CHEM1100 Lab Manual PDF

Preview

Summary

Lab Manual...

Description

School of Chemistry & Molecular Biosciences, Faculty of Science

LABORATORY NOTES

CHEM1100 Chemistry 1 Semester 1, 2021      

 

Name:

_____________ ________________________

Student Number:

______________________________________



scmb.uq.edu.au

Laboratory Arrangements

LA-1

CHEM1100 Practical Course Contents: Laboratory Arrangements Laboratory Safety Rules Laboratory Techniques Experimental procedures 1-5

List of Experiments EXPERIMENT 1: LIGHTEN UP, RYDBERG EXPERIMENT 2: YOU ARE CORDIALLY INVITED EXPERIMENT 3: MAY THE FORCES BE WITH YOU EXPERIMENT 4: NRG with MgO EXPERIMENT 5: REACHING THE END POINT You will start from experiment 1 and complete all the experiments in order: Experiment

Week

Date (log into your schedule to find this)

Introduction 1 2 3 4 5

First Practical Session Experiment # Date Session Time Name of Demonstrator

©University of Queensland, 2021

Laboratory Arrangements

LA-2

Welcome to the laboratory component of CHEM1100! In this booklet you are provided with both the instructions and rules for participation in this laboratory course and a complete set of notes for five experiments. The aim of this component of your course is to provide you with experiences where you can develop practical skills such as the handling and manipulation of chemicals and apparatus, the use of instrumentation and an awareness of occupational health and safety requirements which are part of the professional practice of a chemist and scientist. You will also develop your analytical skills as you make judgements based on your scientific observations and process your data. The experiments in this laboratory course do not depend on prior delivery of material in lectures. Any theory necessary for understanding the experiment is included in the notes. Where appropriate, the notes may also direct you to textbooks or Labskills multimedia software for additional support. There is no statistical difference in the results between groups based on the timing of the lab session within the fortnight a lab is running. There are five steps that you are expected to complete towards achieving successful outcomes for this component of your course. # # # # #

Carefully read the rules and instructions in the following pages before attending your first practical session. Complete the preparation required for each experiment before you attend each practical session. Take note of the information that your demonstrator provides during each session. Make sure you have your demonstrator’s signature on completion of the experiment. Complete any post-lab work in a timely manner.

Contact for CHEM1100 Laboratory Teaching Team Email: [email protected] This email address is to be used for all CHEM1100 enquiries and is monitored by the course coordinator, Prof Gwen Lawrie, and the people listed below. Dr Andrew Allsebrook and Dr Janina Ladwig (Room: 68-404 and Lab: 68-220) Phone: 3365 4628 (Office), 3365 4876 (Lab) Ms Lucy Holyoak Phone: 3365 56190 Dr Philip Sharpe (Room: 68-406) Phone: 3365 9149 IMPORTANT LINKS: Blackboard: https://learn.uq.edu.au/ - Click on CHEM1100. Your personal timetable: log onto CHEM1100 Blackboard site. Click on “Labs” on the left. Click on “Log in to your Personal Laboratory timetable & results”. Log in with student username and password to view your laboratory practical dates, times and Experiment number. Library: http://www.library.uq.edu.au

©University of Queensland, 2021

Laboratory Arrangements

LA-3

You are required to pass the ‘U/G Student Lab Safety Induction Assessment’ (see Blackboard under Training Courses: UQ Workplace Inductions and OHS Training) before commencing any practical work. This only needs to be done once during your time as an undergraduate. Instructions for finding and completing this Induction are below: 1. On the 'Welcome' page of Blackboard under 'Training Courses', click 'UQ Workplace Inductions and OHS Training'. 2. Click the yellow 'U/G Lab Students' button on the left-hand side menu. 3. Click on, and read the 'U/G Lab Safety Induction Module'. 4. Once you have read the module click on 'U/G Student Lab Safety Induction - Assessment' and complete the 20 question quiz. 5. You must pass the quiz before your first experiment, you will not be able to commence practical work without passing the quiz.

