Virtual Lab Unit 3 1. Briefly describe the steps required to aseptically transfer bacteria from an unknown to a tube of liquid broth. You might have to research this using the "T" button (Tell Me More About...) To aseptically transfer bacteria from an unknown to a tube of liquid broth you have to flame the loop or wire before you begin to sterilize it. You then remove the caps from the tubes and flame the mouths of the tubes to prevent air-borne contamination. When all this is done‚ you have to
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with a beautiful lustrous sheen. It is malleable and ductile and has a high melting point. Platinum does not oxidize in air even at high temperatures and is unaffected by common acids. It is also corroded by halogens‚ cyanides‚ sulfur‚ and caustic alkalis. Gravel- is composed of unconsolidated rock fragments that have a general particle size range and include size classes from granule- to boulder-sized fragments. Gravel is an important commercial product‚ with a number of applications. Many roadways are surfaced with
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HAZCOM Safety Training Presentations Presented by Mark Cole Close Encounters with Chemicals We encounter chemicals almost every day – – – – Filling your vehicle with gasoline Cleaning the bathroom Applying pesticides or insecticides Using solvents or acids at work Many chemicals can cause injury or illness if not handled properly. Hazard Communication ‘Goals’ Right to Know chemical hazards PPE‚ first aid‚ spills/leaks Labels‚ Material Safety Data sheets Right to Know OSHA created
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-425.93 -92.30 -407.27 -285.83 Hess’s Law: ΔH(rxn) = Sum[ΔH(f) products] - Sum[ΔH(f) reactants] ΔH(rxn) = [(1 mol)(-407.27 kJ/mol) + (1 mol)(-285.83 kJ/mol)] - [(1 mol)(-425.93 kJ/mol) + (1 mol)(-92.30)] = - 359.47 kj/molWhy are there energy changes when a chemical reaction takes place? Do physical state changes involve energy changes? Exothermic energy changes and endothermic energy changes in chemical reactions are described‚ and exothermic reactions and endothermic reactions are discussed
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INTRODUCTION Civilization has been overwhelmed with fearful reports that mankind is steadily working towards self – destruction through the process of uncontrolled pollution of the environment. A casual look at our surroundings shows reckless attitude of people towards environmental preservation. Due to this development‚ regulations and standards have been set to ensure cleaner and safer environment. These regulations are enforced by agencies like National Environmental Standard and Regulation
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Anil Kaura Chemical milk‚ popularly termed as "synthetic milk"‚ is the invention of devil-minded mafia of certain milk traders. Of late reports have been received that large quantities of such spurious and fatal product have found way in markets of Rajasthan‚ Himachal Pradesh‚ Uttar Pradesh‚ Bihar‚ Madhya Pradesh‚ Karnataka and Orissa. The monster is surfacing in Punjab and Haryana also. Chemicals like urea‚ caustic soda‚ refined oil (cheap cooking oil) and commonly used detergents are used in
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ANDREWS UNIVERSITY AFFILIATED AND EXTENTION PROGRAMS UNIVERSITY OF THE SOUTHERN CARIBBEAN P.O. BOX 175‚ PORT OF SPAIN Assignment: Thesis An Assignment Presented in Partial Fulfilment Of the Requirements for the course ENGL215-02: English Composition 2 03 October 2012 INSTRUCTOR: By Why is Dark Chocolate Healthier than regular Chocolate Chocolate is made from plants‚ which means it contains many of
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chemists as sodium bicarbonate‚ bicarbonate of soda‚ sodium hydrogen carbonate‚ or sodium acid carbonate. It is classified as an acid salt‚ formed by combining an acid (carbonic) and a base (sodium hydroxide)‚ and it reacts with other chemicals as a mild alkali. At temperatures above 300 degrees Fahrenheit (149 degrees Celsius)‚ baking soda decomposes into sodium carbonate (a more stable substance)‚ water‚ and carbon dioxide. Sodium bicarbonate was discovered by two workers at a college of medicine in
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difficult to isolate. The easiest way to get boron is by heating borax and carbon. Boron is a poor conductor of electricity at room temperature but when at high temperatures boron shows good conductivity. Boron is nonreactive to water‚ oxygen‚ acids and alkali. One of the many uses for boron is cleaning supplies and laundry detergent. Boron is found in borax‚ which is in those supplies. The borax and other borates clean and bleach by converting some water molecules into hydrogen peroxide and since the
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How does pH affect the activity of the Amylase? Abstract: In my experiment I aimed to observe how ranging pH levels will affect the rate in which amylase will break down the starch molecules. I will be measuring the time it takes for the dark liquid to disappear and leave a yellow brown liquid to be shown‚ which would show that there is no starch present in the solution because it would have broken into maltose by adding amylase. Results did not fully demonstrate what we expected in our hypothesis
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