...How does a physical or chemical change affect the mass of a substance within a closed system? Our hypothesis to this question was, if a chemical change affects the mass, then the mass will change. Our second hypothesis was, if a physical change occurs, then the mass would stay the same. Changes in matter happen all around us everyday. When we use a coloured pencil, they change in the size of how hard you are pushing on the coloured pencil which dulls it out. When you chew food it, changes its size so we as humans can swallow. Matter is anything that has mass and volume, that can go through chemical and physical changes. When physical change happens, no new substance is created because the molecules of the substance remain the same. As for when...
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...Conservation of mass means in a chemical or physical change, mass can not be created or destroyed,so the mass will always stay the same but only with a closed system. This all relates to the experiments we have done in class. In experiment 2.1 we found out if the mass changed when salt dissolves in water. We found that it did not. This experiment was a physical change because you didn’t create something new.The reactants we had in this experiment were the the water and salt. The products were the dissolved salt and the water. We used a closed system so that we did not get any spillage of any salt or water when we shook the bottle to mix it. In experiment 2.4 we found out that the mass does not change when ice melts. This was a physical change because you can always get the water back to ice, nothing new was created. We only had one reactant which was the ice. We also had one product and that was the water. In this experiment we used a closed system because we did not want any water spilling out of the bottle. That would result in incorrect data....
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...In each part of the investigation, identify the type of change that took place and support it with evidence from your observation table. Test A: A chemical change occurred. I know this because bubbles formed when the two substances mixed. I also know this because a gas was formed, and an indicator of a chemical change is when a new substance forms. Test B: A chemical change occurred. I know this because there was both a production of light, and a production of heat. Also, the change that occurred is irreversible. Test C: A chemical change occurred. I know this because the mixture was opaque, while the copper was translucent before mixing. I also know this because small bubbles formed when the substances were mixed. This is also an irreversible...
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...Why do we keep a lab notebook? In the ‘real world’, you will be expected to record what you do and how you do it, with the data clearly identifiable. There are 2 reasons for this: • Any scientific experiment is only considered valid if it can be repeated by someone else using your notebook. • If you develop a new product or process, your notebook becomes a legal document that can be scrutinized in a court of law, especially in cases of patent infringement. In order to meet these requirements, certain conditions must be met: • Notebooks shall have bound pages, loose-leaf and spiral bound are not acceptable. • All pages must be numbered prior to use. This will show if any pages have been removed that contained data that might compromise interpretation of your conclusions. • All data shall be entered chronologically. Do not leave empty pages to insert information later. If you finish with a large expanse of blank page, put a line through it to show that it will not be used. • All notes are to be made in indelible pen – pencil will be penalized. If you make a mistake, just draw a single line through it, not a childish scribble to hide all traces! • All data will be recorded in your lab notebook at the moment it is generated. No notes shall be written on scraps of paper or memorized for later. Other notes about the lab notebook: All pre-lab and experimental work is hand-written in your lab notebook. Make...
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...Lab Report for Experiment #4 Physical and Chemical Properties and Changes Student's Name __________ __________ Date of Experiment ___ _________ Date Report Submitted _________________ Title: (copy from lab, 1 point) Purpose: (copy from lab, 1 point) Changes to the Procedure by Instructors: 1. Do not test the odor of the samples. 2. In this lab the test tubes can get very dirty and cleaning is difficult. Your test tube may break, but don’t worry about it you will not need them again this term. Dispose carefully in the trash. Have you made any changes to the procedure? Please explain: Fill out the data sheet (page 3) for the experiment and answer the questions. Note: read the lab introduction for clarification on the difference between physical and chemical changes. Remember that a physical change often occurs during a chemical change, but a chemical change does not always happen when a physical change occurs. If you still have questions ask your instructor. From experiment # 1 we learned that a chemical change results in a color change, the formation of bubbles, the formation of a precipitate, or a change of temperature. Keep that in mind when you are deciding whether a physical or chemical change has occurred. Data Table (8 points) Read carefully before you begin your experiment! Be complete when writing your observations. One word observations are not usually complete. If there is a color change, include the color before and after. For...