COMPULSORY Lab Coat

Prelab Questions Submitted on Blackboard

©University of Queensland, 2021

Safety Glasses or Goggles

Fully Enclosed Shoes

Laboratory Arrangements

©University of Queensland, 2021

LA-4

Laboratory Arrangements

LA-5

FIRST LEVEL CHEMISTRY LABORATORY ARRANGEMENTS Organisation 1. Students are assigned to groups before attending their first laboratory session. Once you have been assigned a group you must remain in it. If there is need to change then you must negotiate this with the First Level Laboratory staff (email: [email protected]). 2. At your first laboratory session, a demonstrator will brief you on laboratory arrangements and rules, health and safety requirements, and assessment procedures. Student Responsibility 3. Before starting an experiment, you need to be prepared. Read the instructions and plan your experiment. You are required to do some on-line research to obtain information related to the experiment, and to answer some questions (“Pre-lab questions”) and complete a flow chart prior to coming to the laboratory. 4. Assessment procedures are designed so that a student who makes an honest and careful attempt at the experiment and is willing to learn will score at least 15 out of 25 for Experiments 2 – 5. Further details about assessment can be found on page 9 of this section. You should therefore concentrate on learning. To obtain a high score (20+) for an experiment, you will need to answer the pre-lab questions correctly, and you will need to carry out the experiment carefully so that you obtain satisfactory experimental results. Preparation before you come to the laboratory is the key in both cases. Apparatus 5. General apparatus such as beakers, flasks, test tubes etc. are kept in containers on the bench or trolley drawers at the site of the experiment. Any breakages should be reported to the demonstrator who will arrange for their replacement. There is no penalty for this; we need to ensure that sufficient supplies are always available for students. 6. More specialised equipment is provided for general use (e.g. balances and burettes) or for particular experiments (e.g. spectrophotometers). This equipment is often expensive and delicate: great care must be exercised in its use. Breakages and/or malfunctions must be reported immediately to the demonstrator. 7. Students are responsible for cleaning and tidying bench areas before they leave the laboratory. All apparatus should be cleaned and returned to its proper place.

©University of Queensland, 2021

Laboratory Arrangements

LA-6 SUBMITTING YOUR OWN WORK

In the laboratory you will work in pairs, which is excellent for developing teamwork, collaborative working and negotiation skills. However, it is important that you submit your own work so that your ability and skills can be assessed. This includes working on your own Excel file when you are required to submit a graph, completing the results section with your own working and developing your own answers for analysis questions. USE OF THE INTERNET and HOMEWORK WEBSITES There is a huge amount of information available on the internet and there are occasions when we will ask you to use reputable websites to search for information. There are also a number of websites that are not appropriate sources of information, including Yahoo Answers and homework websites such as Jiskha.com that should be avoided. Placing questions from the Pre-Lab quiz or the Lab Manual on such sites, or copying an answer from a posted question is not permitted and is considered Poor Academic Practice. Below is an example of a question uploaded onto a homework site:

On most occasions we are able to trace the source of the upload. If you are stuck on any Pre-lab quiz question, please come to the lab in plenty of time before your timetabled lab session and we can help you work out the answer.

Important Library Links The library, its website, and the academic librarians, are an excellent set of resources. Each school has a subject specific academic librarian to help you. Library Homepage https://www.library.uq.edu.au/ To find useful chemistry information resources - including textbooks, physical properties and spectra Chemistry Subject Guide http://guides.library.uq.edu.au/chem To find Course Reading Lists Go to the Library homepage https://www.library.uq.edu.au/ In the first search box, change Library to Course Readings Lists Enter your subject code (e.g. CHEM1100) To find Past Exam Papers Go to the Library homepage https://www.library.uq.edu.au/ In the first search box, change Library to Past Exam Papers Enter your subject code (e.g. CHEM1100)

