STUDY GUIDE ANSWERS The Earth’s History Section 14-2 REVIEW VOCABULARY REVIEW radioactive isotope is an isotope whose nucleus tends to release particles‚ radiant energy‚ or both; radioactive dating is a technique for determining the age of a material by measuring the amount of a particular radioactive isotope the material contains. radioactive decay is the release of particles‚ radiant energy‚ or both by a radioactive isotope half-life is the time it takes for one-half of any size
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Causes and Effects of Air Pollution. Earth is everybody’s home and nobody likes to live in a dirty home. Of all the changes swirling among us‚ those that affect the natural environment seems to hold the most serious implication for human life. From a long period of time‚ people have been polluting the earth surface‚ but because of earth’s own ability to absorb and purify minor quantities of pollutants‚ the problem has been minimal. It is significant
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of such displays. There are two main classes of fireworks‚ force-and-spark and flame. In force and spark compositions‚ potassium nitrate‚ sulfur‚ and finely ground charcoal are used‚ with additional ingredients that produce various types of sparks. In flame compositions‚ such as the stars that shoot out of rockets‚ potassium nitrate‚ salts of antimony‚ and sulfur maybe be used. For colored fire‚ potassium chlorate or potassium perchlorate is combined with a metal salt that determines the color.
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Nuclear Power‚ Friend or Foe? Its seems that the world is in a constant search of a cleaner‚ cheaper and safer power plants. Nuclear energy has emerged as a new alternative for power. The first nuclear power plant was built in the 1950’s and is now used all over the world. France receives 80% of their electrical energy from nuclear power plants‚ however; here in the U.S. we only receive 19% of our electrical energy from nuclear power plants. Whereas nuclear power comes with cons‚ such as safety
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Engineering Materials Week 10 14.4 (a) Compute the repeat molecular weight of polypropylene. (b) Compute the number average molecular weight for a polypropylene for which the degree of polymerization is 15‚000. 14.10 Using the definitions for total chain molecule length L and average chain end-to-end distance r‚ for a linear polytetrafluroethylene determine: (a) the number average molecular weight for L=2000 nm. (b) the number–average molecular weight for r=15 nm. 14.19 (a) Determine the
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There has always been a history of stereotypes surrounding what kind of car you drive. If you drive a small‚ fuel efficient‚ gasoline powered vehicle you can be considered environmentally considerate and practical when it comes to cost savings on gas; whereas driving a diesel-powered truck shows that you do not care about environment with your smoky‚ loud engine and you can usually be found at a gas station fueling up. However‚ are the stereotypes correct? With advancement in clean diesel technology
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– AP Biology – Chapters 2-5 Chapter 2 1. CHNOPS are the six most crucial elements in most macromolecules. Name them. Carbon‚ Hydrogen‚ Nitrogen‚ Oxygen‚ Phosphorous‚ Sulfur. 2. Create a chart and state how many bonds each of the CHNOPS elements can form. Carbon | Hydrogen | Nitrogen | Oxygen | Phosphorous | Sulfur | 4 | 1 | 3 | 2 | 3 or 5 | 2 | 3. Create a Venn Diagram to compare and contrast polar covalent bonds‚ nonpolar covalent bonds‚ and ionic bonds. 4. Why is water
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NAME: ANSWER KEY PERIOD: __________ CHAPTER 6 PERIODIC TABLE HOMEWORK/PRACTICE PACKET HW#1 PERIODIC TABLE VOCABULARY Match the correct vocabulary term to each numbered statement. Write the letter of the correct term on the line. Column A a 1. The highest occupied s and p sublevels are partially filled. n 2. The highest occupied s sublevel and a nearby d sublevel contain electrons. m 3. metals having only 2 electrons in the highest occupied energy
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Alternatives to Gasoline in Vehicles One of the most pressing issues in today’s society both climatically and economically is the use of gasoline and fossil fuels in our vehicles. Ever since the creation of the automobile in the early 1900s gasoline has become a commodity that helps the global economy tremendously. However‚ after over one hundred years of the use the resource has come to be scarcer‚ and all of the greenhouse gases and pollution that were released have helped set in motion the
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THIS IS A LEGACY SPECIFICATION H Thursday 26 January 2012 – Morning GCSE GATEWAY SCIENCE ADDITIONAL SCIENCE B B623/02 Unit 1 Modules B3 C3 P3 (Higher Tier) * B 6 2 0 7 6 0 1 1 2 * Candidates answer on the Question Paper. A calculator may be used for this paper. Duration: 1 hour OCR supplied materials: None Other materials required: • Pencil • Ruler (cm/mm) * B 6 2 3 0 2 * INSTRUCTIONS TO CANDIDATES • • • • • • Write your name‚ centre number
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