CHEMISTRY+CHEM...(LL)-W/ACCESS >CUSTOM<
10th Edition
ISBN: 9780357096949
Author: Kotz
Publisher: CENGAGE C
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Chapter 13, Problem 44PS
Anthracene, a hydrocarbon obtained from coal, has an empirical formula of C7H5. To find its molecular formula, you dissolve 0.500 g in 30.0 g of benzene. The boiling point of pure benzene is 80.10 °d whereas the solution has a boiling point of 80.34 °C. What is the molecular formula of anthracene?
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10. Amoxicillin (figure X) is one of the
most widely used antibiotics in the
penicillin family. The discovery and
synthesis of these antibiotics in the 20th
century made the treatment of infections
that were previously fatal routine.
About amoxicillin, mark the correct one:
HO
NH2 H
S
-N.
HO
Figura X. Amoxicilina
A) It has the organic functions amide,
ester, phenol and amine.
B) It has four chiral carbons and 8
stereoisomers.
C) The substitution of the aromatic ring
is of the ortho-meta type.
D) If amoxicillin reacts with an alcohol it
can form an ester.
E) The structure has two tertiary
amides.
62
The environmental police of a Brazilian state received a report of contamination of a river by inorganic arsenic, due to the excessive use of pesticides on a plantation on the riverbanks. Arsenic (As) is extremely toxic in its many forms and oxidation states. In nature, especially in groundwater, it is found in the form of arsenate (AsO ₄ ³ ⁻ ), which can be electrochemically reduced to As ⁰ and collected at the cathode of a coulometric cell. In this case, Potentiostatic Coulometry (at 25°C) was performed in an alkaline medium (pH = 7.5 throughout the analysis) to quantify the species. What potential (E) should have been selected/applied to perform the analysis, considering that this is an exhaustive electrolysis technique (until 99.99% of all AsO ₄ ³ ⁻ has been reduced to As ⁰ at the electrode, or n( final) = 0.01% n( initial )) and that the concentration of AsO ₄ ³ ⁻ found in the initial sample was 0.15 mmol/L ?
Data:
AsO ₄ 3 ⁻ (aq) + 2 H ₂ O ( l ) + 2 e ⁻ → A s O ₂ ⁻ ( a…
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14:17
15. Water-soluble proteins are denatured
when there is a change in the pH of the
environment in which they are found. This
occurs due to the protonation and
deprotonation of functional groups
present in their structure. Choose the
option that indicates the chemical bonds
modified by pH in the protein represented
in the following figure.
E
CH2
C-OH
CH2
H₂C
H₁C
CH
CH3
CH3
CH
CH₂-S-S-CH₂-
910
H
B
-CH2-CH2-CH2-CH₂-NH3* −0—C—CH₂-
○ A) A, C e D.
• В) Вес
○ C) DeE
○ D) B, De E
○ E) A, B e C
68
Chapter 13 Solutions
CHEMISTRY+CHEM...(LL)-W/ACCESS >CUSTOM<
Ch. 13.1 - (a) If you dissolve 10.0 g (about one heaping...Ch. 13.2 - Use the data in Table 13.1 to calculate the...Ch. 13.3 - Prob. 13.3CYUCh. 13.4 - Assume you dissolve 10.0 g of sucrose (C12H22O11)...Ch. 13.4 - What quantity of ethylene glycol, HOCH2CH2OH, must...Ch. 13.4 - In the northern United States, summer cottages are...Ch. 13.4 - Bradykinin is a small peptide (9 amino acids; 1060...Ch. 13.4 - An aluminum-containing compound has the empirical...Ch. 13.4 - A 1.40-g sample of polyethylene, a common plastic,...Ch. 13.4 - Calculate the freezing point of 525 g of water...
Ch. 13.5 - The blue line on the diagram illustrates the...Ch. 13.5 - How many theoretical plates are required to...Ch. 13.5 - Prob. 1.3ACPCh. 13.5 - The vapor pressure of pure heptane is 361.5 mm Hg...Ch. 13.5 - If the headspace of a soda is 25 mL and the...Ch. 13.5 - Prob. 2.2ACPCh. 13.5 - Prob. 2.3ACPCh. 13.5 - Prob. 2.4ACPCh. 13.5 - Prob. 3.1ACPCh. 13.5 - Prob. 3.2ACPCh. 13.5 - Prob. 3.3ACPCh. 13 - You dissolve 2.56 g of succinic acid, C2H4(CO2H)2,...Ch. 13 - You dissolve 45.0 g of camphor, C10H16O, in 425 mL...Ch. 13 - Prob. 3PSCh. 13 - Prob. 4PSCh. 13 - Prob. 5PSCh. 13 - Prob. 6PSCh. 13 - Prob. 7PSCh. 13 - Prob. 8PSCh. 13 - Hydrochloric acid is sold as a concentrated...Ch. 13 - Concentrated sulfuric acid has a density of 1.84...Ch. 13 - The average lithium ion concentration in seawater...Ch. 13 - Silver ion has an average concentration of 28 ppb...Ch. 13 - Which pairs of liquids will be miscible? (a) H2O...Ch. 13 - Acetone, CH3COCH3, is quite soluble in water....Ch. 13 - Prob. 15PSCh. 13 - Use the following data to calculate the enthalpy...Ch. 13 - You make a saturated solution of NaCl at 25 