...Chemistry and Society Paper Chemistry is all around from the air we breathe to the water we drink, most people are not thinking of chemicals, but natural substances. Chemistry explains how the properties and behavior of chemicals are composed of atoms and molecules. The agricultural industry uses this knowledge to determine weaknesses and strengths in the crops they grow to determine yields. For instance a farmer may be having a problem growing a certain crop due to a deficiency of a needed element. I work for a company that provides needed elements for this industry. Verdesian Life Sciences provides nutrient based products for farmers. Accuracy and precision are concepts of great value to be successful. The products we provide must be accurate and precise to our claims regarding the guarantee analysis. Accuracy is the degree of closeness to true value based on a single factor or measurement. Precision is the degree to which an instrument or process will repeat the same value based on multiple measurements. Example will be the guaranteed analysis of a product that provides nitrogen, phosphate and potassium. When you test the product you are testing for the accuracy of the claim, however the precision is the result of using the product multiple times. Scientific method is a series of steps to prove a theory based on analysis from an actual experiment. We start with a question and based on our knowledge we form a hypothesis for the best answer. To prove or disapprove the hypothesis...
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...Steven Velasquez Page 1 Chemistry has been around since before time these element have existed since before time. It was only up to us to find each and every one of them. Every element is unique in their own way. Each have different amounts of protons and electrons, have different masses, and are in different states of matter. Sodium, Oxygen, and Carbon each have different components and different ways that they react with other elements. Sodium Sodium is the eleventh element on the periodic table of elements. This means it has 11 protons and 11 electrons. Its symbol is Na and has an atomic weight of 22, 9898. It’s a soft metal, and even though sodium is the sixth most abundant element on earth, it is a very reactive element and is never found free in nature. Sodium was first made pure by Sir Humphry Davy in 1807 by the electrolysis of caustic soda. Sodium is so reactive it can ignite on contact with water forming sodium hydroxide which is highly irritating to skin, eyes, nose and throat. This can cause coughing and sneezing but very intense exposures can result in difficult breathing, and chemical bronchitis. Contact to the skin may cause itching, tingling, and permanent damage due to burns. Contact with eyes may result in permanent loss of sight. So because of this it has to be kept in a moisture free environment. Titanium, sodium peroxide, sodium hydride, and sodamide are produced by sodium. Sodium is also used as coolants for nuclear reactors. Sodium...
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...Kevin Chen Part 3 Ap Chemistry I have completed this assignment on my own. I have not discussed this assignment with anyone except Ms. Chubbuck. I have neither given nor received assistance in completing these tasks. Kevin Chen 1). How to fold filter paper and how to filter a solid from a solution: Gravity Filtration: Select the correct size of filter paper and fold the filter paper into a cone by folding it in half and then again. Place the filter paper in the opening of the Erlenmeyer flask, wet the paper with a little of the solution, and pour the solution. Sources: http://www.chem.ucalgary.ca/courses/351/laboratory/filtration.pdf http://orgchem.colorado.edu/Technique/Procedures/Filtration/Filtration.html http://faculty.sites.uci.edu/chem1l/files/2013/11/RDGfiltration.pdf...
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...Just a few months ago, I was arguing with my mother about how chemistry is pretty much everywhere and no one seems to appreciate it. People do not get curious about how we are always using chemistry. It is like if people give for granted that things are the way they are because it is just the way it is. I have listened to the same phrase over and over again every time that I take a chemistry class, “why should we even have to take chemistry? It is not like I am using it every day!” The truth is chemistry is everywhere. Chemistry is even in the smallest and insignificant things like the glow sticks. How they work? What makes them glow? How is chemistry present in them? Glow sticks have plenty of uses. They are used for camping, diving, as a decoration, or just for fun. The only thing that needs to be done in order to make them glow is bend them. But there is something more deeply than just bending the glow stick. These glow sticks involve chemical reactions. The reaction of these chemicals causes a constant release of energy. Atoms in the materials are stimulated, causing electrons to get a higher energy level and then return to their normal levels. When they do this, they release energy as light. This process is better known as chemiluminesence (Harris, 2015). Moreover, light emitting...
