Lab #1 (16th October‚ 2012) Safety in the Microbiology Lab * Clinical specimens received from patients pose a hazard to personnel health because of the infectious agents they may contain. * Spurred by the spread of HIV/AIDS‚ the CDC has recommended safety precautions concerning the handling of patient materials by health care workers. * Universal precaution (or blood and body fluid precaution). * Emphasis on good knowledge and common sense. * Safety is everybody’s business
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Oumou Fofana Period: 1 Mrs. Furlong December 19‚ 2012 Gummy Bear Lab Question- If the percent of the concentration of a solution varies‚ will the amount of water gained or lost vary in a linear fashion? Hypothesis- If the concentration of a solution varies‚ then the amount of water lost or gain will not vary in a linear fashion Prediction- I think that the amount of water lost will not vary in a linear fashion. I think the water will vary like one gummy bear would lose 4 grams while
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Module One: Grade Nine Topics Physical Change: This is a usually reversible change in which the form of matter is altered‚ but is not chemically changed to another substance. Melting an ice cube is an example of a physical change. The ice cube changes states: from a solid to a liquid (water). You can physically see this change. No new substance is formed: the matter in the liquid is the same as it was in the ice cube. It is reversible: you can freeze the liquid to turn it back to ice.
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Vocab: 2.1 Mass: Measure of amount of matter in an object Volume: Measure of space occupied by object Extensive property: property that depends on amount of matter in a sample i.e.: mass and volume Intensive property: Property that depends on the type of matter in a sample(not amount) i.e.: type of basketball (leather; inside‚ rubber; outside) Substance: Matter that has a uniform and definite composition Physical property: Quality or condition of a substance that can be observed without
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Mid-YEAR EXAMINATION REVIEW PACKAGE * Everything around us is considered matter. Everything with a mass and a volume is considered matter. * All matter is made of small invisible particles called atoms. * There are 92 different types of atoms in the universe. * Substances that are made up of one type of atom are called pure elements; therefore there are 92 pure elements in the universe. * Substances made up of more than one type of atom are called mixtures. * Mixtures
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Chemistry Atomic Structure: The Electron A myriad of trends occur on the periodic table‚ whether it is defined through the size of the atoms or the first ionization energy that may occur‚ many other trends can be found simply looking horizontally or vertically on to the table. As you look from left to right you can see that the reactivity of the elements increase‚ this is due to the number of electrons increasing on the shell. This also once you go down the table; the shells become further and
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Lesson 03.01: History of the Periodic Table •Explain how scientific observations led to the development of‚ and changes to‚ the periodic table. -Dmitri Mendeleev- first periodic table‚ organized 63 known elements according to properties‚ organized into rows and columns and wrote name‚ mass‚ and chemical properties on each -Julius Lothar Meyer- independently worked in Germany‚ similar to Mendeleev -Henry Gwyn Jeffreys Moseley- Worked with Ernest Rutherford‚ experimented with 38 metals‚ he found
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It makes the real pressure larger so it equals the ideal pressure b – corrects for molecular size. It decreases the volume of the container. * Your extra credit question will have to do with this topic! * Atmospheric Chemistry * 3 types of pollution-very‚ very basic question * 3 types of pollution-very‚ very basic question 1. Hydrocarbon combustion for automobiles 2C8H18 + 2SO2 → 16CO2 + 18 H2O At high temperature‚ nitrogen can also be combusted‚ which
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The half life of 90Sr is 29 years. What fraction of the atoms in a sample of 90Sr would remain 175 years later? Answer 0.166 0.125 0.062 here 0.015 Which relation is not correct? Answer 11p = 11H = proton 0-1e = 0-1β = electron here +10e = +10β= positron 10n = neutron As a result of beta decay‚ the product nucleus is Answer one atomic number lower than the original element. two atomic number higher than the original element
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Module 3 Exam Review ANSWER KEY Multiple Choice 1. Which of the following did Mosley believe?(3.01) a. The elements should be arranged based upon current knowledge of electrons. b. The elements should be arranged based upon the number of neutrons. c. The periodic table should be organized based upon atomic number. d. The periodic table should be organized based upon chemical properties. 2. What is significant about elements in the same group on the periodic table? (3.02) a. They have the
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