Jamie Kanzler Extended Essay: What is the impact of pollution on ozone depletion? Section 1: Introduction Air is classified as a mixture because it is made up of many different elements. These elements include 78% nitrogen, 21% oxygen, 1% Argon, .4% water vapor, and .04% carbon dioxide. Human activity has a very large effect on the air in our environment. Over time, humans have caused the once clean air to become polluted with chemicals. These chemicals are called pollutants. A pollutant is
The Periodic Table Chemically speaking, the periodic table was a major factor in improving the study of elements, in which then the study of these elements expands into broader studies such as atoms and sub-atoms. This essay will talk about the history of the development of the periodic table and will further discuss the how and why it was created. Moreover, it will include the history of various chemists that contributed in the improvement of the table such as Johann Wolfgang Döbereiner, John Newlands
TASK 1A Periodic table essay Also you should organise into F blocks and S, P, D blocks. Which groups and blocks belong too? NA- Sodium K- Potassium CA- Calcium MG- Magnesium C- Carbon O- Oxygen N- Nitrogen F- Fluorine CL- Chorine FE- Iron H- Hydrogen S- Sulphur Groups Group 1= Alkali metals Group 2= Alkaline earth metals Transition metals Group 3 = Boron family Group 4= Carbon family Group 5= Nitrogen family Group 6= Oxygen family Group 7= Halogen family Group 8= Noble gases Rare earth
industries meant mass production of the weapons sufficient to replace the damaged and the lost as well as the vast army. iii. The advancement in science saw the war become sophisticated as each side tried to outwit the other in tact and equipment. A. Chemistry was largely employed to come up with explosives and ammunitions that had superior destructive power. B. New discoveries for instance of the rockets added to the power of the WWI. iv. The improved infrastructure and communication system boosted
INTERNATIONAL SCHOOL SIMPRUG Chemistry Assessment Task Student name : Class : 10 A Due date : 30 August 2010 Teacher : Ms. Merliani “How do chemical elements effect the environment” (1.236 words) Atmospheric pollution Most of the people live within the major cities where the evidence of pollution in the atmosphere can almost be seen daily. Your Task You will need to write an essay (700-1200 words) or prepare a presentation using the following guidelines
Extraction of metals The History of Metals. Metals have been used by people for many thousands of years. Gold and silver, found as native metal, were used both as jewellery and as a status symbol - nothing new there. These metals were known in the Stone Age, but gold and silver are too soft to be used as tools. The first really useful metal to be discovered was bronze. This began the Bronze Age. Bronze was used extensively for tools and weapons in Asia and Africa from 4,500 B.C. (6,500 years
Dashain Vacation Home Assignment-2069 Grade XI, Science Note: Home assignments of each subject should be done in different copies/papers. English 1. Write an essay on ‘Dashain and its significance in Hindu Religion’. 2. Prepare a report on ‘Global Warming, its consequences and solutions’. 3. Write an article on ‘Importance of Media’. 4. Write on ‘English for Global education’. Mathematics 1. Find the angle between the pair of straight lines x2 -2secAxy +y2= 0. 2. Evaluate:
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