order of increasing atomic number with both their chemical and physical properties showing a periodic pattern. Students through carrying of laboratory experiments discover these properties of elements in the periodic table. Major properties to be examined are first ionization energy, atomic radius, physical and chemical properties. Purpose To understand periodic trends as it relates to atomic radius, first ionization energy, physical and chemical properties of elements. Equipments and Materials
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freshman year of college I took the first step of my half-hearted plan to pursue a career in medicine: enrolling in General Chemistry. Through my weekly allotted hours in lab, I realized the crucial role the environment plays in bringing about certain chemical reactions. This importance extends far beyond the controlled setting of a college laboratory, in which it seems even the air pressure is finely-tuned. For instance, the tarnished silver of the pendant which sits atop my neck is a pro duct of the
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Since the 1960s chemical castration has been widely embraced by the correctional justice system as a form of punishment and treatment for sex offenders. Offenders are treated with injections of a synthetic hormone that is used to lower their testosterone level, resulting in a decrease in their sexual drive. The change in sexual behavior is believed to have promising effects preventing the offender from relapsing into committing harm again. Although the drug is an accepted use of treatment there is
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sometimes known as Protium or just hydrogen, hydrogen-2, also known as Deuterium and finally Hydrogen-3, which is also known as Tritium. Although each isotope has a different number of neutrons; 0, 1 and 2, respectively. This has no impact on their chemical properties. But, it does however affect the physical properties. Namely their mass. Whereas Hydrogen-1 has an atomic mass of 1amu, Hydrogen-2 has an atomic mass of 2, due to the presence of a neutron in addition to the proton within the nucleus.
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elements that make up living cells. A Nitrogen atom has protons and neutron in the central nucleus with two electrons on the inside and four electrons on the outside. Electrons on the outer shell will interact electrons of atoms to determine the chemical properties of atoms. Nitrogen-15 isotopes neutrons vary unlike the Nitrogen atom. The fifteen stands for the atomic weight, seven protons and eight neutrons. The Nitrogen Ion has varying numbers of electron. An Ion charge is determined by its name
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al., 1998). It catalyzes the conversion of a large number of catechols producing a dark pigment called melanin, which is the product of the chemical reaction. Studies on enzyme activity are important in order to establish some controls. In particular, with regards to the cathecol oxidase, its inhibition can help to reduce the pigment production and the darkness of some vegetables and fruits.
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Chemistry is one of the most fundamental sciences of them all. The precious bonds of atoms hold together all life and all that support it. A good example of how chemical bonds and the reactions that forge said bonds is the reaction of Alka-Seltzer® tablets placed in water. People use these tablets to relieve pain. Which leads to the question; “Does the size of a particle have any affect on the time it takes for a reaction to complete?”. Alka-Seltzer® contain three key ingredients sodium bicarbonate
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1. What are three primary emissions from the nucleus of a radioactive atom? Alpha radiation, Beta radiation, and Gamma Ray. 2. Why are alpha particles of concern as a contaminant in drinking water? Alpha particles (radiations) are naturally occurring radionuclide present in the drinking water. They are positively charged and released from the core of some radioactive elements. Heavy elements such as radium and uranium are found naturally in the earth’s crust emit alpha particles which are released
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Carl Plattner was almost the first person to discover cesium in 1846. He was studying the mineral pollucite but ran out of materials before reaching the element. Cesium was first discovered by German chemists Robert Wilhelm Bunsen and Gustav Robert Kirchhoff in 1860. While they were studying the components of Durkheim water using flame spectroscopy, the chemists noticed an emission that they had never seen before. This element, soon to be named cesium, was the first element to be found using spectroscopy
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Lead Toxicity Animals can be exposed to material that contains lead by eating, drinking and inhaling. An item that most commonly is chewed and digested that contains lead is paint chips from older houses or barns. Drinking water from the faucet that has been contaminated with lead and served to the domestic pet. Household pets that use everyday batteries as play toys with licking and chewing. Insecticides can be inhaled by an animal while spraying is being performed. Even if a domestic pet or
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