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... • Scientific Non-programmable Calculator • Safety Goggles for Lab • Lab Coat/Apron (Optional) Introductory Chemistry 3 Evaluation and Grade • Tests: 45%; 4 tests, best of 3, no make-up unless good excuses (documented, in advance notice) • Open-book Quizzes: 10%; best n-2, no make-up • Laboratory: 25% • Final Exam: 20% • Homework: Encouraged but not mandatory • Problem Set: Provides but not mandatory • Final withdrawal day: Nov. 10th, 2014 Introductory Chemistry 4 Lab Report/Grade Guideline • Pre-lab write-up (30%): Complete before lab starts, will be checked and signed for completeness – – – – Title/Date Aim/Purpose Introduction Procedures • Lab Performance and Quality of data (25%): will be checked and signed when leaving lab – Observations – Collect and record data • Post-lab (40%) – Result (Calculations, Graphs, Interpretations etc), – Discussions/Conclusions – Post-lab questions if any • Overall Report Neatness (5%) • Report due one week after the completion of experiment for full credit; after two weeks, no report will be accepted, and no credit will be given; between one week and two weeks, there will be 20% penalty. Introductory Chemistry 5 Lab Report Format 1. Title 2. Date 3. Aim/Purpose 4. Introduction 5. Step-by-step Procedures 6. Observations 7. Collected and recorded data 8. Result (Calculations, Graphs, Interpretations etc), 9. Discussions 10. Conclusions 11. Post-lab questions if any Introductory Chemistry 6...
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...Attendance, P4 Lab Schedule, P4 Lab Replacement, P5 Lab Regulation 6.1 General Rules, P5 6.2 Safety Rules, P6 Lab Rules & Regulations on Computer Usage 7.1 ICT Computer Lab, P7 7.2 ICT Internet Lab, P8 Appendix 1 (Lab Replacement Flow Chart), P10 Appendix 2 (Lab Session Replacement Form), P11 Policy for Laboratory Usage after Office Hours, 10.1 Operating Procedure, P12 10.2 Warnings on liability, P12 10.3 Rules and Regulations, P12 Use of Laboratory After Office Hours 11.1 Appendix 3 (Application Form), P14 11.2 Appendix 4 (Student’s Declaration Form), P15 Ambulance Services, P16 Lab Safety Handbook on Chemical Hazards, Physical Hazards and Biological hazards, P17-P64 7 8 9 10 11 13 14 Universiti Tunku Abdul Rahman 2 Definitions • • • • • Lab Session: Time duration allocated for student to do lab experiment. Lab Sheet: A printed material usually contains a series of instructions and information given to the student on how to conduct lab experiment. Lab Report: A written report prepared by student based on individual observation and data analysis after the lab experiment. The format and requirements are usually stated in the lab sheet. Lab Coordinator: A person in charge of coordinating all the lab sessions of the semester and administrating lab matters. Lab Instructor: An academic staff (lecturer or tutor) in charge of the lab session. The lab instructor will give briefing and instructions to students during the lab session. 1. Introduction Practical lab is one...
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...Chemical Inventory Management System David Acker Auburn University Risk management and Safety Abstract Managing chemical inventories at colleges and universities is one of today’s major challenges for higher education. This is especially true for large, diverse, research-oriented institutions like Auburn University. Knowing what chemicals are on site, their hazard potential, who is responsible for them, and where they are located is essential to maintaining a safe campus. Additionally, Federal and State regulations dealing with hazardous waste, chemical security, and emergency preparedness have become more stringent in recent years, requiring greater accountability from colleges and universities. These safety and regulatory compliance imperatives, along with issues of environmental sustainability and cost containment, drive the need for effective chemical inventory management in the university environment. In order to achieve effective chemical inventory management at Auburn University, Risk Management and Safety (RMS) has implemented a Chemical Inventory Management System (CIMS). The technological core of the CIMS is a chemical tracking database that provides realtime, discreet (to the individual container) monitoring of chemical inventories. The database has the capacity to accurately link the chemical container to hazard data, location, user, and acquisition date. Personnel, equipment, and budgetary resources were required to support the implementation phase, and ongoing...
