The Law of Definite Proportions states that a chemical compound contains the same element in exactly the same proportions by mass regardless of the size of the sample or source of the compound. This relates to the magnesium oxide lab because we tested out this theory to see if it is true that the law of definite proportions says that a chemical compound contains the same element in exactly the same proportions by mass regardless of the size of the sample or source of the compound. In this experiment
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Zinc oxide in a mixture with a about 0.5% iron(III) oxide (Fe2O3) is called calamine and is used in calamine lotion. There are also two minerals‚ smithsonite and hemimorphite‚ which have been called calamine historically (see: calamine (mineral). Zinc peroxide‚ ZnO2 .½ H2O‚ is a white to yellow powder that is used in antiseptic ointments. Zinc white is used as a pigment in paints and is more opaque than lithopone‚ but less opaque than titanium dioxide. It is also used in coatings for paper
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Working out the Formula of Magnesium oxide Aims When magnesium is heated in air‚ it reacts with oxygen. During this oxidation reaction‚ magnesium oxide is produced. This increases the mass. If we know the mass of magnesium at the start‚ and the mass of magnesium oxide produced at the end‚ we can work out the mass of oxygen which has been combined with the magnesium. We can use these masses to work out the formula of magnesium oxide. Apparatus Googles
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COMBUSTION OF MAGNESIUM OXIDE DESIGN Aim/Purpose: To calculate the number of moles and the empirical formula of magnesium oxide. Safety precautions: 1) Wear lab coat 2) Wear gogles. 3)Make sure the bunsen burner is working properly and their is no leakage. 4) Wear gloves. Hypothesis: The weight of the magnesium ribbon increases after burning‚ so this indicated that their was a change in mass. This change happened because of the magnesium ribbon inside the crucible which reacted with Oxygen
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The independent variable will be the mass of magnesium ribbon as different measurements will be taken and used for each trial. The dependant variable will be the mass of Magnesium Oxide‚ this is a measured variable as the mass of oxygen can be calculated and will enable us to determine the formula for Magnesium Oxide. The controlled variable is that the Magnesium used is possibly from the same ribbon and after being cut into lengths was stored in the same way in plastic containers. Preliminary -
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of Magnesium Oxide Aleshia Otieno Mr. Taylor SCH3U-01 Lab #4 Monday‚ November 17‚ 2014 Introduction Percentage composition is the percentage of a formula mass represented by each element. Percentage composition compares the mass of one part of a substance to the mass of the whole. The law of definite proportions states that a specific compound always contains the same amount of elements in fixed proportions by mass. By finding the percent composition of magnesium oxide one will essentially
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Writing Assignment 2: Bill Bryson’s “Cells” 1. According to Bill Bryson’s book‚ nitric oxide benefits the human cell by helping control the blood flow and level of energy for cells. It also attacks bad pathogens such as cancer. Nitric oxide manages the sense of smell and has been known to help aid penile erections. (Found on page 373) 2. When Bill Bryson mentioned that we are all youngsters based on our cellular level he was referring to a fact he had mentioned before about our brain cells
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Finding the formula of magnesium oxide Aims When magnesium is heated in air‚ it reacts with oxygen. During this oxidation reaction‚ magnesium oxide is produced. This increases the mass. If we know the mass of magnesium at the start‚ and the mass of magnesium oxide produced at the end‚ we can work out the mass of oxygen which has been combined with the magnesium. We can use these masses to work out the formula of magnesium oxide. Eye protection must be worn Apparatus Crucible and lid
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References: Allen MC‚ Donohue P‚ Gilmore M‚ et al. Inhaled Nitric Oxide in Preterm Infants. Rockville (MD): Agency for Healthcare Research and Quality; 2010 Oct. (Evidence Reports/Technology Assessments‚ No. 195.) Available from: http://www.ncbi.nlm.nih.gov/books/NBK56325/ Beckett‚ C.‚ & Kipnis‚ G.‚ (2009). Collaborative
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amount of sugar. Dark chocolate is proven to be good for the heart. A small bar of it every day helps the cardiovascular system run well. In recent study‚ it has been demonstrated that the flavonoids present in cacao stimulate the production of nitric oxid (NO) which helps the dilatation of the blood vessels allowing the easy blood flow to the heart and brain reducing the blood pressure(2). When blood pressure is lowered‚ there is a reduced risk of coronary heart disease. Additionally‚ the flavanoids
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