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...Chemistry notes 1. To evaluate the glucose content in a urine sample you have to first place 2 mL of each urine sample in separate labeled test tubes. After doing this, you need to add 2 mL of Benedicts solution, noting the colors of the solutions before placing them in a heat bath and wait for the color change. If the solution turns brick red, it has a high glucose reading. If it’s a blue-greenish color, then there is little to no glucose concentration. B. If the solution turns olive green, then the glucose reading would be +2, with a 1.0 glucose concentration. 2. B. Based off the grapy, the concentration of the unknown would be 0.221. 3. To find albumin (protein) in a urine sample, you to have to measure 3 mL of each 8*of the urine sample in separate in separate labeled test tubes. Add 3mL of Biuret solution to each test tube and observe the color change. B. If you get a purplish/ pinkish-violet color then that means its positive for protein. 4. Mass of Aspirin : Mass of Filter paper + aspirin = 1.40- Mass of filter paper = 1.14 = Mass of Aspirin = 0.26 grams B. Mass of salicylic acid : 0.42 * 1 / 138.12 = .00304 moles salicylic acid Mass of acetic anhydride : 0.70 * 1.08= .756 g acetic anhydride .00304 moles salicylic acid x (1 mole aspirin) / (1 mole salicylic acid) = .00304 moles aspirin .756 moles acetic anhydride x (1 mole aspirin) / (1 mole acetic anhydride) = .756 moles aspirin The Limiting Reactant would be the salicylic acid. Theoretical...
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...Chemistry and Society Paper Johnathan Sutton CHM/110 15 May 2012 Jennifer Cruz Chemistry and Society Paper “In the field of science accuracy is the form of measurement that calculates the degree of closeness of a quality to its true value. Precision is a unit of measurement that is also referred as the ability to reproduce the same results multiple times” (Taylor, 1997). The differences are within the definitions, it all depends on what you are looking for within the results of a test for the proper use of these two units of measurements. Society depends on the accuracy and precision of measurements for products sold by the retail industry, such as a gallon of gasoline, a bushel of corn, or a liter of bottled water. These measurements have to be precise and accurate when it this relates to how farmers sell their products such as wheat, corn, milk, peanuts, and cotton, by weight and or in a bulk sale. Like food products gasoline, water, oil, and several other liquid goods are sold in quantity and if the measurements are not accurately sold per gallon then the United States government will not retain a profit from the barrel of gasoline, water, oil, and several other liquid goods that are purchased from other countries. I would have to say that this really is about supply and demand and the ability to generate a profit from the accuracy and precision of the weight and how much to sell an item for in most situations. Other ways society...
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...Chemistry in Society CHM/110 July 23, 2012 Chemistry in Society The differences between accuracy and precision “In the field of science accuracy is the form of measurement that calculates the degree of closeness of a quality to its true value. Precision is a unit of measurement that is also referred as the ability to reproduce the same results multiple times” (Taylor, 1997). The differences are within the description, it all depends on what you are looking for within the results of a test for the proper use of these two units of measurements. Society depends upon the accuracy and precision of measurements for products sold by the retail industry Today’s society depends on the accuracy and precision of measurements for products sold by the retail industry, such as a gallon of gasoline, the weight of potato’s , or a gallon of oil. These measurements have to be precise and accurate when it relates to how farmers sell their products such as tomatoes, soybeans, milk, peanuts, and cotton, by weight and or in a bulk sale. Like food products gasoline, water, oil, and several other liquid goods sold in quantity and if the measurements not accurately sold per gallon, then the United States government will not retain a profit from the barrel of oil, water, E-85, and several other liquid goods that purchased from other countries. I would have to say that this really is about supply and demand and the ability to generate a profit from the accuracy and precision of the weight...
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...|Course Syllabus | | |College of Natural Sciences | | |CHM/110 Version 3 | | |Introductory Chemistry | Copyright © 2010, 2007 by University of Phoenix. All rights reserved. Course Description This course will examine the basic principles of chemistry conceptually and specifically. The course will apply chemical concepts to address relevant issues ranging from atomic structure and chemical reactions to organic and biological chemistry. The course topics include matter and energy, chemical bonding, intermolecular forces, chemical equilibrium, and nuclear, organic, and biological chemistry. Students will apply these concepts using practical examples, facilitated discussions, and experiments conducted through a virtual laboratory. Policies Faculty and students/learners will be held responsible for understanding and adhering to all policies contained within the following two documents: • University policies: You must be logged into the student website to view this document. • Instructor policies: This document is posted in the Course Materials...