©University of Queensland, 2021

Plagiarism Information Plagiarism occurs whenever you present someone else's work as your own without acknowledgement, and is defined by the University (PPL. 3.60.04, Student Integrity and Misconduct) as follows: "The act of misrepresenting as one's own original work the ideas, interpretations, words or creative works of another either intentionally or unintentionally. These include published and unpublished documents, data, results, images … and ideas gained through working in a group. These ideas, interpretations, words or works may be found in print and/or electronic media.” The following practices constitute acts of plagiarism and are a major infringement of the University’s academic values: •

Where paragraphs, sentences, a single sentence or significant parts of a sentence are copied directly, and are not enclosed in quotation marks and appropriately footnoted;

•

Where direct quotations are not used, but are paraphrased or summarised, and the source of the material is not acknowledged either by footnoting or other simple reference within the text of the paper; and

•

Where an idea which appears elsewhere in printed, electronic or audio-visual material is used or developed without reference being made to the author or the source of that material.

If you feel that you don’t completely understand this issue or the possible impact it may have on your assessment, then please approach the course convener for clarification. You should also complete the UQ online academic integrity tutorial available for all students: https://www.uq.edu.au/integrity/ We take the issue of plagiarism VERY seriously so it is important that you are fully aware of what is meant by this term.

How to avoid plagiarism in your academic writing We encourage students to work together in groups when recording and processing data: good team work is important for good science, and discussions with colleagues will help you to identify and solve problems as well as assist the learning process. However, you MUST acknowledge the names of co-worker(s) on all plots, Tables, etc. prepared with their assistance. You should ALWAYS write answers to questions IN YOUR OWN WORDS; where words from other sources (e.g. lab manual) are unavoidable, they should be enclosed in quotation marks and the source acknowledged. You should NOT copy answers directly from another student's report - your ability to improve your communication skills will be diminished if you do not make an effort yourself!

When marking your reports or laboratory books, if your tutor finds two or more reports with answers in the same wording then it will be reported to the School Chief Integrity Officer for investigation.

School of Chemistry and Molecular Biosciences | Plagiarism Information Updated 3.1.20

1

Some helpful ‘rules’: To avoid plagiarism, you must give credit whenever you: •

quote from someone’s actual spoken or written words

•

use another person’s ideas, opinions, or theories in an assignment or essay

•

make use of pieces of information, such as statistics, graphs, drawings, that are not common knowledge

•

paraphrase another person’s spoken or written words

How can you avoid unintentional plagiarism? •

Use quotation marks around everything that comes directly from a text or article

•

Try to summarise ideas and arguments in your own words – don’t just rearrange a few words here and there

•

Check that you have correctly paraphrased the original ideas

•

Check your summary against the original text

School of Chemistry and Molecular Biosciences | Plagiarism Information Updated 3.1.20

2

Laboratory Arrangements

LA-8

Assessment Pre-Lab quizzes The pre-lab quiz for each experiment will be completed on-line. They can be accessed via Blackboard (CHEM1100/Laboratory). The quizzes will be released in the two weeks before each experiment and will have a mix of questions to help you to prepare for the upcoming laboratory session. The quiz is not timed but must be submitted at least 30 minutes before your attendance at the laboratory, you will not be able to complete the experiment if you have not completed the pre-lab quiz. You can go in and out of the quiz any time until it has been finally submitted. If you have any questions about the quiz, either email chem1100@[email protected] or come to the lab at any time and we can help. Remember to allow yourself sufficient time to complete the quiz and prepare for the laboratory session. Post-Lab reporting You will complete all results and analysis on line for Experiments 1, 2, 3 and 5 (though Experiment 1 is formative and Flexible Delivery students will complete a Lab Report for Experiment 4). The style of questions is similar to that in the pre-lab quiz, except this time you will be using your own results. You will have 24 hours after leaving the laboratory to submit your work (usual late penalties as described in the ECP will apply after this time), though it is possible to complete the post-lab quiz before the end of the laboratory session. Do make sure that you have all the information that you need before leaving the laboratory. The advantages of this method of assessment are: • • •

You will receive instant feedback on your work, which will help you to prepare for the next experiment. Having time to reflect on your results should help you to analyse your data thoroughly. You will have more time in the laboratory to develop skills and achieve good results.