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... April 19, 2015 Executive Summary Purposes of the Report The purpose of this recommendation report is to identify the underlying causes of academic lab safety and give recommendations on how these safety issues can be resolved so that future accidents can be avoided. The topics discussed in this report will help to determine the appropriate course of actions that need to be taken to ensure that all students and staff whom conduct lab experiments do so with the upmost caution. There is a growing concern for the safety of both staff and students that does not seem to lower the risks that these people are being put in. The importance of proper training and education on lab safety can help to resolve future issues. Academic Lab Safety: Ensuring the Safety of Our Students This research conducted is to help improve the improper management of academic labs by providing safety education and encouraging the correct training on safety. If the requirements of lab safety training are being met, then staff and student safety can be reduce to a minimum. Without the proper safety practices during experiments in the lab, many more students and staff will continue to be hurt and the future of academic labs may cease to exist based on the lack of funding that may or may not be provided to continue to educate students on how experiments and science work. Recommendations The recommendations of this report include: Never conduct experiments in the laboratory alone or perform...
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...Importance Of A Lab Report Lab Report Lab report is one way we used during of after an experiment in a laboratory to subtly record and discuss the experiment. During a lab, we sometimes can observe only the physical part of the experiment, or may be some visible chemical changes. These changes indicate that the experiment we do is successful or not. However, in order to understand and achieve more from just simply doing the experiment, we write lab report to more profoundly understand the internal meanings of the experiment we do, and the eventual purpose of the lab. Doing a lab report are also essential to making corrections for further experiments similar to previously done ones. Pass experiences can help improve and better the new lab in many ways such as the procedure. We can make the procedure clearer and more precise. By doing so, we can do our best to limit the possibility of ingredients that may alternate final results popping up during a lab. Without a precise data and purpose, a lab would not be a lab because it has no means of proving anything that we don’t know of. Too many alternating factors always cause a lab to be useless because we cannot focus on the specific thing we are looking at. Thus, a lab report is essential not just for the lab that the report is for, but essential for bettering future similar experiences. A lab report contains many different parts. One part of the lab report is the analysis of the experiment, which really stands most importantly...
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...Lab Report Lab report is one way we used during of after an experiment in a laboratory to subtly record and discuss the experiment. During a lab, we sometimes can observe only the physical part of the experiment, or may be some visible chemical changes. These changes indicate that the experiment we do is successful or not. However, in order to understand and achieve more from just simply doing the experiment, we write lab report to more profoundly understand the internal meanings of the experiment we do, and the eventual purpose of the lab. Doing a lab report are also essential to making corrections for further experiments similar to previously done ones. Pass experiences can help improve and better the new lab in many ways such as the procedure. We can make the procedure clearer and more precise. By doing so, we can do our best to limit the possibility of ingredients that may alternate final results popping up during a lab. Without a precise data and purpose, a lab would not be a lab because it has no means of proving anything that we don’t know of. Too many alternating factors always cause a lab to be useless because we cannot focus on the specific thing we are looking at. Thus, a lab report is essential not just for the lab that the report is for, but essential for bettering future similar experiences. A lab report contains many different parts. One part of the lab report is the analysis of the experiment, which really stands most importantly to a lab. The analysis part...
