1) The document provides links to purchase homework help and exam solutions in chemistry and other courses without needing to register. Subjects include general chemistry, organic chemistry, and chemistry labs. 2) Sample problems are provided and include questions about plotting a calibration curve from dilution data, determining the empirical and molecular formulas of allicin, identifying acids and bases in a neutralization reaction, and calculating the Ksp value of a precipitate formed. 3) Other links relate to chemistry concepts like radiocarbon dating, Hess's law, saponification reactions, and writing chemical equations. Payment amounts ranging from $3-$10 are listed next to each problem or concept area.

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2. Chemistry
Chemistry - $5
I need to plot the observed emf in mV vs logarithm of ppm F to obtain a calibration
curve. From a prepared stock solution of 100 mL and the KCl molarity is 0.1M for it.
From dilution of this solution, a 20 ppm, 10ppm, 5ppm, 2.5ppm, and 1.25 ppm were
made. Im not sure how to go about setting this up. The weight of NaF used was 221
mg and the emf data for the dilutions are: 20ppm=276 mV , 10ppm=279 mV ,
5ppm=284 mV , 2.5ppm= 289 mV , 1.25ppm=297 mV.
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Allicin - $4
Allicin is the compound responsible for the characteristic smell of garlic. An analysis
of the compound gives the following percent composition by mass: C: 44.4 percent;
H: 6.21 percent; S: 39.5 percent; O: 9.86 percent. Calculate its empirical formula.
What is its molecular formula given that its molar mass is about 486g?
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Chemical Questions - $6
12. Regarding the acid-base neutralization reaction Mg(OH)2 (aq) + 2 HNO3 (aq) ? 2
H2O (l) + Mg(NO3)2 (aq), which of the following statements is true? (Points : 5)
Mg(OH)2 is the acid and HNO3 is the salt Mg(OH)2 is the base and H2O is the salt
HNO3 is the base and Mg(NO3)2 is the salt HNO3 is the acid and Mg(NO3)2 is the
salt ...
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Chemistry - $8
When 500.0 mL of 0.10 M NaOH solution (containing Na+ and OH- ions) is mixed
with 500.0 mL of 0.10 M Mg(NO3)2 solution (containing Mg2+ and NO3- ions) a
precipitate of solid Mg(OH)2 forms, and the resulting aqueous solution has pH =
9.43. Based on this information, determine the value of Ksp for Mg(OH)2. Show
your reasoning clearly. Problem 2 0.30 moles of HOCl are added to sufficient water
to make 1.0 L of solution at 25 C. Finish the table The Ka of HOCl, at 25 C, is 2.9 x
10-8, determine x. ...
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Chemistry 121 Lab - $6

3. Lab 10?Concept Map of Chemistry 121 Major Topics Lab 10 Expectations Concept
Mapping Resources Directions: Everyone should visit the first link to gain a general
understanding of what concept mapping is, how to create a concept map, and the
reasons for creating and using concept maps. Then, everyone will need to download
concept mapping software to use for this assignment. Two options are provided
below (you only need to download one form on concept mapping software, not
both!). Link 2 will direct you to free software. Link 3 will direct you to a free 30 day
trial of a different software package. Please investigate both Link 2 and Link 3 before
making your decision about which software to download! Questions? Just ask! 1. The
following website provides a clear explanation of how to develop a concept map. In
addition, this website shows you several examples of concept maps. Finally, the
website contains links to other websites that you may want to investigate:
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Chemistry in Medicine or Chemistry in the Environment - $5
Decide whether you would like to study Chemistry in Medicine or Chemistry in the
Environment. Then, carefully read each of the links under that topic, below.
Chemistry in Medicine?? Chemistry in the Environment?? Reading: You may focus
your reading on EITHER the chemistry in medicine links OR the chemistry in the
environment links. Whichever category you choose, please read the websites under
that category carefully! Please select which of these two topics you would like to
study, read the links related to that topic. 1.Decide whether you wish to study
chemistry in medicine or chemistry in the environment . 2.Post a one-paragraph
summary of the link/article of your choosing from the options listed below within
whichever category you decide (related to your selected topic).
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DNAAnalysis via Gel Electrophoresis - $10
Lab 9 DNAAnalysis via Gel Electrophoresis Introduction: Gel electrophoresis is an
important analytical technique in the fields of chemistry and biochemistry. In this
virtual experiment, we will explore the process of using gel electrophoresis to analyze
DNA samples. Your report for this lab should be submitted to the Lab 9 dropbox by
the last day of the unit. Have fun! Experiment: Go to
http://learn.genetics.utah.edu/units/biotech/gel/ and slowly begin to work through the
gel electrophoresis virtual lab, taking careful notes. Estimated time required: 1 hour.
In your lab report, answer the following prompts in complete, well developed
sentences. Be sure to paraphrase the prompts themselves into your responses, so that
your answers make sense.

