Essays on Water

Osmosis is the dispersion of water. Our cells are capable of absorbing nutrients because, the cell membrane is selectively permeable (some molecules can effuse freely through the membrane while others cannot). In this experiment we used dialysis bag as a model of the cell membrane. Our hypothesis was that the glucose will diffuse out of the membrane into the beaker filled with iodine solution. To demonstrate dialysis tubing we used water, starch and iodine. When starch and iodine react together…...

Ms Olivia Lum is the founder of Hyflux – a leading water treatment company listed on the mainboard of the Singapore Stock Exchange. Where the names of Sim Wong Hoo of Creative Technology and Ron Sim of Osim were often heard, Olivia Lum is Singapore’s very own true-blue female entrepreneur. To her belt of titles are the Ernst & Young Entrepreneur of the Year Award 2003, Singapore’s Most Creative Entrepreneur 2003 and Her World’s Woman of the Year 2002. Olivia…...

Which in turn would give lower liters per mole ratio and State that there is less H2O gas then there actually is. Molar Volume Calculation for distorted trial one ;0. 011 L H2O = IS. Mm/L (4. 9 x 10-4 -e . 0002 mol of distortion) 7. A different student fails to insert the stopper into the flask while determining the available volume of the 125 ml flask. What effect does this error has on the calculated molar volume? Mathematically…...

Meghan Group has already invested USED 1 Billion for setting up new lines of business and great expansion programs such as chemical complex, power, salt, seed crushing, cement and media. Meghan Group has contributed almost 75 million US Dollars as Tax to the state exchequers in Fiscal year 2012-2013. Corporate Vision, Mission, and Values: Vision: We are passionately creating sustainable economic value for our country and stakeholders by contributing to the industrial development of the nation and fundamental requirements of…...

Materials: 9 test tubes Test tube rack Test tube holder Grease pencil Hot plate 20 ml honey solution 20 ml egg white and water mixture 20 ml corn oil Oats and water 20 ml gelatin and water solution 20 ml potato and water mixture 20 ml apple juice and water mixture 20 ml unknown substance  0 ml unknown substance  Paper towels 600 ml beaker Brown paper Beirut reagent Benedicts solution Iodine solution Procedure:  Place test tubes in the test tube…...

Liquid is usually confined in a container, so its volume is relative to the volume of its container There are various instruments that are used to accurately measure the density of substances; the most commonly used are the densitometers, viscometer and hydrometers [3]. In this experiment, the density of selected liquid samples will be measured using a viscometer. 1. 2 Objectives of the Experiment 1 . To determine the density of low boiling point liquid samples by measuring their mass…...

It was in her sense of education, more than any other, that Mommy convey yet her Swinishness to us. ” Do you agree with this statement? Is it possible that Ruth McBride Jordan’ s unshakable devotion to her faith, even though she converted to Christianity from Judaism, stems from her Orthodox Jewish upbringing? 3. “Mommy’s contradictions crashed and slammed against one another like b umpire cars at Coney Island. White folks, she felt, were implicitly evil toward blacks, yet she…...

In this experiment, you Will investigate the variation in density among three Group AAA elements. You will use your results to predict the density of another Group AAA element. Pre Lab Questions: 1. How are elements arranged in a periodic table? – Atomic number 2. What are the vertical columns in the periodic table called? – Periods 3. What determines whether two elements will have similar chemical properties? If they are in the same group 4. What property will you…...

In this experiment, we aimed to extract caffeine from the tea leaves in the tea bags provided beginning with a lid-liquid extraction method and then a liquid-liquid extraction. Extraction techniques are used to isolate and remove particular compounds form another substance. For both solid-liquid and liquid-liquid extraction techniques, solvents should be chosen by their miscibility in water (should be immiscible), they should have relatively low boiling points for faster and easier extraction, and they should be enervative with the other…...

In this lab, the purpose is to measure whether the changes of substrate concentration will affect the rate of anaerobic respiration. Because the rate of reaction refers to how quickly the reactants are used up or how quickly the products are formed, one method is to measure the volume of gas given off, the more gas given off per time interval results faster reactions. Question: Will the changes in substrate concentration affect the rate of anaerobic reaction? Why or why…...

The following sample essay is about testing the effectiveness of biological control. Read the introduction, body and conclusion of the essay, scroll down. In this experiment, the effectiveness of biological control is tested using lady beetles and aphids. Lady beetles are predacious coelenterate that feed primarily on aphids (order hemisphere). Aphids feed on a plethora of plants including peach, plum, and apricot. Aphids are also vectors of plant disease. Eight replicates were conducted. In each replicate a lady beetle is…...