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...Certificate of Education Chemistry 5421 CHM2 Foundation Physical and Inorganic Chemistry Mark Scheme 2006 examination - June series Mark schemes are prepared by the Principal Examiner and considered, together with the relevant questions, by a panel of subject teachers. This mark scheme includes any amendments made at the standardisation meeting attended by all examiners and is the scheme which was used by them in this examination. The standardisation meeting ensures that the mark scheme covers the candidates’ responses to questions and that every examiner understands and applies it in the same correct way. As preparation for the standardisation meeting each examiner analyses a number of candidates’ scripts: alternative answers not already covered by the mark scheme are discussed at the meeting and legislated for. If, after this meeting, examiners encounter unusual answers which have not been discussed at the meeting they are required to refer these to the Principal Examiner. It must be stressed that a mark scheme is a working document, in many cases further developed and expanded on the basis of candidates’ reactions to a particular paper. Assumptions about future mark schemes on the basis of one year’s document should be avoided; whilst the guiding principles of assessment remain constant, details will change, depending on the content of a particular examination paper. Copyright © 2006 AQA and its licensors. All rights reserved Chemistry, CHM2 – AQA AS, Mark Scheme...
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...“Chemistry is a science that deals with the composition, structure, and properties of substances and with the transformations that they undergo” (Merriam-Webster. 2011). Thus saying, Chemistry is a major influence on our lives on a daily basis. You find it by the air that you breathe in, the food that you eat, and every object that you can see or touch is a fundamental of Chemistry. Throughout this paper, I will describe why chemistry is important, what is beneficial, and what I found interesting. In order for me to purse my degree in Chemical Engineering, it was a must for me to take Chemistry 1411. First, it was a pre-requisite for the following Chemistry classes for me to take. Second, the basis of this class is a fundamental pertaining to my degree because they have to apply the principles of chemistry to design and operation of immense chemical manufacturing process. I chose this major because my grandfather inspired me from such a young age to be in this field. I can remember him doing all kinds of experiments in his office trying to test and discover things that really drew my interest to this major. My grandfather demonstrated the benefits of Chemistry and showed me how it is ever present in our every day life. He also taught me that Chemistry is always changing in our world around us and I want to be apart of this changing process and help the world benefit from Chemistry. I hope to see myself in a couple years being highly successful and enjoying working for a refinery...
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...Introductory Chemistry Introduction Instructor: Dr. Tao Tao Course Section: CHEM1405.6013-6014 Meeting Time: TTh 6:00pm-9:10pm Bldg 13-629 Office Hours: TTh 5:30 pm-6:00 pm Contact: tao.tao@lonestar.edu Introductory Chemistry 2 Course Material Requirements • Textbook – Introductory Chemistry, by Nivaldo J. Tro 5th edition • Chapters 1-4, 6-10, 14 • Sections, 5.6-5.10, 12.4-12.8, 13.6-13.8 • 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...
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...each of the three days. 2 Discussion Questions Respond to weekly discussion questions. DQ1:Wed DQ2:Sat 2 Nongraded Activities and Preparation Complete the Equation Editor tutorial and Virtual ChemLab Tutorial located on your student website. Individual Text Exercises, Part I Resources: Equation Editor tutorial Prepare written answers to the following assignments from Introductory Chemistry: • Exercise 20 in Ch. 1 • Exercise 120 in Ch. 2 • Exercise 112 in Ch. 3 • Exercise 120 in Ch. 4 • Exercise 100 in Ch. 5 • Exercise 126 in Ch. 6 • Exercise 116 in Ch. 7 • Exercise 100 in Ch. 8 Submit the assignment, as directed by your facilitator. Friday 5 Individual Virtual ChemLab Assignment 2-4 Access and view the Virtual ChemLab Tutorial, located on the student website. Complete 2-4: Precipitation Reactions from Virtual ChemLab: General Chemistry Laboratories, located on the student website. Note. To complete the assignment, the Virtual ChemLab software must be installed on your computer and must be used in conjunction with Virtual ChemLab: General Chemistry Laboratories. Installation requirements and instructions may be found in the workbook and on the accompanying CD. Once the software is installed, an electronic workbook may be found corresponding with your workbook, which contains preset lab assignments that match the workbook assignments. Use these preset assignments when working on your workbook assignments, as the appropriate laboratory will...
