PEES 4200W- Physiology of Exercise Lab #2: Metabolism and Energy Expenditure 1. The Respiratory exchange ratio is the ratio of the volume of carbon dioxide produced and oxygen consumed. The ratio indicates the energy that the subject is expending for indirect calorimetry‚ how efficient the subject ’s body is at utilizing the oxygen inhaled‚ as well as the main substrate being used for energy during varying intensities of exercise. During rest the volume of carbon dioxide was 0.73L/min‚ the volume
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Population and its affects Population is becoming very dangerous for us because every day population was increasing. The demand of people is also increasing for crops and they also want cloths to wear. The most populated country in the world is China and second most populated country is India. Day by day for completing the demand of people government are cutting the trees and making industries and house for people because of this the percentage of oxygen is going down and the percentage of carbon
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Oxidation Number When elements combine to produce a compound‚ each element is assigned an “apparent” charge. This apparent charge‚ the charge an atom would have if both electrons in each bond were assigned to the more electronegative element‚ may be positive or negative. It is called the oxidation number or state of the element in the compound. Oxidation numbers are very useful in keeping track of what happens to electrons when various elements combine to form compounds. By remembering a few
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Sulphur dioxide in white wine Date: XX/XX/XXXX Objective To determine the total sulphur dioxide content in a brand of white wine. Theory Hydrogensulphite is often added to white wine for its preservation. Only a little amount of free SO2 exist in white wine. All the available SO2 (including those from hydrogensulphite) are first converted to SO32- as illustrated by the following equations. SO2(aq) + 2OH-(aq) SO32-(aq) + H2O(l) HSO3-(aq) + OH-(aq) SO32-(aq) + H2O(l) Addition of acid
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Topic 11a – Group 7‚ the Halogens Revision Notes 1) Trends in physical properties of the elements • At room temperature‚ Cl2 is a pale green gas‚ Br2 is a brown liquid‚ I2 is a blue-black solid. • In Group 7‚ boiling point increases down the group because the molecules have more electrons and‚ therefore‚ stronger van der Waal’s forces which require more energy to overcome them • Electronegativity is the ability of an atom to attract the electrons in a covalent bond • Down
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If this product comes in contact with the eyes immediately flush the eyes with water to prevent this always wear goggles. If this product is inhaled remove from contaminated area in serious cases‚ it is advisable to take the person to hospital. Nitric acid Test tube Corrosive on skin and toxic if swollen Wear goggles and a lab coat to prevent physical contact Immediately flush eyes with large amounts of water for at least 30 minutes and lift lower and upper eyelid as you are showering the eye
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e– Cr(OH)3(s) c. CrO42–(aq) + 3 H+(aq) Cr(OH)3(s) + 2 e– d. CrO42–(aq) + 4 H2O( ) + 3 e– Cr(OH)3(s) + 5 OH–(aq) e. CrO42–(aq) + 3 OH–(aq) Cr(OH)3(s) + 2 O2(g) 4. Write a balanced chemical equation for the oxidation of Cd(s) by concentrated nitric acid‚ producing NO2(g) and Cd2+(aq). a. HNO3(aq) + Cd(s) Cd2+(aq) + NO2(g) + OH–(aq) b. 2 HNO3(aq) + Cd(s) Cd2+(aq) + 2 NO2(g) + 2 OH–(aq) c. HNO3(aq) + Cd(s) + H+(aq) Cd2+(aq) + NO2(g) + H2O( ) d. 4 HNO3(aq) + Cd(s) Cd2+(aq) + 2 NO2(g) +
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Title: Nitration of Methyl Benzoate Objective: To prepare methyl-3-nitrobenzene from nitration of methyl benzoate. Results and calculations: Density = 1.094 g/ml = Mass of methyl benzoate = 1.094 g/ml x 2.8 ml = 3.0632 g no. of mol of methyl benzoate = = 0.022499 mol 1 mol of methyl benzoate produced 1 mol of methyl m-nitrobenzene. Therefore‚ 0.022499 mol of methyl benzoate produced 0.022499 mol of methl
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Section: 20711 Lab Experiment: Nitration of Bromobenzene Introduction: The chemical reaction of nitration consists of a nitro group being added to or substituted in a molecule. Nitration can basically be carried out by a mixture of concentrated nitric acid and sulfuric acid; this mixture is useful to obtain the active nitronium ion. Electrophilic aromatic substitution is a method used when a functional group is needed to be substituted on to an aromatic compound. In the nitration‚ nitronium ion
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A Sequence of Chemical Reactions: Transforming Copper Briefly describe. a) Why must you carry out the oxidation of Cu with HNO3 in a fume hood? Concentrated nitric acid is a toxic oxidant. Avoiding skin contact or inhalation is highly important. The reaction between Cu and HNO3 produces NO2‚ a toxic brown gas; therefore working under the fume is necessary in order to prevent inhaling the toxic gas. b) Why you should be particularly careful when you work with 3 M H2SO4 solution? Sulfuric acid
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