chemistry

CHEM 1405 North campus Measurement Lab

Objectives:

1. To design fundamental experiments involving principles of chemistry

2. To exercise Critical Thinking in formulating a conclusion based on evidence

3. To exercise Empirical and Quantitative Skills through application and analysis with numerical data

4. To exercise Visual Communication through understanding and communicating ideas through images or graphs.

5. To exercise Written Communication through the development and expressing ideas in writing and the use of credible sources

6. To exercise Teamwork through positive interactions and quality contributions.

Materials:

· Equipment available in the lab · Glassware available in the lab · Chemicals available in the lab · Unknown

Introduction:

In Chemistry, we work to develop the skills listed in the Objectives. This lab will utilize these skills as well as your knowledge of chemistry and chemical laboratory skills from both Chem 1411 as well as in Chem 1412. You will draw on all of your previous lab experience to perform this lab.

Once you are given the unknown and the question, discuss the problem carefully and outline a reasonable procedure. Do this before you begin your procedures. Please read the teamwork questions below and keep these in mind as you work together. Teamwork is an essential component in the work place and is a skill that you should work to develop.

· Briefly describe your contribution to the group.

· In what way did your contribution help the group determine the unknown by the deadline?

· How did you help or encourage one of your partners?

· How did you foster a positive team climate? Reflect on how you treated your lab partners and how you motivated each other.

· How did you respond to any conflicts with your partners?

In this lab, you will also work on a case study and look up credible sources to help you solve it. The web has many sources but not all are credible. A credible source is one that you can trust. Some examples of credible sources are journal articles by respected and well known scientists, websites from major institutions such as the Mayo Clinic or NASA. The domain ending in .edu is reserved for educational institutions. The .gov domain indicates a government website. These two domains are usually trusted as credible sources. Examples of non-credible sources include (but are not limited to) blogs, unsubstantiated emotional opinions, facebook posts, self-authored websites, websites not from a government sources or without citations. Some considerations when viewing a source is who the author is and if the information is current.

Be careful to check your spelling and grammar in your writing. Once the lab report is complete, upload it to ecampus. North Lake College has a writing lab at the Academic Success Center if need help writing your report. For more information, click on the link Writing Center.

Procedure:

A. Determining Unknown:

1. Work in groups as directed by the instructor.

2. The instructor will present each group with an unknown and a question regarding the unknown.

3. Record the question you are trying to answer about your unknown.

4. Read the teamwork questions on the lab report and keep these in mind as you work together.

5. Working with your group and using the available materials in the lab, outline a procedure to answer the question about the unknown.

6. Show your lab instructor your procedure outline for him/her to OK it before you start.

7. Record your procedure in an orderly step by step manner on your the Report Sheet.

8. Follow your procedure and record any data in the Quantitative Results section of the Report Sheet. Make any needed adjustments to the procedure as you proceed.

9. In the conclusion section of the Report Sheet, answer the question about your unknown, using your results to back up your conclusion. State your conclusion clearly, so that anyone reading your report will understand how you arrived at the conclusion.

WASTE DISPOSAL: Dispose of any unknown in the waste container.

B. Case Study:

10. Work on the case study outside of the lab. You may work with your team.

11. Use the web to gather any needed information. Assess the reliability or credibility of the source and only use credible sources.

12. Cite all sources used.

13. Write your opinion based on the evidence. Check spelling and grammar.

C. Teamwork Assignment:

14. When the lab is completed, reflect on your experience in the group.

15. Answer the teamwork questions at the end of the lab. These questions must be answered individually outside of the lab. Choose two answers for each question. Click a box to select it. Click the box again to unselect.

16. Upload your completed Report Sheet to ecampus before your next lab. Instructions on how to upload your Report Sheet can be found in ecampus.

Experimental Design Lab Report Sheet

Name Alisha Gurung	Date10/20/019	Case Study	/ 25
Partners Sushil Khadka ,		Report	/ 50
Surakshya G.C		Teamwork	/ 25
Bethany Martinez Alex Gonzalea		Total	/ 100

A: Determination of Unknown

Unknown Number: _____09-x_______

Question: what is the heat of neutralization in KJ/Mol of unknown.

CHEM 1412 Experimental Design

Procedures:

North Lake College CHEM 1412 Experimental Design Lab p. 3 Nov 2017

1. First we build the calorimeter using two styroform cup together to make a nest.

2. Then we put the base in the cup and cover with the square cardboard with a hole in the center .

3. In graduated cylinder we measure the unknown acid and pour it into the styroform and measure the initial temperature of unknown acid

4. Then we measure the 20ml of base in the calorimeter and mix with the acid

5. Pour the acid into base in the calorimeter and stir and cover with cardboard

6. After the solution is stable ,record the final temperature

7. Calculate the qsolution = m x SH x ΔT

m = mass of solution

SH = specific heat of solution

ΔT = Tf – Ti

8. Calculate qcalorimeter = C x ∆T

C = the heat capacity of the calorimeter

ΔT = Tf – Ti

9. Calculate qrxn = − (qsolution + qcalorimeter)

10. Calculate ∆H = qrxn / moles H2O

Quantitative Results:

CHEM 1411 Experimental Design

Show all your work with any calculations.

