Purpose: The purpose of the lab was to investigate and demonstrate hydrogen bonding and London dispersion bonding in water and rubbing alcohol. Hypothesis: I believe water will have the greater surface tension because rubbing alcohol’s density is lower than water’s. Materials: * Water * Isopropyl alcohol (rubbing alcohol) * Pennies * Paper clips * Flasks * Cups or jars * Wax paper * Eyedropper Procedures: Part 1: Surface tension and vortex: * Fill
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slide; mixed with one drop of water and let air dried. After dried‚ heat fixation the slide by passed the slide over a flame quickly 2-3 times to stick bacteria to the slide. Next‚ the smear was sequence covered with crystal violet‚ iodine‚ 95% ethanol‚ and safranin; each reagent was rinsed with water after 1 minute. When decolorized with 95% ethanol‚ the smear was slowly covered drop wise until the run-off change from deep purple to clear and then rinsed with water. After 4 gram stains‚ the slide
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The Causes and Consequences of Marital Breakdown Marital breakdowns and divorces have become common in the last few centuries. These are frequently discussed phenomena in our modern society with various causes and heavy consequences. There is no single reason why a relationship begins to break down. However‚ once a relationship does start to decline‚ there is a predictable sequence of events that tends to occur. A marriage and divorce study from Britani‚ 1989-1999 clearly shows the rising tendency
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THE MOLECULAR BASIS OF INHERITANCE I. History A. Discovery of “transformation” – a change in genotype and phenotype due to the uptake of external DNA by a cell 1. Griffith 1920s did experiments with Streptococcus pneumoniae (p294 fig16.2) a. took two strains of S. pneumoniae‚ one virulent‚ one not b. heat killed virulent strain‚ then mixed them with the living nonvirulent strain c. living nonvirulent strain became virulent d. nonvirulent strain took on virulent strain’s DNA became virulent
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Write your name here Surname Other names Centre Number Candidate Number Edexcel IGCSE Chemistry Unit: 4CH0 Science (Double Award) 4SC0 Paper: 1C Wednesday 25 May 2011 – Morning Time: 2 hours Paper Reference 4CH0/1C 4SC0/1C You must have: Ruler Candidates may use a calculator. Total Marks Instructions black ink or • Usein the boxesball-point pen. page with your name‚ Fill at the top of this • centre number and candidate number. all • Answer
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to determine the molecular mass of a volatile liquid. II. Procedure • Place a cork with a small hole in it inside of a test tube and find the weight of the two together using a sensitive balance. • Pour 0.5 mL of the unknown volatile liquid into the test tube‚ insert the cork‚ and place the tube into boiling hot water while keeping the cork above water level. As the gas evaporates‚ excess gas will be released throughout the whole in the cork. Keep the test tube in the hot water for at least three
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1859 Charles Darwin published the "On the Origin of Species"‚ introducing that genetic evolution allowed adaptation over time to produce organisms best suited to the environment 1865 Gregor Mendel investigated "traits" passed from parents to prodigy and coined the terms dominant and recessive traits 1869 Johann Meisher isolated DNA from the nuclei of white blood cells 1875 Charles Darwin introduced "gemmules" as mechanism of inheritance 1902 Walter Sutton created
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called electrolysis. Whenever you place two pieces of metal in water‚ and apply electricity‚ the water separates into it’s basic molecules‚ Hydrogen and Oxygen (H2O). If you look at the picture on the left‚ you will see H2O molecules connected together in their liquid form which is WATER But when you apply electricity (from your car battery)‚ the molecules separate and form a GAS (called HHO) which is a mixture of Hydrogen and Oxygen. This HHO GAS is then sucked into your engine and mixed along
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Marital Breakdown In this assignment I am be going to talk about the different forms of marital breakdown. I am also going to analyse the reasons and trends of marital breakdown and divorce. Marital Rates Since 1981 the number of marriages conducted every year has fallen by a third. Marriages were at the highest rates between 1932 and 1946 . in 1981 marriage rates were in the UK was at 7.1 but by 2001 it was down to 5.1 per 1000 of the population per year. Cohabitation is on the increase
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Charcoal. Charcoal is one of the best substances to absorb smells. You will find that charcoal is used in many air and water filters. Grab a chunk of charcoal‚ the ones you use to grill will work fine‚ leave the charcoal in the car for a few days‚ and you will soon find the smells have gone away because they are absorbed into the charcoal. In this investigatory project its main purpose is to find out if how can charcoal be used as a filter and how does it work? Since charcoal is made out of carbon
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