Purpose: To determine the percent magnesium by mass in magnesium oxide and to observe if the percentage composition is constant by comparing class results. Hypothesis/Prediction: The percent composition by mass of magnesium in magnesium oxide will not change significantly with each group that conducted the experiment. The composition of each substance should stay the same and any differences must be due to some error. Materials:Magnesium stripCrucibleCrucible coverClay triangleIron ringRetort standTongsBalanceBunsen
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During muscular exercise‚ blood vessels in the muscles dilate and blood flow is increased in order to increase the available oxygen supply‚ to allow the muscles required to function properly. Up to a point‚ the available oxygen is sufficient to meet the energy needs of the body. However‚ when muscular exertion is very great‚ oxygen cannot be supplied to muscle fibres fast enough‚ and the aerobic breakdown of pyruvic acid cannot produce all the ATP required for further muscle contraction. During
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Determining the Percent Oxygen in the Air INTRODUCTION: Recent tragedies in coal mines have exemplified the importance for us humans to breathe an adequate amount of oxygen if we are to survive. But what amount of oxygen is adequate? How can we know the amount of oxygen present in what we consider fresh air? The purpose of this experiment was to determine the percent oxygen typically present in air. The conclusion of the test suggested that the concentration of oxygen in the lab at the time
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Study of Oxygen Consumption to Measure Energy Metabolism in Mammals Brianne Simonsen Lab Section 8 4 Oct. 2005 Abstract In this experiment the oxygen consumption of a mouse in environments of varying temperatures was studied. The hypothesis behind this experiment was that more oxygen would be consumed at a lower temperature to maintain body heat. To measure the rate of oxygen consumption a mouse was given a specific amount of oxygen. The amount consumed in a specific time was measured and
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using proper units and showing all work. Please note that these problems require a balanced chemical equation. 1. Carbon monoxide reacts with oxygen to produce carbon dioxide. If 1.0 L of carbon monoxide reacts with oxygen at STP‚ a. how many liters of oxygen are required to react? b. How many liters of carbon dioxide are produced? 2. Acetylene gas (C 2H2) undergoes combustion to produce carbon dioxide and water vapor. a. How many liters of C 2H2 are required to produce 75.0 L of CO2? b. What volume
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Joseph Priestley was a famous scientist during the 18th century best known for is discovery of oxygen. He was born in Birstall‚ England on March 24‚ 1733. When Joseph was a boy he attended many different schools. He was sick very often when he was little this caused him to miss a lot of school. He began to learn to teach himself at home. This skill became very useful to him‚ as he got older. He then could very easily teach himself new concepts without a teacher. Then in 1752 Joseph began to attend
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These are the cells that transport oxygen in the blood from the lungs to the tissues. These cells also help transport some of the carbon dioxide from the tissues to the lungs. The main function of erythrocytes‚ namely oxygen transport‚ is carried out by the protein that makes up the majority of the protein composition of the cell‚ hemoglobin. We will also be looking at how hemoglobin delivers oxygen‚ and how many factors affect its affinity for oxygen. Lastly we will be looking at some
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A molecule of water consists of one oxygen and two hydrogen atoms joined by covalent bonds. Water as a liquid is vital to existence and plays extremely important roles in many aspects of both plant and animal lives. These aspects include temperature control‚ support‚ chemical reactions‚ transport and protection. Without the ability to control our temperature‚ we as humans would not be able to survive in our natural environment. If our internal body temperature was to rise or fall even a few degrees
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My City is Breathing Tasteless Oxygen & Yours? It is said that one can live without water for some days but without air no body can live for some counted minutes. Everyone knows this very clearly but nobody is concerned seriously about it. There are more than thousands of organizations which are working for reducing pollution‚ but they are unable in fixing restriction over it. Every day‚ thousands of seminars‚ presentations and meetings are conducted on this life enemy‚ all over the world. There
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Heated and Humidified High-Flow Oxygen Therapy Reduces Discomfort During Hypoxemic Respiratory Failure This research article was written after a randomized study was done to evaluate the effects that heated and humidified high flow oxygen therapy has on patients that suffer from hypoxemic respiratory failure. In general when a patient is admitted to the hospital and placed on a high flow oxygen device there is no heat or humidity added to the supplemental oxygen the patient is getting. As anyone
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