Chemistry
10th Edition
ISBN: 9781305957664
Author: ZUMDAHL, Steven S.
Publisher: Cengage Learning,
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Textbook Question
Chapter 2, Problem 56E
In the periodic table, how many elements are found in each of the following?
- a. the hologen family
- b. the alkali family
- c. the lanthanide series
- d.
transition metals
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(a) The following synthesis of the molecule shown in the circle has a major problem. What is this problem? (2
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1) HBr
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2) H-
NaNH2
Br
3) NaNH,
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5) H2, Pd
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2024 Fall Term (1) Organic Chemistry 1 (Lec)
CHEM 22204 02[6386] (Hunter College)
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syntheses of the circled molecules shown below. More than one step is needed in each case. Indicate the
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alt
ons for
Free Response Questions
FRQ 1:
0/5
To spectrophotometrically determine the mass percent of cobalt in an ore containing cobalt and
some inert materials, solutions with known [Co?) are prepared and absorbance of each of the
solutions is measured at the wavelength of optimum absorbance. The data are used to create a
calibration plot, shown below.
0.90-
0.80-
0.70
0.60
0.50
0.40-
0.30
0.20-
0.10-
0.00-
0.005
0.010
Concentration (M)
0.015
A 0.630 g sample of the ore is completely dissolved in concentrated HNO3(aq). The mixture is diluted
with water to a final volume of 50.00 ml. Assume that all the cobalt in the ore sample is converted to
Co2+(aq).
a. What is the [Co2] in the solution if the absorbance of a sample of the solution is 0.74?
13
✗
b. Calculate the number of moles of Co2+(aq) in the 50.00 mL solution.
0.008 mols Co
Please correct answer and don't used hand raiting
Chapter 2 Solutions
Chemistry
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