even this level of magnification was enough to discover a world of new scientific ideas. By 1840‚ Italian physicist Giovanni Amici (a-MEE-chee) had invented the oil-immersion microscope which could magnify objects 6‚000 times. In most middle schools‚ the highest level of magnification is usually about 400 times. Today‚ the transmission electron and scanning electron microscopes can magnify objects over 40‚000 times! CHALLENGE What is the correct way to use a microscope? C-22 © 2006
Premium Lens Electron microscope Optics
A process for the preparation of racemic phenylethylamine which comprises contacting an optical antipode therefore‚ e.g.‚ L(-) or D(+)-1-phenylethylamine with sodium amide or sodium hydride. Claim: What is claimed is: 1. A process for preparing racemic 1-phenylethylamine which comprises contacting L(-)-1-phenylethylamine or D(+)-1-phenylethylamine with 0.01 to 1 weight percent‚ based on theamount of said phenylethylamine‚ of sodium amide or sodium hydride at a temperature of 70.degree. to 150
Premium Nitrogen Hydrogen Base
Experiment 3 Preparation of 2‚ 4-Dinitrodiphenylamine Courtney Elahee Claim: The evidence will show that the red solid collected after recrystallization from the nucleophilic aromatic substitution of 2‚ 4-dinitrobromobenzene and aniline has the characteristics of 2‚ 4-dinitrodiphenylamine. Evidence: The procedure was carried out as described by Ault1 and the lab manual2. 2‚4-dinitrobromobenzene (0.92g‚ 3.75mmol‚ pale yellow solid) and aniline (0.7mL‚ 0.7g‚ 7.5 mmol) were boiled in ethanol (10mL)
Premium Thin layer chromatography Chromatography
DEFINITION Hospitality management is the professional management of a hospitality exchange process in a commercial environment. CONTENTS The contents of it are the hospitality exchange process (focus on how organizations deliver their product/service to the consumer) and the relationship between guest and host. Hospitality exchange process HOW OPERATED? (3 main domains of hospitality processing operations) Johnston has proposed the concept of three main types of operation of hospitality
Premium Hotel Hospitality industry
My ideal school is a school quite unlike any school we’ve heard of. This school consists of a large library and basic recreational facilities. And that’s all. There are no classrooms. The school motto is “I sought not to bring men to me‚ but to themselves‚” a quote by Emerson. The school is built on the idea of active learning. No student is forced to learn. This is a much more effective way of learning. Students at this school can really pursue their interests. Most importantly‚ students at this
Premium Education
|FOR FOOD SAFETY IN SCHOOLS | | |[pic] | Introduction This NUT guidance has been prepared to highlight the health and safety hazards which can exist in the absence of clear policies and procedures on the safe preparation of food in schools. It covers a range of issues which need to
Premium Food safety Hygiene Occupational safety and health
is “schools should not be permitted to sell unhealthy foods.” Everybody from teachers to parents over the years have been trying to stop junk food from taking over the tuck shops at schools and polluting students’ bodies with food that lacks the essential vitamins and other important nutritional value that all students need to do well in school. I agree strongly with the fact that junk food should be banned in school tuck shops‚ but I do have a few points in the favour of not banning junk food completely
Premium Nutrition
Name : Bùi Quỳnh Như Class : 12DTA01 ID : 1211200015 Preparation for The Tet Holiday in Viet Nam Tet ( New Year’s Day) is the most important holiday of Vietnamese to celebrate . The Vietnamese think that all things have to be new‚ fully and lucky for comming year. Therefore Vietnamese prepare carefully to welcome new year. They decorating the home‚ cooking traditional Tết food‚ buying flower and everything they need in this holiday. About 2 week before Tet‚ Vietnamese will decorate and
Premium Vietnam Fruit South Vietnam
Experiment 2 Date: 24 January 2006 Title : Crystallization of a Crude Sample Objective : Preparation of pure diphenyl via crystallization of crude diphenyl dissolved in ethanol. Structural Formula of Organic Substances Involved : Diphenyl Ethanol Apparatus : Round-bottom flask (100 mL)‚ measuring cylinder (50 mL)‚ conical flask (50 mL)‚ filter flask‚ beaker (100 mL)‚ stemless glass funnel‚ Hirsch funnel‚ capillary tube‚ long glass tube‚ watch glass‚ glass vial‚ water condenser
Premium Laboratory glassware Chemistry Distillation
4.2 Separation Techniques & Assessment of Purity By Grace Ngana |P3 |You have briefly written up what you did in measuring the melting point in 3rd person past tense. | Determining the melting point of aspirin • Firstly we turned on the melting point equipment; we referred to data tables for the actual value for the melting point of the aspirin. • Then we arranged the equipment to a point below the expected melting point we then noted that the rate of heating
Premium Titration Liquid Sodium hydroxide