4. to view the entire page, click here
Chemical Questions - $3
1) From the perspective of a chemist, explain what a crystal is. Choose two examples
of crystals, and explain how they are chemically similar to and different from one
another. 2) Explain the relationship between vapor pressure and the common phases
solid, liquid, and gas.
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Chemical Exercises - $4
Prepare written answers to the following exercises: 1. Adapted from Exercise 36 in
Ch. 11 of Introductory Chemistry: A marine biologist may need to dive deep
underwater for her research. To do so, she may want to know how to do calculations
related to pressure and volume changes that occur, depending on the depth of the
dive. Suppose she inhales air at a depth of 60 meters and at a pressure of 6 atm.
Holding her breath, the marine biologist then ascends to a depth of 10 meters (where
the pressure is now 2 atm). What volume would the air in her lungs expand to? 2.
Environmental health and safety departments employ many environmental scientists
to monitor and regulate business practices. Imagine that you work for the
Environmental Protection Agency (EPA) to ensure that gas canisters are correctly
pressurized. ...
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Radiocarbon Dating - $8
Lab 8: Radiocarbon Dating? Background: ?In this virtual laboratory activity, we will
investigate radiocarbon dating (also called carbon-14 dating), a very important and
useful chemistry application. Your laboratory report should be saved as a .doc file,
and should be submitted to the Lab 8 dropbox by the last day of the unit. Questions?
Just ask!??Laboratory Procedure:1. Go to this website.
(http://www.sciencecourseware.com/VirtualDating/files/RC0/RC_0.html) You will
notice that the website contains 12 pages (12 screens). In order to advance from one
page to the next, you first need to correctly answer each of the questions on the
current page.
to view the entire page, click here
Radiocarbon Dating - $7
Lab 8: Radiocarbon Dating? Background: ?In this virtual laboratory activity, we will
investigate radiocarbon dating (also called carbon-14 dating), a very important and

5. useful chemistry application. Your laboratory report should be saved as a .doc file,
and should be submitted to the Lab 8 dropbox by the last day of the unit. Questions?
Just ask!??Laboratory Procedure:1.
to view the entire page, click here
Hess Law Report - $6
Hess Law Review the safety materials and wear goggles when working with
chemicals. Read the entire exercise before you begin. Take time to organize the
materials you will need and set aside a safe work space in which to complete the
exercise. Experiment Summary: Students will have the opportunity to measure
temperature changes taking place in a calorimeter during neutralization reactions and
use the measurements to calculate enthalpy of reaction.They will illustrate the
validity of Hazy Law by comparing the values of enthalpy of two chemical
reactions...
to view the entire page, click here
Fats, soaps and detergents- A saponification reaction - $5
These questions are from an experiment: Fats, soaps and detergents- A saponification
reaction 1. The triglyceride and the glycerol differ with respect to polarity and H-
bonding. Discuss these two differences in terms of their chemical structures.We made
our own soap and added cottonseed oil, CaCl2, FeCl3, and HCl ( to change solution
to ph 4) to see their effects. When I added the CaCl2 a precipitate formed 2. Write an
equation for the formation of any precipitate.When i added the HCl, the solution
became cloudy 3. Write an equation for any changes observed.
to view the entire page, click here
Chemistry Questions - $4
A) What are the advantages and disadvantages of writing a chemical equation with
chemical symbols and formulas instead of just words? B) On your own words
summarize to another person the steps needed to successfully write a balanced
chemical equation. C) Describe the basic part of a chemical equation. Identify how
the physical state of elements and compounds is identified in an equation.
to view the entire page, click here

6. useful chemistry application. Your laboratory report should be saved as a .doc file,
and should be submitted to the Lab 8 dropbox by the last day of the unit. Questions?
Just ask!??Laboratory Procedure:1.
to view the entire page, click here
Hess Law Report - $6
Hess Law Review the safety materials and wear goggles when working with
chemicals. Read the entire exercise before you begin. Take time to organize the
materials you will need and set aside a safe work space in which to complete the
exercise. Experiment Summary: Students will have the opportunity to measure
temperature changes taking place in a calorimeter during neutralization reactions and
use the measurements to calculate enthalpy of reaction.They will illustrate the
validity of Hazy Law by comparing the values of enthalpy of two chemical
reactions...
to view the entire page, click here
Fats, soaps and detergents- A saponification reaction - $5
These questions are from an experiment: Fats, soaps and detergents- A saponification
reaction 1. The triglyceride and the glycerol differ with respect to polarity and H-
bonding. Discuss these two differences in terms of their chemical structures.We made
our own soap and added cottonseed oil, CaCl2, FeCl3, and HCl ( to change solution
to ph 4) to see their effects. When I added the CaCl2 a precipitate formed 2. Write an
equation for the formation of any precipitate.When i added the HCl, the solution
became cloudy 3. Write an equation for any changes observed.
to view the entire page, click here
Chemistry Questions - $4
A) What are the advantages and disadvantages of writing a chemical equation with
chemical symbols and formulas instead of just words? B) On your own words
summarize to another person the steps needed to successfully write a balanced
chemical equation. C) Describe the basic part of a chemical equation. Identify how
the physical state of elements and compounds is identified in an equation.
to view the entire page, click here