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Homework answers / question archive / CH110/120 Assignment #2 Version A General Instructions   Due Date: September 29, 2020, 11:59 pm in the folder on Gradescope that corresponds to your version of the assignment

CH110/120 Assignment #2 Version A General Instructions   Due Date: September 29, 2020, 11:59 pm in the folder on Gradescope that corresponds to your version of the assignment

Chemistry

CH110/120 Assignment #2 Version A General Instructions

 

Due Date: September 29, 2020, 11:59 pm in the folder on Gradescope that corresponds to your version of the assignment.

 

Late assignments will not be accepted. You cannot submit your assignment by emailing your professor. It is your responsibility to follow the assignment instructions before the due date and time.

 

 

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

 

  1. 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.

 

  1. 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.

 

  1. 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.

 

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

 

  1. 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). 

 

  1. 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.

 

  1. 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.

 

  1. 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.

 

  1. 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 (this means that 1, 2 and 3 refer to the 1st, 2nd, and 3rd digits in your student number)

0.456 mol/L = 0.820 mol/L(this means that 4, 5 and 6 refer to the 4th, 5th, and 6th digits in your student number)

7.89 x 102 mL = 8.64 x 102 mL (this means that 7, 8 and 9 refer to the 7th, 8th, and 9th digits in your student

                                                                                                                                                                     number)

If you do not understand this instruction, email your instructor with your student number and the version of your assignment, and your course instructor with clarify these requirements.

 

  1. For Q1, 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. You are not required to do this for Q2.

 

  1. For Q1 you are required to identify a relevant course learning outcome. These can be found at the end of your syllabus. Please do not make up your own learning outcomes. You are not required to do this for Q2.

 

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

 

 

Value: 6.5% of your final grade

Q1) Boron is isolated from its oxide ore by a two-step industrial process. Step one is the reaction of B2O3(s) with charcoal (C(s)) and chlorine gas, as follows:

B2O3(s) + C(s) + Cl2(g) à BCl3(l) + CO(g)

(a) Write the balanced molecular reaction. Include phases.

(b) Assume that excess carbon is present. 0.456 g of B2O3 reacts with 7.89 L of Cl2(g) at standard temperature and pressure. The products are collected at 23.2 oC with a pressure of 1.03 bar. What volume of CO(g) is produced?  

(c) If 1.00 L of CO(g) are collected, what is the percent yield for this reaction? State one reason why your percent yield is greater than or less than 100%.

 

Your student number

 

 

Problem solving strategy

Problem solving

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

State one learning outcome achieved from this activity.

 

Q1=4 points                                                                                                    Insert extra pages if required.

 

Q2) (a) How many molecules of CO2 are in a 500.0 mL container at 789 mmHg and 123 oC?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Q2) (b) What is the root-mean-square speed of the particles in in the flask for part (a)?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Q2) (c) Using NH3, B2F4, C3H6 and He gases fill in the following table based on the provided graph.

(Note that this graph should be considered a generalization. A quantitative representation would have to account for actual temperature and type of gas. It has been adapted from https://chem.libretexts.org/ under a CC BY-NC-SA 3.0 license. If you have difficulty seeing the colours on the graph, contact your course instructor.)

 

 

 

 

 

Curve

Your Gas

One or two sentence justification for your assignment.

A

 

 

 

 

B

 

 

 

C

 

 

 

D

 

 

 

Q2=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

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