C. No...Ch. 13 - Some lithium chloride, LiCl, is dissolved in 100...Ch. 13 - Prob. 19PSCh. 13 - The Henrys law constant for O2 in water at 25 is...Ch. 13 - An unopened soda can has an aqueous CO2...Ch. 13 - Hydrogen gas has a Henrys law constant of 7.8 104...Ch. 13 - A sealed flask contains water and oxygen gas at 25...Ch. 13 - Butane, C4H10, has been suggested as the...Ch. 13 - A 35.0-g sample of ethylene glycol, HOCH2CH2OH, is...Ch. 13 - Urea, (NH2)2CO, which is widely used in...Ch. 13 - Pure ethylene glycol, HOCH2CH2OH, is added 2.00 kg...Ch. 13 - Pure iodine (105 g) is dissolved in 325 g of CCl4...Ch. 13 - Prob. 29PSCh. 13 - What is the boiling point of a solution composed...Ch. 13 - Prob. 31PSCh. 13 - Prob. 32PSCh. 13 - Prob. 33PSCh. 13 - Some ethylene glycol, HOCH2CH2OH, is added to your...Ch. 13 - You dissolve 15.0 g of sucrose, C12H22O11, in a...Ch. 13 - A typical bottle of wine consists of an 11%...Ch. 13 - Prob. 37PSCh. 13 - Estimate the osmotic pressure of human blood at 37...Ch. 13 - An aqueous solution containing 1.00 g of bovine...Ch. 13 - Calculate the osmotic pressure of a 0.0120 M...Ch. 13 - You add 0.255 g of an orange, crystalline compound...Ch. 13 - Butylated hydroxyanisole (BHA) is used in...Ch. 13 - Benzyl acetate is one of the active components of...Ch. 13 - Anthracene, a hydrocarbon obtained from coal, has...Ch. 13 - An aqueous solution contains 0.180 g of an...Ch. 13 - Aluminon, an organic compound, is used as a...Ch. 13 - Prob. 47PSCh. 13 - To make homemade ice cream, you cool the milk and...Ch. 13 - List the following aqueous solutions in order of...Ch. 13 - Arrange the following aqueous solutions in order...Ch. 13 - When solutions of BaCl2 and Na2SO4 are mixed, the...Ch. 13 - The dispersed phase of a certain colloidal...Ch. 13 - Phenylcarbinol is used in nasal sprays as a...Ch. 13 - (a) Which aqueous solution is expected to have the...Ch. 13 - Arrange the following aqueous solutions in order...Ch. 13 - Prob. 56GQCh. 13 - Dimethylglyoxime [DMG, (CH3CNOH)2] is used as a...Ch. 13 - A 10.7 m solution of NaOH has a density of 1.33...Ch. 13 - Concentrated aqueous ammonia has a molarity of...Ch. 13 - Prob. 60GQCh. 13 - If you want a solution that is 0.100 m in ions,...Ch. 13 - Consider the following aqueous solutions: (i) 0.20...Ch. 13 - (a) Which solution is expected to have the higher...Ch. 13 - The solubility of NaCl in water at 100 C is 39.1...Ch. 13 - Instead of using NaCl to melt the ice on your...Ch. 13 - The smell of ripe raspberries is due to...Ch. 13 - Hexachlorophene has been used in germicidal soap....Ch. 13 - The solubility of ammonium formate, NH4CHO2, in...Ch. 13 - How much N2 can dissolve in water at 25 C if the...Ch. 13 - Cigars are best stored in a humidor at 18 C and...Ch. 13 - An aqueous solution containing 10.0 g of starch...Ch. 13 - Prob. 72GQCh. 13 - Calculate the enthalpies of solution for Li2SO4...Ch. 13 - Water at 25 C has a density of 0.997 g/cm3....Ch. 13 - If a volatile solute is added to a volatile...Ch. 13 - A solution is made by adding 50.0 mL of ethanol...Ch. 13 - A 2.0% (by mass) aqueous solution of novocainium...Ch. 13 - A solution is 4.00% (by mass) maltose and 96.00%...Ch. 13 - The following table lists the concentrations of...Ch. 13 - A tree is 10.0 m tall. (a) What must be the total...Ch. 13 - Prob. 81GQCh. 13 - A compound is known to be a potassium halide, KX....Ch. 13 - Prob. 85GQCh. 13 - If one is very careful, it is possible to float a...Ch. 13 - A solution of benzoic acid in benzene has a...Ch. 13 - You dissolve 5.0 mg of iodine, I2, in 25 mL of...Ch. 13 - Prob. 89ILCh. 13 - In a police forensics lab, you examine a package...Ch. 13 - An organic compound contains carbon (71.17%),...Ch. 13 - Prob. 92ILCh. 13 - When sails of Mg2+, Ca2+, and Be2+ are placed in...Ch. 13 - Explain why a cucumber shrivels up when it is...Ch. 13 - Prob. 95SCQCh. 13 - A 100.-gram sample of sodium chloride (NaCl) is...Ch. 13 - Prob. 97SCQCh. 13 - Prob. 98SCQCh. 13 - Starch contains CC, CH, CO, and OH bonds....Ch. 13 - Prob. 100SCQCh. 13 - You have two aqueous solutions separated by a...Ch. 13 - Prob. 102SCQCh. 13 - Sodium chloride (NaCl) is commonly used to melt...Ch. 13 - Prob. 105SCQCh. 13 - Prob. 106SCQCh. 13 - Prob. 107SCQ
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Solutions: Crash Course Chemistry #27; Author: Crash Course;https://www.youtube.com/watch?v=9h2f1Bjr0p4;License: Standard YouTube License, CC-BY