Flooding in Bangladesh.
Flooding in Bangladesh. Formal Name: People's Republic of Bangladesh. Capital: Dhaka. Size: Total 144,000 square kilometres, land area 133,910 square kilometres. Topography: Broad deltaic plain. Chittagong Hills in southeast, Low Hills in northeast and modest-elevation highlands in north and northwest. Climate: Subtropical monsoon climate, wide seasonal variations in rainfall, moderately warm temperatures, high humidity. Climate generally uniform throughout entire country. Subject to severe natural disasters, such as floods, tropical cyclones, tornadoes, and tidal bores. Population: Officially given at 109,963,551 in July 1988. Bangladesh is trapped between two sets of floods: one caused by tidal surges and a rising sea level, and the other by rivers. > Silt, deposited at the mouth of the Ganges and Brahmaputra, has formed a large delta. This eventually created many flat islands. They attracted large numbers of farmers for rice growing. Further deposition of silt blocks the main channels and increases the flood risk by raising the beds of the rivers. Flooding is most likely to occur in late summer following the seasonal monsoon rains. > Water is pushed northwards by tropical cyclones up the Bay of Bengal. Silt deposits cause the Bay of Bengal to become narrower and the sea shallower. The water builds up to form a storm surge. The total height of the water can reach 8
Why Does Climate Change?
ASSIGNMENT ONE WHY DOES CLIMATE CHANGE? The average, long-range weather or state of the atmosphere of any place is known as climate. Climate is defined by temperature, precipitation, humidity, wind, cloudiness, and snow cover. The study of climate is known as climatology. There are different types of climate types for different locations around the world. They are Tropical, Desert, Alpine, Subtropical, Temperate, and Polar. Some carry warm temperatures, and some cold. There are many factors that can change climate. The irregular distribution of land and water surfaces is a major control of climate. Prevailing winds and belts of high and low pressure, and latitude all play a major role in climate and its constant changing. The climate for a region depends mainly on the yearly cycle of its temperature and moisture; this can dramatically change a region's climate. There are many other factors that play roles in climate depending on where the location is. Such as wind direction, seasonal humidity, location with respect to oceans and mountains, and cyclone activity. Even though there are so many factors to consider with climate, climate very slowly changes over time. There are many main types of climate change that are affecting our world. Some of them are Global warming, Ozone Depletion, and El Nino. These all affect our environment and have an impact on the human
The state of the union, given by President George W. Bush on Tuesday January 28, 2003, was overall an effective and clear message to the American population.
The state of the union, given by President George W. Bush on Tuesday January 28, 2003, was overall an effective and clear message to the American population. President Bush brings up many ideal solutions to our economic problems, while focusing on the needs of citizens. President Bush addresses three main goals for economic growth in the upcoming years. The Presidents first goal is the economy. "We must have an economy that grows fast enough to employ every man and woman who seeks a job," he said. President Bush proposed that all income tax reductions set for 2004 and 2006 be made permanent and effective this year. Many critics say his tax cuts and new spending are driving deficits to record levels. I personally do not believe in debt, but that we should concentrate on the sensible budget to reduce our national debt. Bush argues with these critics saying that his economic growth policies will bring in more tax revenue, while demanding "spending discipline" from lawmakers. This overall appears to be an effective plan for economic growth. The Presidents second goal is high quality, affordable health care for all Americans. Many citizens have been in need of an opportunity as this one to insure their children, as well as themselves. He also pledged to spend an additional $400 billion in his 2003 budget, that will be spread over the next ten years to strengthen and reform
Ionisation energy as evidence for sub-shells
