Year 11 Module 1 – The Chemical Earth The Earth is made up of a large number of different substances: elements‚ compounds & mixtures We can classify elements & compounds as pure substances. These are always HOMOGENEOUS. Mixtures are not pure substances and can be either homogeneous or HETEROGENEOUS. Pure substances have a fixed composition eg copper metal‚ sulfur‚ carbon dioxide (CO2)‚ methane (CH4). Mixtures have variable composition and can also be separated into its components relatively
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Observations of Chemical Changes Page. 14 Objectives: The objectives of this experiment are: 1. To observe some properties of chemical reactions 2. to associate chemical properties with household products Background Information: Chemical changes are often accompanied by physical changes. Three that you should not see in this lab are changes in temperature‚ presence of a flame‚ and evolution of light‚ as when as firefly glows. Three physical changes that indicate a chemical change may have
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Name : ……………………………………………………………….. Date Due : …………………………………………………………….. Year 12 80% A 70% B AS Level Chemistry 60% C 2008 – 2009 50% D 40% E Below U Questions on % Haloalkanes 2.8 32 1. Chloromethane can be prepared by a reaction between methane and chlorine in the presence of ultraviolet radiation. (i) Outline the mechanism for this reaction. .....................................................................................
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I was assigned was the element Manganese. The symbol for manganese is Mn. It is number 25 on the periodic table. That means it has 25 protons and electrons even on mars or anywhere you go it will have the same protons and electrons. The atomic number would also be 25. It has 30 neutrons also in in the nucleus. The melting point for Manganese would be 1519 K (1246°C or 2275°F). The boiling point would be 1519 K (1246°C or 2275°F) according to http://education.jlab.org/. It also could be 1245.0 °C
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There are many types of chemical reactions‚ five general ones of which I will be describing. Chemical changes are a result of chemical reactions. All chemical reactions involve a change in substances and a change in energy. Neither matter nor energy is created or destroyed in a chemical reaction‚ only changed. There are so many chemical reactions that it is helpful to classify them into 5 general types‚ which include the following: synthesis‚ combustion‚ decomposition‚ single-replacement‚ and double-replacement
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it is recommended sex offenders involuntarily undergo chemical castration which will influence nonviolent society. This effect has the tendency of a non-threatening environment with its extended treatment on sex hormones to reduce the levels of testosterone‚ desires‚ and unwanted fantasies. Depending on the offender’s mental stability‚ they will be released from prison after this method. As members of our community‚ one should ask‚ “Is chemical castration an appropriate punishment for sex offenders
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Case (2) NEW WORLD CHEMICALS INC Financial Forecasting Sue Wilson‚ the new financial manager of New World Chemicals (NWC)‚ a California producer of specialized chemicals for use in fruit orchards‚ must prepare a financial forecast for 1998. NWC ’s 1997 sales were $2 billion‚ and the marketing department is forecasting a 25 percent increase for 1998. Wilson thinks the company was operating at full capacity in 1997‚ but she is not sure about this. The 1997 financial statements‚ plus some other data
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The purpose of the lab was to find out the chemical elements based on the color of the flame that elements make by their reaction. The work we completed in the lab was testing the chemical effects of the flame from the chemicals. We tested different elements and wrote down our observations. I accomplished the knowledge of testing chemicals and making responses based on our observations.Electrons are the particles found in the chemicals that may be responsible for the production of colored light.
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Chemical and Biological Weapons are Your FriendsAs we go on our daily lives‚ terrorists are buying and developing dangerous and hazardous biological and chemical weapons to obliterate us. They do not care who they harm; their mission is to cause terror‚ to spread chaos‚ to engulf the world in anarchy. They want to know that they are making people terminally ill and sick. They will be enjoying a job well done while your skin is covered with excruciating painful blisters‚ or while you tell your loved
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Chemical Reaction: Cold Packs CHM110 Chemical Reaction: Cold Packs Introduction Chemical reactions happen every day in a variety of ways. We will explore the science behind cold packs and the chemical reactions that happen at the molecular level. Furthermore‚ we will examine and explain what chemical bonds are formed‚ broken‚ or both. The product is a simple construct of two bags: one containing water (solvent) and the other a chemical compound called ammonium nitrate (NH4NO3). In order to activate
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