chem 218 assignment 1

Chemistry (CHEM) 217

Temporarily closed, effective April 18, 2024

Delivery mode:

Individualized study online with eText , and a Home Lab . You can order the Laboratory Kit online. CHEM 217 has a lab exemption . This course is charged a lab fee .

Area of study:

Prerequisites:

Chemistry 30 or an equivalent high school chemistry course is strongly recommended but not required. This course is open only to students with previous chemistry experience.

CHEM 209 (CHEM 217 may not be taken for credit if credit has already been obtained for CHEM 209.)

CHEM 217 is not available for challenge.

Faculty of Science and Technology

Note: Home Lab Kits can be shipped within Canada only. Students who live outside Canada are required to attend  supervised laboratories  on site at Athabasca University, Alberta.

Learning outcomes

Important links.

CHEM 217 provides an introduction to chemistry from both a theoretical and practical point of view. Topics in CHEM 217 include chemical reactions and equations; energy in chemical systems; and the structure and properties of atoms, molecules, gases, liquids, solids, and solutions. The combination of CHEM 217 and CHEM 218 is the equivalent to first-year university chemistry.

Upon successful completion of this course, you should be able to

• name chemical compounds and interpret chemical formulae.
• solve problems in chemical stoichiometry.
• describe the properties of gases and perform calculations using gas laws.
• use thermochemical data to solve chemical problems involving heat, work, and enthalpy.
• detail the quantum mechanical model of the atom and the historical atomic models that preceded it.
• recognize the periodic properties of the elements and explain them using the quantum–mechanical model of the atom.
• discuss chemical bonds using the Lewis theory, valence bond theory, and molecular orbital theory, and predict molecular shapes using the valence shell electron pair repulsion theory.
• describe intermolecular forces and apply them to explain the properties of liquids, solids, and gases.
• summarize the properties of solutions in terms of intermolecular forces and perform calculations involving the colligative properties of solutions.
• perform qualitative and quantitative chemical experiments and record and interpret results.

To receive credit for CHEM 217, you must complete all of the course work, and achieve at least 50 percent on each of the two examinations, and an overall course composite grade of at least D (50 percent) . The weighting of the composite grade is as follows:

The final examination for this course must be requested in advance and written under the supervision of an AU-approved exam invigilator. Invigilators include either ProctorU or an approved in-person invigilation centre that can accommodate online exams. Students are responsible for payment of any invigilation fees. Information on exam request deadlines, invigilators, and other exam-related questions, can be found at the Exams and grades section of the Calendar.

To learn more about assignments and examinations, please refer to Athabasca University’s online Calendar .

Tro, N. J., Fridgen, T. D., Shaw, L. E. (2020). Chemistry: A Molecular Approach (3rd Canadian Ed.) Pearson. (eText)

Mastering Chemistry is an online platform that accompanies your eText. It provides a variety of resources that may help you learn and practice the material presented in CHEM 217. It also contains the Selected Solutions Manual . (Online)

Registration in this course includes an electronic textbook. For more information on electronic textbooks , please refer to our eText Initiative site .

Other Resources

The Athabasca University course resources also include an online Study Guide and Course Orientation, as well as a Home Lab Kit (to be borrowed from the AU Science Lab) with a Home Laboratory Manual.

The items listed below are not supplied; you should purchase them before you begin to work on the course. You will need

• an electronic calculator capable of handling logarithms and exponentials.  Remember:  Take your calculator with you whenever you write an examination or attend a laboratory session.
• other stationery, including paper for assignments, pens, pencils, a ruler, etc.

Special Instructional Features

You must complete 32 hours of laboratory work, using a Home Lab Kit, to obtain credit in this course. Order the  laboratory kit  online. If you cannot make your request online, please request the Home Lab Kit from the Science Lab ( [email protected] ).

Note that your laboratory work accounts for 20% of your overall course mark. You must satisfactorily complete and write up a specified minimum number of experiments in order to obtain credit for this course.

Note: You must submit Assignment 1 before requesting the Home Lab Kit.

• Academic advising
• Program planning
• Request assistance
• Support services
• Chemistry Lab Resources
• Chemistry Lab Exemptions

Athabasca University reserves the right to amend course outlines occasionally and without notice. Courses offered by other delivery methods may vary from their individualized study counterparts.

Opened in Revision 10, April 4, 2022

Updated April 18, 2024

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Chem 218 Assignment 1 numbers 1, 2e, 2f, 2g, 3a, 3b

1.                   An analytical lab needed to determine the content of phosphorus in a commercial sample of plant food. The phosphorus in a 4.258 g sample of this plant food was converted to PO 4 3- and precipitated by adding 50.00 mL of 0.0820 M AgNO 3 . The excess AgNO 3 was then titrated using 4.06 mL of 0.0625 M KSCN. What was % P 2 O 5 in the original plant food sample?

P 2 O 5 + 9 H 2 O → 2PO 4 3- + 6H 3 O +

2PO 4 3- + 6 Ag + → 2Ag 3 PO 4(s)

Ag + + SCN - → AgSCN (s)

2.                   2.  A solution of volume 25.00 mL containing 0.0311 M Na 2 C 2 O 4 was titrated with 0.0257 M La(ClO 4 ) 3 to precipitate lanthanum oxalate:

(e)                Plot the titration curve for this titration using Excel or other spreadsheet software

(f)                  Plot the titration curve for the same titration if the concentration of the titrant is increased to 0.0500 M. What effect does this have on the shape of the titration curve?

(g)                Another analytical chemist performed the titration of the same oxalate sample using calcium to precipitate calcium oxalate. Is this a better approach to this analysis? Why or why not?

3.       3.  (a)  Calculate pCu + for the titration of 10.00 mL of 0.05000 M of I - with 0.02500 M Cu + standard solution when 4.500 mL, 20.00 mL and 21.40 mL of titrant have been added. Plot the titration curve for this titration using Excel or other spreadsheet software.

(b) Calculate pCu + for the titration of 10.00 mL of 0.05000 M of Cl - with 0.02500 M Cu + standard solution when 4.500 mL, 20.00 mL and 21.40 mL of titrant have been added. Plot the titration curve for this titration using Excel or other spreadsheet software on the same graph as (a). How does K sp value influence the shape of the observed titration curves?

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