Ionisation energy Ionisation energy as evidence for sub-shells Ionisation energy is a measure of the ease in which atoms lose electrons and become positive ions. The first ionisation energy is the energy required to remove one electron from each atom of a mole of gaseous atoms. M(g) - e- M+(g) Further electrons may be removed giving successive I.E. M+(g) - e- M2+(g) This energy is usually quoted in units of kilojoules per mole (kJ mol-1). Energy is required to remove an electron from any atom because there is an attractive force between the nucleus and the electron being removed which has to be overcome. The value of the first ionisation energy depends upon: ) The effective nuclear charge 2) The distance between the electron and the nucleus 3) The 'shielding' produced by lower energy levels Shielding involves the repulsion between electrons in inner, filled orbitals and electron being removed from the outer orbital. The graphs of atomic number against first ionisation number show that across each period there is an increase in ionisation energy. Beryllium (Group II) has an extra electron and proton compared with lithium. The extra electron goes into the same 2s orbital. The increase in ionisation energy (I.E.) can be attributed to the increased nuclear charge. The ionisation energy of Boron is less than that of Beryllium because in Boron there is a
Determining Chemical Formulas
Determining a Chemical Formula Abstract: The purpose of this laboratory is to create a bond between two or more substances to determine the empirical formula of the substance. The bond that is trying to be created in this lab is magnesium oxide. By heating the magnesium and introducing water, will create magnesium oxide which massing the final product and comparing it to the original will produce the values for the empirical formula. Procedure: The procedure was taken from experiment 5 in General Chemistry by Grace R. Hered. . Clean a crucible over a Bunsen flame for five minutes and allow it to cool to room temperature. 2. Weigh the crucible, and measure a 0.3g sample of magnesium in it. 3. Heat the crucible with its contents with the cover on for about 5 minutes. 4. Use the tongs to displace the lid slightly to allow air flow, and heat strongly for 10 minutes. 5. Remove the flame and somewhat cool, and add 2-3 drops of water. 6. Heat gently and then strongly with lid slightly displaced for 5 minutes 7. Cool crucible and then weigh. 8. Record your data and calculations Data: The following data table, table 2, was created after the weights were obtained. Weight of the crucible 19.83g Weight of the crucible & Magnesium 20.12g Weight of the Magnesium 0.29g Moles of magnesium 0.011929 0.29g Mg x (1 mol Mg / 24.31g Mg) = 0.011929 moles Weight of the
An investigation of iron tablets.
V.J. Clarke Access Chemistry Practical Assessment An investigation of iron tablets. This is an experiment to find out the amount of ferrous sulphate in milligrammes in iron tablets of the type given to patients suffering from anaemia. This can be evaluated by oxidising the iron with a known solution of potassium manganate 7. Apparatus Burette, 10cl³ pipette, Filter, Filter paper, Clamp stand, Graduated flask, Beakers, Conical Flask, Pestle and Mortar, Hotplate. Method Two iron tablets are crushed using the pestle and mortar, while 50cm³ of sulphuric acid is heated in a beaker on the hotplate. 25cm³ is added to the mortar and is mixed and filtered into a graduated flask. The mortar is swilled out with the remaining 25cm³ of warm acid, this is also poured into the filter. The contents of the graduated flask are made up to 100cm³ with distilled water. The filter should have removed the chalk which comprised the mass of the tablet. 0cm³ of the solution is transferred into the conical flask using the pipette. The burette is filled up to the 0 mark with potassium manganate 7 solution. The potassium manganate solution is added to the iron solution slowly until the iron solution has a slight pink coloration. The volume level on the burette is recorded. This is repeated until two consistent results have been recorded. Results st Titration 2nd Titration 3rd
Amadeo Avogadro.
Amadeo Avogadro Amadeo Avogadro was an Italian scientist noted to be one of the founders of physical chemistry. He was actually a physics professor but he experimented in both physics and chemistry using mathematics to base most of his findings. Avogadro is well known for his hypothesis known as Avogadro's Law. His law states that a given temperature, equal volumes of gases contain the same number of molecules equal to 6.02252.1023. Avogadro received no recognition for his hypothesis or his constant during his lifetime because he was not considered as a brillant emperimenter but rather, a careless one. He also did not back up his hypothesis with an impressive display of experimantal results. He also did not have an impressive reputation for accurate experimental work. Another reason why his hypothesis was not recognized was because of the fact that his work was published in obscure jounals and maybe because he was very isolated from the mainstream of chemistry done in his time. Avogadro's work was recognized nearly fifty years after he had made his hypothesis. Two years after his death, his colleague showed how the use of Avogadro's number could solve many of the problems in chemistry. This time Avogadro's paper was looked at more carefully over a wider and more distinguished group of scientists, thus his work was finally recognized. Avogadro's work helped other
A neutrino is a subatomic particle that is very similar to an electron, but has no electrical charge and a very small mass, which might even be zero.
