Chapter I Introduction: Nowadays‚ water filters are important because of our environment. Many kinds of pollution affects our environment of water‚ that’s why those who drink water were caught having diarrhea or are even malnutrition. Water filters are very expensive that’s why those who are unfortunate causes themselves a long time to use water filters they just use temporary water that came from the ground. Charcoal is a dark grey residue consisting of impure carbon obtained by removing
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Experiment In this lab we were asked to observe changes and colors when mixing two or three chemicals together. The actual experiment itself used twelve different pipits and three chemicals I selected from my house. To begin‚ I first gathered everything‚ including the 96 well plate‚ 24 well plate‚ goggles‚ and gloves along with the observations of chemical changes bag. I set it up all on the the kitchen table that had paper towels on it. Next‚ I made my data table so that I could record my reactions
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occurrences such as the existence of elements. Atomos (in ancient Greek) means “that which cannot be further broken down into smaller pieces” This was Democritus idea of atoms Then came along Aristotle the most influential Greek philosopher‚ who didn’t agree with Democritus idea of atoms in fact he dismissed the atomic idea as worthless. He believed that everything on earth consists of four
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John Dalton was a born September 6‚ 1766 in Eagelsfield‚ Cumbria in England‚ but spent most of his life in Manchester. He was a British Chemist and physicist. He was the son of Weaver and he received his early education from his father. At the age of 12 Dalton began teaching at Quacker School in his native town. In 1781 he moved to Kendal‚ where he conducted a school with his cousin and his elder brother. He then went to Manchester in 1793 and spent the rest of his life in Manchester as a teacher
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From B.C times to present‚ the way the element silver is prepared‚ used and priced has slowly changed and evolved. Although these things change over the course of history‚ the chemical and physical properties of silver and any other element do not. Silver was not only used in Ancient Times‚ but throughout the Bible as well. Considered a precious metal since Ancient times‚ the element Silver is one of the earliest metals known to humans. While studying the element silver‚ it is import to look it’s properties
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Questions Chemistry 1A 1) Define an element. How many are there in the Periodic Table? 2) Write a table with the charges and masses of protons‚ neutrons and electrons. 3) Define atomic number and mass number. 4) Draw electron (energy level) diagrams for Be‚ S‚ Al‚ Cl and K. Also‚ write down the number of protons and neutrons for each. Finally‚ write the symbols (with mass no. and atomic no.) 5) Why have all Group 7 elements (halogens) got similar chemical properties? 6) Draw how ionic bonding
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Lesson 1.1 - Study Materials Slide 1 Lesson 1.1 : Scientific Method 1. Steps of the Scientific Method The scientific method (performing a study in organized steps) consists of: For example‚ applying the scientific method ultimately led to the enunciation of the Law of Conservation of Mass and Matter. Slide 2 1. Steps of the Scientific Method Step 1: Performing Experiments An experiment is a set of steps (procedures) that are performed under controlled conditions to propose or test
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century B.C. Greek philosopher. In 1803‚ John Dalton‚ who viewed the atom as a small solid sphere‚ and is credited for the developing of the first coherent atomic theory was now in the picture. This all led to the the first periodic table of the elements‚ and the history of the atom. Democritus was a greek philosopher who thought that all matter was composed of indivisble particles called atoms which is greek for “uncuttable”. He was born in 460 BC in Abdera which is in North Greece. Democritus
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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 same number of protons
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and analyzation of existing knowledge lead to new data or facts? Or is the other way around? My argument is that new ways of thinking lead to discovery of new facts and data. One such example from the natural sciences is the Periodic Table of Elements‚ by Mendeleev. The Russian chemistry professor Dimitri Ivanovich Mendeleev and German Chemist Julius Luthar
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