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...Lab Manual Introductory Biology (Version 1.4) © 2013 eScience Labs, LLC All rights reserved www.esciencelabs.com • 888.375.5487 2 Table of Contents: Introduc on: Lab 1: Lab 2: Lab 3: Lab 4: The Scien fic Method Wri ng a Lab Report Data Measurement Introduc on to the Microscope Biological Processes: Lab 5: Lab 6: Lab 7: Lab 8: Lab 9: The Chemistry of Life Diffusion Osmosis Respira on Enzymes The Cell: Lab 10: Lab 11: Lab 12: Lab 13: Lab 14: Lab 15: Cell Structure & Func on Mitosis Meiosis DNA & RNA Mendelian Gene cs Popula on Gene cs 3 4 Lab Safety Always follow the instruc ons in your laboratory manual and these general rules: eScience Labs, LLC. designs every kit with safety as our top priority. Nonetheless, these are science kits and contain items which must be handled with care. Safety in the laboratory always comes first! Lab Prepara on • • Please thoroughly read the lab exercise before star ng! If you have any doubt as to what you are supposed to be doing and how to do it safely, please STOP and then: Double-check the manual instruc ons. Check www.esciencelabs.com for updates and ps. Contact us for technical support by phone at 1-888-ESL-Kits (1-888-375-5487) or by email at Help@esciencelabs.com. • Read and understand all labels on chemicals. If you have any ques ons or concerns, refer to the Material Safely Data Sheets (MSDS) available at www.esciencelabs.com. The MSDS lists the dangers, storage requirements, exposure treatment...
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...This lab report identified different types of reactions in various chemical changes. Through the five experiments completed in class, the creation of bubbles indicating a new gas formed, colour change, and production of light were observed. From reactions A and B, it can be concluded that single displacement reactions are indicated when three elements are present, two of which are of like charges that switch places during the chemical reaction. Both reactions involved an element with a negative charge (Cl) and two elements with positive charges (Cu (II) & Al and H & Mg), which then traded places during the reaction. As well, from reactions C and D, it can be concluded that double displacements occur when four elements (or two compounds) are...
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...CH 220C ORGANIC CHEMISTRY LABORATORY Spring, 2015 Section Page 1. General Information 2 2. Safety Information 2 3. Attendance 3 Make-Up Policy 3 4. Laboratory Protocol 3 Assigned Reading 3 Pre-Lab Quizzes 3 Lab Notebook 5 Chemicals 5 Due Dates for Reports 5 5. Orientation 5 In-Lab Information 5 Library Information 5 6. Check-In 6 7. Grading Procedure 6 8. Policy on Cheating 7 9. TA Office Hours 8 10. Faculty Course CoordinatorS 8 11. Course Web Page 8 12. Hints to Minimize Frustration IN ORGANIC CHEMISTRY 8 13. Work Schedule 10 Lab Report Due Date Schedule 10 Experiments 10 14. Supplements 17 A. Extraction of Unknown 17 B. Recrystallization of Unknown Products 18 C. Methyl Benzoate 19 D. Synthesis of Luminol 20 E. Azo Violet 23 1. GENERAL INFORMATION PRE- and CO-REQUISITES Pre- and co-requisites for CH 220C listed in the Course Schedule. Important: Because the lecture and laboratory courses are co-requisites of each other, dropping one of them requires that you drop the other as well, unless the drop occurs during ...
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...Name: Date: Instructor’s Name: Assignment: SCI103 Phase 1 Lab Report Title: Measuring pH Levels Instructions: Enter the Virtual Lab, and conduct the experiments provided before going out into the virtual field for additional research. Please type your answers on this form. When your lab report is complete, submit it to the Submitted Assignments area of the Virtual Classroom. Part I: Answer the following questions while in the Phase 1 lab environment. Section 1: You will be testing 4 known solutions for pH levels using a standard wide-range indicator. Based off of the results obtained in the lab room, fill in the following table: |Solution Number |pH from Lab |Acid, Base or Neutral? |Solution Name (what was in the test tube?) | |Solution 1 |6 |Acid |Pure Water | |Solution 2 |1 |Acid |Lemon Juice | |Solution 3 |12 |Base |Bleach | |Solution 4 |5 |Acid |Coffee | 1. How many drops of wide range indicator will you use for each test, based on industry standards such...
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