Chemistry NYA/701 practise questions test 1 autumn 2012 Audrey Goldner-Sauvé #1 Assuming a magnesium atom is spherical‚ calculate its volume in nm3. The diameter of a magnesium atom is 3.20 Å . The volume of a sphere is V = (4/3) r3. 1 Å = 1 x 10–10 m and 1 nm = 1 x 10–9 m and = 3.14 #2 What is the maximum amount of carbon dioxide that can be produced by the combustion of 0.450g of C2H5OH? #3 What mass of FeCl3 would contain the same total number of ions as 16.8 g
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great and tragic mistake. They should have been promoting magnesium. Magnesium deficiency leads to an increase in myocardial levels of both sodium and calcium. This is a problem because Coronary Artery calcium is a predictor of near-term coronary heart disease events. In the face of growing magnesium deficiencies calcium becomes increasingly more toxic to human physiology. It is magnesium that actually controls bone density not calcium. Magnesium drives the calcium into the bones where low levels encourage
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Signed_________________________________________ Abstract A common road salt‚ magnesium chloride‚ was analyzed in the lab to test its effectiveness as a road salt. The Van’t Hoff factor of the salt and the enthalpy of dissolution when dissolved in pure water were experimentally tested to evaluate its many characteristics as a deicer. To determine the Van’t Hoff factor‚ the difference of temperatures of freezing water and a solution of magnesium chloride was determined. A Van’t Hoff factor average of 2.88 was
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involved in burning magnesium metal. Materials Stirring rod Retort stand Ring clamp Clay triangle Crucible and lid Bunsen burner Flint lighter Balance Crucible tongs 40 cm of magnesium ribbon Method 1. Find the mass of a clean crucible and lid. USE THE SAME BALANCE DURING THE ENTIRE EXPERIMENT. 2. Curl the magnesium ribbon around a pencil to make a size that just fits inside the crucible. Do not curl the ribbon too tightly. 3. Describe the magnesium ribbon. 4. Find
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Name: Name of lab partner: Date: Title: Determination of the valency of magnesium Objective: To study the quantitative relationship between the amount of reactant and products of a reaction. A known starting mass of magnesium and the measured collection of hydrogen gas will be used to determine the reaction stoichiometry and the valency of magnesium. Introduction: In Chemistry‚ stoichiometry is the study of the quantitative relationship between amounts of reactants and products of a reaction
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The test tube with a side pipe was connected with a glass syringe. 3. About 3 cm of magnesium ribbon was measured out using a ruler. 4. The magnesium ribbon was polished using steel wool to remove any coating of oxides as magnesium can be a reactive metal. When magnesium is exposed to oxygen it reacts to form metal oxides. This step is necessary in order to obtain reliable results. 5. The mass of magnesium ribbon was measured and recorded using top pan balance. 6. Step 3‚ 4 and 5 was repeated
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Mass of Magnesium(Mg) (g) | Volume of Hydrogen (H₂) (cm³) | 1st trial | 0.040 | 39.9 | 2nd trial | 0.040 | 40.3 | 3rd trial | 0.035 | 36.5 | Quantitative data: The Magnesium was silvery-white‚ lustrous and relatively flexible before being placed in the burette. Whilst reacting with the hydrochloric acid‚ it dissolved and bubbles were visible. The hydrochloric acid slowly diffused downwards. Calculations: Volume of un-diffused hydrochloric acid = 25 cm³ Average mass of magnesium = 0.038
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THE Ksp of Magnesium Oxalate ABSTRACT INTRODUCTION In this experiment the solubility product constant of the salt magnesium oxalate (MgC2O4)will be determined. The system of interest exists as a solid in equilibrium: Precipitation reaction of EXPERIMENTAL METHODS Preparation of the 0.15M Potassium Permanganate (KMnO4) solution {text:list-item} B. Prepare precipitation mixtures 1. Obtain three labeled 20-mL vials from the cart. 2. Burets are set up in the lab with 0.250 M
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Nitric Oxide Therapy Imagine a newborn baby that is suffering from hypoxic respiratory failure‚ what would you do to help this? One of the major things that will help with this kind of issue in neonates is the administration of Nitric Oxide (NO). NO therapy has been approved by the FDA and is used in‚ not only neonates‚ but some adults. There are many advantages but there are also some disadvantages that will be discussed in this paper. NO therapies mode of action is classified as a pulmonary
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of magnesium · Change the amount of acid · Change the amount of water Method: · Set up apparatus as shown · Add 30ml of hydrochloric acid into the beaker · Measure 5cm of magnesium · Add the 5cm of magnesium to the hydrochloric acid · Put a bong onto the conical flask · Start timing · Measure the amount of gas collected every 10 seconds for 2 minutes Diagram: Prediction: I predict that as the concentration of the Hydrochloric acid increases‚ the time taken for the magnesium to
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