The marks for each question are at the top of each page and each report will have an analysis question incorporated. The post-lab quizzes will be opened in the week before each experiment so you will have the opportunity to view the questions and layout before attending the laboratory. The quiz is not timed from when you first open it, but must be completed within 24 hours of completing your laboratory session. If you have any questions about your post-lab quizzes, email [email protected]. In addition, Flexible Delivery students will submit a laboratory report for experiment 4. The marking criteria, an example of a report and submission details will be available on Blackboard. In addition, the Pre-lab quizzes will provide an opportunity to practice different sections of the report. Experiment

Assessment method

Percentage of course grade

1

Formative

0

2

/25

5

3

/25

5

4

/25 (Laboratory report)

10

5

/25

5

©University of Queensland, 2021

Laboratory Arrangements

LA-9

Assessment penalties A 3 mark penalty may be applied for the following (6 marks maximum assessment penalty per experiment): • •

Failure to immediately report an accident or near-miss incident to your demonstrator. Failure to enter chemical safety information into your lab manual.

•

Failure to comply with safety and behavioural rules, including appropriate wearing of PPE.

• Failure to adequately clean up your work area or to return equipment, to appropriate storage areas. 5 marks are deducted if your pre-lab quiz is not submitted at least 30 minutes prior to the start of class. If your pre-lab quiz is not submitted by the time class starts, then you will not be able to do the experiment and will be required to reschedule.

RESCHEDULES: You are required to attend your CHEM1100 laboratory sessions on the day you have been scheduled. Remember, you chose your laboratory session to suit your semester timetable, work and personal commitments. If you do need to reschedule a practical session, consult section 5 of the CHEM1100 ECP for the correct procedure for application to reschedule. You will need to email [email protected] with the required documentation.

LATENESS: The laboratory doors will close at 15 minutes past the commencement time of the laboratory session and you will not be admitted. You may reschedule that practical however, you will receive a 5 mark penalty for that practical. The laboratory component contributes a significant portion of your overall mark for this course and the loss of 5 marks might represent the difference between a passing and failing grade, or be the cause of a lower than expected grade. It is your responsibility to ensure that you allow yourself adequate time to move from a lecture theatre to the laboratory or to travel to the University whether it is by car or public transport. All reschedule requests should be emailed to the CHEM1100 teaching team at least 24 hours in advance of the rescheduled session you wish to attend. The email address is: [email protected].

©University of Queensland, 2021

Laboratory Arrangements

LA-10

How to Prepare for Laboratory Classes Preparing for the Chemistry labs is very important. Understanding what you will need to do in the lab and then how to process the data before your session will enable you to manage your time wisely and focus on the learning objectives set.

1.

One week before - Read the laboratory manual. The first time you read the experiment you should try to get an overall idea of what the experiment is about and what you will be doing. Circle words or concepts that you either had trouble understanding or that you think are very important.

2.

A few days before – a.

b. c. d.

e.

f.

3.

Re-read the lab manual closely and complete your flow chart. When you come to a word or concept that you had circled earlier ask yourself whether you understand that concept now. If you don’t, then you need to consult additional resources. Reading at a University level means reading and understanding. Remember the Laboratory Techniques section in your lab manual contains essential additional information. Your text book will also have information on the techniques being used. Look at the glossary for definitions of words or the index to read about concepts. Look at the Results section for the experiment. Think about what data is to be recorded and what questions are being asked. What calculations will you be doing? For example, can you prepare the equations or calculate molar masses in advance? Read the Marking criteria. Understand what ...