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CH110/120 Assignment #1 Version C General Instructions   There are four versions of this assignment; you can choose which version you would like to submit

Chemistry

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CH110/120 Assignment #1 Version C General Instructions

 

1. There are four versions of this assignment; you can choose which version you would like to submit. You should submit only one version.

 

2. You must submit your assignment to Gradescope as a .pdf. Please review the instructions for how to submit an a .pdf assignment. There are also instructions on MyLS for how to convert images to a .pdf if you need to do so.

 

You should answer questions using the formatting that has been provided. There several ways that you could do this:

 

1. You can print the assignment, complete it on paper, and then follow the instructions in the Gradescope folder on MyLS to take a picture, save as a .pdf, and upload to Gradescope.

 

2. You could do your work on paper, take a picture, and insert the image in the Word document. You can save this document as a .pdf and upload to Gradescope.

 

3. You could do all your work on your own paper (no printer), and then follow the instructions in the Gradescope folder on MyLS to take a picture, save as a .pdf, and upload to Gradescope.

 

4. Students with tablets may want to fill out this document on their device, convert it to .pdf, and upload to Gradescope.

 

3. You must show full work (include units) for your problems. You do not need to show how you calculate your molar masses (but be careful that you calculate them correctly). 

 

4. You are permitted to use your textbook and other course resources (MyLS) and to talk to your classmates about this assignment, but your submission must be your own individual work. You should not copy the work of others. You should not share your work with others. You should not accept help from others who want to send you their work.

 

5. You are required to sign the Academic Integrity Pledge at the end of the assignment.

 

 

 

Academic Integrity

It is expected that all students will follow assignment instructions and will adhere to Laurier’s regulations with respect to Academic Integrity.

The following violate Laurier’s Academic Code of Conduct:

1. Posting assignment questions to message boards, social media, or other unauthorized websites (ex. Reddit and Chegg). These questions are the intellectual property of your course instructor, and you do not have permission to share them outside those registered in our class.

 

2. Posting assignment answers in virtual "course groups" (ex. Facebook, Discord or WhatsApp). While you can discuss problem solving strategies, it is expected that you will carry-out the problem solving independently.

 

3. Sending your work to other students. You are not permitted to send your assignment solutions to another student. Your course instructor understands that you might be doing this with the intention of helping a classmate, but this kind of “help” directly violates Section 4.01 of Laurier’s Academic Code of Conduct: misconduct is an act by a student, or by students working on a team project, which may result in a false evaluation of the student(s), or which represents an attempt to unfairly gain an academic advantage, where the student either knew or ought reasonably to have known that it was misconduct.

 

Your course instructor takes academic integrity seriously (because in science, it can have serious consequences for many people). If you have questions about how to conduct yourself when completing course assessments, you should contact your course instructor for guidance.

 

Specific Assignment Instructions:

 

1. Your student number has nine digits: 123456789. Replace the numbers that are bolded and highlighted in yellow with the corresponding value from your student number. For example, if your student number is 009820864, then:

 

0.123 mol/L = 0.009 mol/L

0.456 mol/L = 0.820 mol/L

7.89 x 10² mL = 8.64 x 10² mL

 

Failure to replace the bold and highlighted values with values from your student number will result in a grade of zero on the problem.

 

2. You are expected to identify at least four problem solving strategies used in arriving at your answer. The in-class problems from September 18 can be used as an example.

 

3. Course learning outcomes can be found at the end of your syllabus.

 

4. At the end of your assignment, you must rewrite and sign the Academic Integrity Pledge.

 

Due Date: Tuesday, Sept. 22 at 11:59pm, in the folder on Gradescope that corresponds to your version of the assignment.

 

Value: 6.5% of your final grade

 

 

Q1) When yttrium(III) nitrate reacts with ammonium sulfide in water, yttrium(III) sulfide and ammonium nitrate are produced.

1. Write the balanced molecular reaction. Include phases.
2. If 4.56 g of yttrium(III) nitrate are reacted with 6.78 g of ammonium sulfide, what mass of precipitate is formed? Show full work (all numbers must have associated units).
3. Yttrium(III) nitrate costs $1.68 per gram, and ammonium sulfide costs $0.32 per gram. Assuming that the excess mass could not be recycled, what is the cost of wasted starting material, if any?

?

Your student number
Problem solving strategy	Problem solving
State one learning outcome achieved from this activity.

4 points                                                                                                           Insert extra pages if required.

Q2) A student dissolved 7.89 g of calcium acetate in enough water to make 1.00 L of stock solution. The student took 25.0 mL of the stock solution and then diluted it with water to give 5.00 x 10² mL of a final solution. How many grams of acetate ions are there in the final solution??

?

Your student number
Problem solving strategy	Problem solving
State one learning outcome achieved from this activity.

2.5 points                                                                                                        Insert extra pages if required.

 

Integrity Pledge

“I affirm that I have not given or received any unauthorized help on this assignment, and that this work is my own.”

Rewrite the above statement in the following box and then sign and date below.

 

 

 

__________________________________________                                    _______________________

Signature                                                                                                         Date