EXPERIMENT 4B: THE MENDELEEV LAB OF 1869 Materials: 30 element cards‚ periodic table Aim: How can we identify elements based on their propeties? Background: Russian chemist Dmitri Mendeleev is generally credited as being the first chemist to observe patterns emerge when the elements are arranged according to their properties. Mendeleev’s arrangement of the elements was unique because he left blank spaces for elements that he claimed were undiscovered as of 1869. Mendeleev was so confident
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My Weight Loss Goal My goal is to lose 15 pounds over the course of 6 months. By focusing on this goal it will also help me to accomplish a few other goals that I have‚ such as; eating healthier and exercising on a daily basis. There are many obstacles that I will have to overcome to accomplish these goals‚ such as; the temptation to eat un-healthy snacks i.e. candy‚ chips‚ sweets and soda. It will also be difficult to find the motivation to exercise on a daily basis and finding the time to
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measuring cylinder • Stirring rod • Stop watch • Bunsen burner • Piece of Magnesium • Sand paper • Permanent marker 2.2 Diagram / Photograph 2.3 Procedure Firstly an aim and hypothesis were written up‚ then 2mm of water was poured into the measuring cylinder and that was tipped into the micro tube. Then The 2mm line was labelled with the permanent market. That water was then discarded. After this the piece of magnesium was cleaned with sandpaper and bent into shape. The acid was then poured
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Joe Schmoe Period 3 March 8‚ 2013 Lab Report: Empirical Formula of Zinc Chloride (ZnCl) * Purpose The purpose of this experiment was to learn how to determine the empirical formula. Empirical means “based on experimental evidence.” * Experimental Design The reaction that occurred was the reaction of the elements Zinc (Zn) and Chloride (Cl) by mixing a piece(s) of Zinc and 50mL of Hydrochloric Acid (HCl). The amount of Zinc was determined to be between 1.00g and 1.25g. As the reaction
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Moment of Inertia and Rotational Motion Garret Hebert PHY 2311 Tues 1:00 garret.hebert@hindscc.edu Abstract: During this lab we will study what rotational Inertia is and how different shapes of masses and different masses behave inertially when compared to each other. We will specifically study the differences of inertia between a disk and a ring. We will use increasing forces to induce angular acceleration of both a disk and a ring of a certain mass. We will then then measure the differences
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A The % Composition and Empirical Formula of a Hydrate: It Doesn’t Hold Water‚ Or Does It? 1. To determine the percent water in an unknown hydrate. 2. To calculate water(s) of crystallization for an unknown hydrate. 3. To determine the formula of an unknown hydrate. OBJECTIVES SKILLS Proper use of the following equipment: Dial-O-Gram balance (Laboratory Technique I)‚ electronic balance (Laboratory Technique II) and Bunsen burner (Laboratory Technique III). Dial-O-Gram balance‚ electronic
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indicated by a very pale pink color. To calculate the molarity of NaOH‚ the following equation was used MNaOH x VNaOH = MKHP x VKHP therefore the molarity was .125 M. INTRODUCTION This lab experiment covers the preparation of standard solution and the acid/base titration. The first part of the lab is to prepare a standard solution of Potassium hydrogen per. A standard solution is a solution of known concentration‚ in which it is prepared using exacting techniques to make sure that the molarity
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One interesting event from 1960 was the testing of the first atomic bomb by France. Between 1960 and 1966‚ seventeen bombs were tested by France. These bombs leaked radioactive materials that are still affecting citizens near the bomb sites in the Sahara Desert. It is estimated that hundreds of soldiers and nearly thirty million civilians were knowingly exposed to the radioactive areas. The bomb testings and radioactive exposure were reportedly meant to “study physiological and psychological effects
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Herbert Hoover once said “The use of the atomic bomb‚ with its indiscriminate killing of women and children‚ revolts my soul.” This is the opinion of not only Hoover‚ but for everyone else in the world as well. An atomic bomb is a dangerous weapon‚ no one can stop the power of an atomic bomb. The first place that America used the atomic bomb was Hiroshima‚ Japan. The bomb was too powerful and it killed thousands of people. The bombing in Hiroshima has been the final attack to Japan that stopped the
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IAEA Topic: Effects on Atomic Radiation Country Name: Kazakhstan Kazakhstan has been part of the United Nations for over 21 years‚ since Kazakhstan gained its independence from the Soviet Union. Kazakhstan has as a goal to overcome and solve the problem of Atomic Radiation with the help of all the delegates present today. Atomic radiation exists due to the use of atomic and nuclear weaponry and the malfunction or disasters in nuclear plants. The effects of atomic radiation have become a major
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