A neutrino is a subatomic particle that is very similar to an electron, but has no electrical charge and a very small mass, which might even be zero. Neutrinos are one of the most abundant particles in the universe. Because they have very little interaction with matter, however, they are incredibly difficult to detect. Nuclear forces treat electrons and neutrinos identically; neither participate in the strong nuclear force, but both participate equally in the weak nuclear force. Particles with this property are termed leptons. In addition to the electron (and it's anti-particle, the positron), the charged leptons include the muon (with a mass 200 times greater than that of the electron), the tau (with mass 3,500 times greater than that of the electron) and their anti-particles. Both the muon and the tau, like the electron, have accompanying neutrinos, which are called the muon-neutrino and tau-neutrino. The three neutrino types appear to be distinct: For instance, when muon-neutrinos interact with a target, they will always produce muons, and never taus or electrons. In particle interactions, although electrons and electron-neutrinos can be created and destroyed, the sum of the number of electrons and electron-neutrinos is conserved. This fact leads to dividing the leptons into three families, each with a charged lepton and its accompanying neutrino. To detect neutrinos,
The aim of my study is to investigate the following hypothesis: "New Towns have a higher environmental quality than Older Towns".
Introduction The aim of my study is to investigate the following hypothesis: "New Towns have a higher environmental quality than Older Towns" I intend to prove or disprove this statement as objectively as possible and to complete my assignment using both primary data (from field work-surveys / questionnaires) and secondary data (from other sources such as the Internet, libraries and books). To do this I have to collect sufficient evidence and acquire an overall understanding of the circumstances in both new and old towns. To do this I carried out 3 types of survey: * Environmental Street Surveys * Housing Quality Surveys * Questionnaires 'what do the town think?' Additionally I will investigate the Environmental quality of the towns Environmental Quality of Old and New Towns To obtain an understanding of the environment in Romford and Basildon I will be looking at factors such as crime rate, population, litter, education, services, vandalism, and resources. Furthermore I will use the results from the questionnaires I will carry out when I visit both towns, so I can compare what the town thinks, and the secondary data from sources such as books. Then I will use this information to make a prediction on if the hypothesis is correct. Environmental quality in Romford (Old Town) Property Prices (October-December 2002) RM4 1 Romford (RM3, RM6, RM7...) England &
To see how one variable affects the speed at which alcohol evaporates.
Evaporation Of Alcohol Aim: To see how one variable affects the speed at which alcohol evaporates. Background Information: I already know that forces of attraction between particles in a liquid are weaker than those in a solid. Liquids cannot be compressed because there is no space between the particles. Particles in a gas move quickly in all directions. Gases are easily compressed because there is more space between the particles. When a substance is heated it has more energy to escape the forces of attraction between the particles. I know that alcohol is very volatile compared to water. When a liquid is heated it will evaporate and become a gas. Many things affect the rate of evaporation: Room temperature Liquid temperature Surface temperature Surrounding wind speed Surface area of alcohol Concentration of alcohol Barrier of container alcohol is in. Prediction: I think that the 70 C experiment will make the most alcohol evaporate and the 30 C experiment will evaporate the least. I think this because heat speeds up the random movement of the molecules and so they will evaporate faster the hotter the water is underneath it. Method: See Plan. Diagram: Results: Test 1 Test 2 Temperature Of Water ( C) Volume Of Alcohol Left (Ml) Volume Of Alcohol Left (Ml) 70 9 9 60 9.3 9.2 50 9.4 9.3 40 9.5 9.4 30 9.7 9.7 Conclusion: I found
