that contain mercury‚ and ways to reduce your exposure to mercury. Sources of mercury: Mercury is an element in the earth’s crust. Humans cannot create or destroy mercury. Pure mercury is a liquid metal‚ sometimes referred to as quicksilver that volatizes readily. It has traditionally been used to make products like thermometers‚ switches‚ and some light bulbs. There are three types of chemical form‚ each have specific effects on human heath: Methyl mercury‚ Elemental mercury and other mercury
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Before the discovery of gallium‚ its existence and properties were predicted by the Russian chemist Dmitri Mendeleev. He named the supposed element eka-aluminum as he predicted the element would be below aluminum in the periodic table of elements. In the year of 1875‚ the element Gallium was discovered by French chemist Paul E. Lecoq de Boisbaudran through a spectroscope in Paris. De Boisbaudran extracted gallium from a zinc blende ore from the Pyrenees and obtained .65 grams from 430 kilograms of
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Experiment 1: Observations of Chemical Changes Purpose: To observe the macroscopic changes that occur in chemical reactions and attempt to interpret the microscopic changes of the atoms and molecules that allow for the macroscopic changes to happen; and to associate these chemical properties with household products. Also‚ it is to learn the importance of how to separate mixtures into their component substances by solubility. Procedure: Before starting with the official experiment‚ it was important
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Name: Marisa Malazzo Date: 7/17/14 Exp 1: Observations of Chemical Changes Lab Section: 76426 Data Tables: Part 1: Chemicals Well No. Observations of the Reaction A. NaHCO3 + HCl no color change‚ some small bubbles formed B. HCl + BTB changed a yellowish orange color‚ no bubbles or precipitation C. NH3 + BTB changed a blue color D. HCl + blue dye changed a green color E. Blue dye + NaOCl no chemical change‚ only blue color appeared with the 1 drop of HCl
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Physical and chemical ProPerties Physical and Chemical Properties Lab RepoRt assistant This document is not meant to be a substitute for a formal laboratory report. The Lab Report Assistant is simply a summary of the experiment’s questions‚ diagrams if needed‚ and data tables that should be addressed in a formal lab report. The intent is to facilitate students’ writing of lab reports by providing this information in an editable file which can be sent to an instructor. Substance Name Mg Cu Zn
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Self-assessment practice tests Test 1 – Material from Chapters 2–4 | 45 minutes 1 The kinetic theory suggests different arrangements for the atoms or molecules in the three states of matter. The diagrams below show how evidence suggests the particles are arranged in the three states of matter. 1 2 3 What are the three states shown? 1 A B C D 2 gas liquid solid liquid 2 liquid gas liquid solid 3 solid solid gas gas The graph shows the heating curve for a metal that is solid at room temperature (25
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Lab 4: Physical & Chemical Properties Purpose: The purpose of this lab is to distinguish if different substances react to heat or cold and if a solution is added to it during the experiment will it change the substance or leave it the same. Throughout the different tests each substance is put through a series of tests to determine if it changes in any way in regards to color‚ odor‚ or consistency from the start of the experiment. The results will be documented in table 1. Data Table 1: Solubility
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“mixt bodies”. In 1803 John Dalton developed the theory of atomism by conducting different experiments and he found out that each element is composed of different atoms to other elements. He also theorised that all the atoms in an element is identical and that compounds are made of two kinds of atoms combined together‚ which lead him to develop the idea that chemical reactions change the way atoms are grouped together. He also had a theory that atoms are in and could not be created nor destroyed
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deals with matter‚ its composition‚ and changes they undertake. Chemistry has been part in our lives ever since. It contributes to our existence‚ our culture‚ and our life. Chemistry explains why changes happen around us. All living processes are chemical reactions. It helps in sustaining our needs. Through this we are able to feed the world’s population‚ medicines to cure diseases and improve health‚ and to protect our environment. Chemistry plays an important role in our lives. It contributes
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Table The periodic table is a table‚ where all known chemical elements are arranged. They are organized on the basis of their atomic numbers‚ electrons and chemical properties. The atomic of an element is the same as the number of electrons or protons in that particular atom. They elements in the table are placed in order from the lowest to the highest. 429768018669000The periodic table is ordered into periods and groups. A row of elements across the periodic table is calleda a period. Each period
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