mg C₂H₂O₂ g C₂H₂O molecules C₂H₂O₂ mol C₂H₂O g/mol C₂H₂O. ANSWER 3.505x 1024 2.925 x 10- 88.07 Y 0.010 & 7 U RESET 3.505 x 10¹¹ 5.68 x 102⁰ 2.925 x 10% 2.925 x 10 6.022 x 10²² 2 8 H J ( 1 9 O KL P ¡ { LTE C W
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76 £ LAEVE m 1 t t C80 J n D TUU 30. 40 20 C 4000 a d b (a) CH-CH₂-CH₂-CH₂-C=CH (b) CH3-CH₂-CH₂-CH₂-CH₂-CI (c) CH₂-CH₂-CH₂-CH₂-CH=CH₂ (d) CHCH2-CH2-CH2-CH2-CH3 2600 2000 2600 Wa venumberc 2000 M 1600 1000 600
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PROVISIONAL LEWIS STRUCTURES T01/S01 For each provisional structure, identify if it is the correct Lewis structure (C) or if it needs to be modified according to procedure MA or MB to obtain the correct Lewis structure. MA. Form multiple bonds to the central atom using lone pair on the terminal atom(s) until the central atom has an octet (or septet). MB. Form multiple bonds to the central atom using lone pair on the terminal atom(s) until the central atom has a formal charge of zero (0) or until two double bonds are formed. A provisional structure has the valence electrons distributed in order as (1) a bond between each pair of atoms, (2) an octet for each ligand (terminal) atom or ligand group (CH3, NH2 or OH) and (3) any remaining electrons on the central atom.
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How did they get 3? Do you always have to divide?