North Lake College CHEM 1412 Experimental Design Lab p. 4 Nov 2017

Ti =23.4 °C.

Tf =29.8 °C.

∆T=6.40°C

qsolution = m x SH x ΔT

=40.0g x4.184 j/g°Cx 6.40 °C

=1.07x10^3 g

qcalorimeter = C x ∆T

=10.0x6.40 °C

=64.0g

qrxn = − (qsolution + qcalorimeter)

=_-(1.07x10^3 g+64.0g )

= -1.13x10^3g

= -1.13x10^3g (1kg/1000)

= -1.13kg

Mol =1.00x0.02

=.02 mol

∆H = qrxn / moles H2O

= -1.13kg/.02 mol

= -56.5 g/mol

CHEM 1411 Experimental Design

Conclusion:

North Lake College CHEM 1411 Measurement Lab p. 4

The heat of neutralization of the unknown acid is -56.5 g/mol.

Using the change in the temperature we calculated the heat absorbed by the soluton and the calorimeter to then calculated the heat evolved in the reaction .we used the heat reaction to calculate the heat of neutralization to be -56.5g/mol.

B: Case Study Question

Society needs energy and nuclear power plants provide some of that energy. What are the pros and cons of nuclear power? Look at the diagram below and write a paragraph explaining which country you think the United States should be the most like. Cite all sources used.

Source: BP Statistical review of world energy. Graphic by Carbon Brief.

C: Self-Evaluation Form for Teamwork Assignment Directions: A team is a group of two or more people who work together for a common goal. For each statement, choose two responses that best describe your experience working in this team. Be honest! Your self-evaluation is only a process to help you see how you are doing and how you might improve your teamwork skills the next time. Contribution to Team Meetings: Describe your contribution during the team assignment. Choose two responses that best describe your experience. ☐ I did not share my ideas in team meetings. (T) ☒ I helped the team move forward with the best plan for the assignment by constructively analyzing all the presented ideas. (S) ☒ I offered a strategy using the ideas of others to complete the assignment. (M) ☐ I shared my ideas in team meetings, and they were accepted by the team. (A) ☐ I shared my ideas in team meetings, but they were not accepted by the team. (E) Facilitates the Contributions of Team Members: Describe your contribution in engaging the team members during the team activity: Choose two responses that best describe your experience. ☒ I encouraged discussions and restated my teammates’ contributions to the team activity. (A) ☐ I engaged my teammates and encouraged them to contribute their ideas toward our goal; I also encouraged non-participating team members to get involved. (S) ☐ I finished my part and waited for my teammates to finish their parts. (T) ☒ I listened to my teammates without interrupting. (E) ☐ I worked to blend the contributions of my teammates into an organized team activity. (M) Individual Contributions Outside of Team Meetings: Describe your contributions to your team when you were preparing for the activity: Choose two responses that best describe your experience. ☒ I carefully read the assignment so that I was familiar with the requirements before coming to the class or team meeting. (A) ☒ I collaborated with my teammates to ensure our assignment was finished on time and met the team’s expectations. (S) ☐ I did not review the assignment before coming to the class or team meeting. (T) ☐ I looked over the assignment but did not work prior to coming to the class or team meeting. (E) ☐ I studied the assignment thoroughly and was very familiar with the expectations for teammates before coming to the class or team meeting. I knew exactly what I was to do. (M) Fosters Constructive Team Climate: Describe the work attitude of your team: Choose two responses that best describe your experience. ☐ Teammates helped each other build a constructive team climate. (A) ☒ Teammates motivated each other by expressing confidence about the importance of the task and the team’s ability to accomplish it. (S) ☒ Teammates treated each other respectfully by being polite in their communication. (E) ☐ Teammates used positive tones and body language to convey a positive attitude about the team and its work. (M) ☐ Teammates worked independently of each other without really working as a team. (T) Responds to Conflict: Sometimes team members disagree with how things should be done. These disagreements are common. How did you respond to any conflicts or disagreements with your partner/team? Choose two responses that best describe your experience. ☐ I agreed with my teammates simply to avoid conflict/disagreements. (E) ☒ I changed the subject to something we both could agree on whenever there were conflicts/disagreements. (A) ☐ I got visibly upset when people disagreed with me. (T) ☐ I identified and acknowledged the conflict/disagreement and listened attentively to my teammate as they explained their position. (M) ☒ I talked through the conflict with my teammate and we resolved the issue in a way that we were both satisfied. (S) Comments: Use this space to share your thoughts about working with this team. It was a wonderful working with my team mates. Once you have completed the Teamwork Self-Evaluation Form, follow your teacher’s instructions to save it and upload it in eCampus.

North Lake College CHEM 1412 Experimental Design Lab p. 7 Nov 2017