Osmosis and diffusion lab report Sample

Osmosis and diffusion lab report Paper Introduction: The purpose of experiment 1 was to demonstrate the principle of simple diffusion and understand how to make % solutions. Exercise 2 demonstrated the principle of osmosis: observing the movement of water by osmosis from an area of lower concentration of a solute to an area of higher concentration of a solute. Materials and Method: Refer to pages 47-51 of Bio LOLL Lab Manual. Results/ Discussion: The effect of the chloride ion on its rate of diffusion in agar means it will diffuse faster because it is more concentrated. We graphed the diffusion of chloride ions rather than sodium ions because while the sodium ions do diffuse in to the agar the chloride ions from the Niacin will combine with silver ions, from Again and create a white precipitate. The white precipitate allows us to measure the the white band through the agar at different points and determine the rate of diffusion of the chloride ions. If the the agar concentration was increased 10% the rate of chloride ion diffusion would most likely decrease since it would be a denser gel. The rate of osmosis for tube 1 was 0 g/her, tube 2 was 1. 13 g/her, tube 3 was 3. 63 g/her, tube 4 was 6. 39 g/her, and tube 5 was 7. 51 g/her. The rate of osmosis depends on the concentration of sucrose the water will move from a lower concentration to a higher concentration. The factors that could have contributed to any errors in measurements, are incorrect petting, gives you less or more of the required amount needed in the dialysis bags, and will change the mass of each bag that is to be recorded. We will write a custom essay sample on Osmosis and diffusion lab report specifically for you for only $16.38 $13.9/page Order now We will write a custom essay sample on Osmosis and diffusion lab report specifically for you FOR ONLY $16.38 $13.9/page Hire Writer We will write a custom essay sample on Osmosis and diffusion lab report specifically for you FOR ONLY $16.38 $13.9/page Hire Writer

Alfred Nobel and the History of Dynamite

Alfred Nobel and the History of Dynamite The Nobel prizes  were established by none other than inventor Alfred Nobel. But besides being the namesake behind  one of the most prestigious awards given annually for academic, cultural and scientific achievements, Nobel is also well-known for making it possible for people to blow things up.  Ã‚  Ã‚  Ã‚   Before all that, however, the Swedish  industrialist, engineer, and inventor  built bridges and buildings in his nations capital Stockholm. It was his construction work that inspired Nobel to research new methods of blasting rock. So in 1860, the Nobel first started experimenting with an explosive chemical substance called  nitroglycerin. Nitroglycerin and Dynamite Nitroglycerin was first invented by Italian chemist Ascanio Sobrero in 1846. In its natural liquid state, nitroglycerin is very volatile. Nobel understood this and in 1866 discovered that mixing nitroglycerine with silica would turn the liquid into a malleable paste called dynamite. One advantage that dynamite had over nitroglycerin was that it could be cylinder-shaped for insertion into the drilling holes used for mining. In 1863, Nobel invented the Nobel patent detonator or blasting cap for detonating nitroglycerin. The  detonator used a strong shock rather than heat combustion to ignite the explosives. The Nobel Company built the first factory to manufacture nitroglycerin and dynamite. In 1867, Nobel received U.S. patent number 78,317 for his invention of dynamite. To be able to detonate the dynamite rods, Nobel also improved his detonator (blasting cap) so that it could be ignited by lighting a fuse.  In 1875, Nobel invented blasting gelatine, which was more stable and powerful than dynamite  and patented it in 1876. In 1887, he was granted a French patent for  ballistite, a smokeless  blasting powder  made from nitrocellulose and nitroglycerine. While Ballistite was developed as a substitute for black gunpowder, a variation is used today as a  solid fuel rocket propellant. Biography On October 21, 1833, Alfred Bernhard Nobel was born in Stockholm, Sweden. His family moved to St. Petersburg in Russia when he was nine years old. Nobel prided himself on the many countries he lived in during his lifetime and considered himself a world citizen. In 1864, Albert Nobel founded Nitroglycerin AB in Stockholm, Sweden. In 1865, he built the Alfred Nobel Co. Factory in Krà ¼mmel near Hamburg, Germany. In 1866, he established the United States Blasting Oil Company in the U.S. In 1870, he established the Socià ©tà © gà ©nà ©ral pour la fabrication de la dynamite in Paris, France. When he died in 1896, Nobel  stipulated the year before in his last will and testament that 94 percent of his total assets go toward the creation of an endowment fund to honor achievements in  physical science, chemistry, medical science or physiology, literary work and service toward peace.  Hence, the Nobel prize is awarded yearly to people whose work helps humanity. In total, Alfred Nobel held three hundred and fifty-five patents in the fields of electrochemistry, optics, biology, and physiology.

The growth of suburbs and urban sprawl in the United States is a Essay

The growth of suburbs and urban sprawl in the United States is a problem, or just part of the natural growth of cities - Essay Example The move by the American government to push investments away from the central cities in the 19th century is a justification of a problematic scenario. An introduction of high housing tax rates proved homeownership as an alternative to wealthy Americans. â€Å"At the end of the 20th century and the beginning of the 21st century, housing prices in the United States rose rapidly during a period through which interest rates were low. Government tax policy made homeownership even more attractive† (Dahlman & William 393). The decision to retain a cultural practice is a factor of consideration in the suburb development and impact on the development of cities. The wealthy population developed a natural attraction to the rural environment influencing the growth of suburbs. This is a justification of a natural effect on the growth of metropolitans. The invention of the automobile industries acted as an immediate solution to the challenging city life. The wealthy opted to commute from th e suburbs to places of work as a way of evading city