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...Assignment in Physics... 1. Definition of Science, Major branches of science 2. Scientific Method 3. Definition of Physics and its major branches 4. Notable Physicist and their contribution 5. Importance of Physics in our everyday life and in our society. (Write the references) Short bond paper, written or computerized (font: Times New Roman/font size: 12) Reading assign. Measurement Diff. system of measurement fundamentals and derive quantities scientific notation rules in significant figures conversion of units http://www.hep.man.ac.uk/babarph/babarphysics/physicists.html ) I.1 Science The intellectual and practical activity encompassing the systematic study of the structure and behaviour of the physical and natural world through observation and experiment. I.2 The Branches of Science The Physical Sciences * Physics: The study of matter and energy and the interactions between them. Physicists study such subjects as gravity, light, and time. Albert Einstein, a famous physicist, developed the Theory of Relativity. * Chemistry: The science that deals with the composition, properties, reactions, and the structure of matter. The chemist Louis Pasteur, for example, discovered pasteurization, which is the process of heating liquids such as milk and orange juice to kill harmful germs. * Astronomy: The study of the universe beyond the Earth's atmosphere. The Earth Sciences * Geology: The science of the origin, history, and structure...
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...ST ANDREW’S JUNIOR COLLEGE JC 2 Preliminary Examination CHEMISTRY Higher 2 Paper 3 Free Response Candidates answer on separate paper. Additional Materials: Answer paper, Graph Paper, Data Booklet 9647/03 13 September 2010 2 hours READ THESE INSTRUCTIONS FIRST Write your name and civics group on all the work you hand in. Write in dark blue or black pen on both sides of the paper. You may use a soft pencil for any diagrams, graphs or rough working. Do not use staples, paper clips, highlighters, glue or correction fluid. Answer any four questions. A Data Booklet is provided. You are reminded of the need for good English and clear presentation in your answers. The number of marks is given in brackets [ ] at the end of each question or part question. At the end of the examination, fasten all your work securely together. 2 This question paper consists of 10 printed pages. SAJC 2010 P3 – Answer any four questions. 1 (a) Hydrolysis of a lipid (containing multiple ester linkages) produced the following fatty acids. Structure I Structure II CH3(CH2)4CH=CHCH2CH=CH(CH2)7COOH CH3CH2CH=CHCH2CH=CHCH2CH=CH(CH2)7COOH (i) In an experiment, hot acidified potassium manganate(VII) was used to oxidise Structure I. Write the structural formulae of all organic products formed during the oxidation. (ii) What is meant by the term cis-trans isomerism? How many cis-trans isomers are present in Structure I? Draw any 2 possible cis-trans isomers. (iii) State the physical state of this lipid...
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...Syllabus |Discipline Prefix: CHM |Course Number: 111 |Course Title: College Chemistry I | | |Course Section: D04B | | |Credit Hours: 4 |Lecture Hours: 3 |Clinical Hours: |Lab Hours: 3 | |Contact Hours: 6 |Studio Hours: N/A |Semester: Fall | |Meeting Days/Time/Location: Fridays/1:30pm-4:20pm/Science Building | Instructor Information Name: Dr. Shahin Maaref Office Location: JD-30 Office Hours: TRF 9:00am-11:00am, TR 4:30pm-5:30pm & by appointment Contact Information: 822-7692 Blackboard site: http://learn.vccs.edu Instructor email address: smaaref@tcc.edu Course Information Course Description Explores the fundamental laws, theories, and mathematical concepts of chemistry. Designed primarily for science and engineering majors. Requires a strong background in mathematics. Part I of II. Prerequisites and/or Co-requisites Prequisites - None Corequisites – None It is recommended to have H.S. chemistry or CHM01 as prerequisites and MTH 03 or MTE 06 level or higher. General Education Core Competencies Supported...
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