In the poem "Blessing", Imtiaz Ali bases the poem on a situation in which water is a very rare commodity and describes the scene that is created on the special occasion when water is available in plenty.The title of the poem is short, but not straightforward. When a reader initially reads the title ‘blessing’, the reader has no clue as to what the poem will be about. The first thing that came to my mind when I read the title…...

The following sample essay focuses on why pesticides are used in soft drinks. Read the introduction, body and conclusion of the essay, scroll down. In the August 10, 2006 news article of The Times of India, reports were made that after coming out from a cabinet meeting of the state’s Left Democratic Front (LDF) government, Kerala’s Marxist Achuthanandan said, “Neither Coke nor Pepsi can manufacture or sell their products in Kerala. Their licenses are being scrapped as well” (Surendran, 2006).…...

In 1835, the French chemist Charles Thilorier was the first man to discover dry ice. One day he opened a very large container of liquid carbon dioxide. The carbon dioxide would quickly evaporate, which left a solid dry ice in the bottom of the container. For the next 60 years, dry ice was observed in university laboratories. Dry ice is a solid form of carbon dioxide. Dry ice changes directly from a solid to a gas. This process is known…...

In ‘Blessing’ there is one main event; a municipal water pipe bursts upon a dry desert like country suffering from drought. In this essay I will be comparing the way Imtiaz Dharker describes the main event in ‘Blessing’ and the way Grace Nichols describes the main event in ‘Island Man.”Blessing’ is a poem about a hot, dry country, suffering from water drought and poverty, and how one day a miracle happens and a water pipe bursts spreading excitement and happiness…...

I concentrated HCI (drops) Discussion Bunsen burner Most chemical synthesis involves separation and purification of the desired product from unwanted side products. Some methods of separation, such as filtration, sedimentation, declaration, extraction, and sublimation were discussed earlier. This experiment is designed as a quantitative evaluation of your individual laboratory skills in carrying out some of these operations. At the same time you will become more acquainted faith two fundamental types of chemical reactions redo reactions and metathesis (double-displacement) sections. By…...

I have been asked to investigate the link between colour and heat loss. Does the silver or the black cup lose its heat faster? HYPOTHESIS I think that the silver cup will retain the heat for a longer period of time than the black cup, I think this because the black cup will absorb the heat, where as the silver cup will reflect the heat back into the cup causing the black cup to cool down faster than the silver…...

Hess’ Law of Heat Summation Hess’ Law states that: “The enthalpy change for any reaction depends  on the products and reactants and is independent  of the pathway or the number of steps between  the reactant and product”. BASICALLY:    Hess’ Law states “the heat evolved or absorbed in     a chemical process is the same whether the process     takes place in one or in several steps”     ­­;This is also known as the “law of constant heat summation”. All it means is that no matter how many steps the chemical     reaction proceeds through, the total heat evolved or absorbed    is the added heat values of each step and will always be    a constant figure for that process. For example:     When phosphoric acid (a tri­hydrogen acid) is neutralized     with a base, the hydrogens are neutralised in 3 steps:    STEP 1:   H3P04 + NaOH ­; NaH2PO4 + H2O ­gives X amount of heat     STEP 2:   NaH2PO4 + NaOH ­; Na2HPO4 + H2O ­gives Y amount of heat    STEP 3:   Na2PO4 + NaOH ­; Na3PO4 +H2O ­gives Z amount of heat    Therefore, the total heat of reaction (   Hrxn) is equal to: Law Of Constant Heat Summation There are two (2) ways to calculate the heat of reaction  using Hess’ Law: 1­  Equation Method (Algebraic Method) 2­  Heat of Formation Method (Summation Method) Equation (Algebraic) Method Strategy:    ­add equations for reactions with known enthalpies     so that their net result is the desired reaction Sample Problem 1: Use the equations below to determine the enthalpy of reaction for the decomposition of hydrogen peroxide: H2O2(l)         H2O(l)    +    1/2 O2(g) The equations are: 1­    H2(g)   +   O2(g)       H2O2(l)    2­    H2(g)   +   1/2 O2(g)      H2O(l) Hf = ­188 kJ Hf = ­286 kJ Solution: Sample Problem 2: Use the following equations: 1­    1/2 N2(g)   +   3/2 H2(g)       NH3(g) 2­    1/2 N2(g)   +   O2(g)     NO2(g) 3­    H2(g)   +   1/2 O2(g)     H2O(g) Hf = ­46. 0 kJ Hf = +34. 0 kJ Hf = ­242. 0 kJ to calculate the enthalpy of reaction for: 4 NH3(g)   +   7 O2(g)        4 NO2(g)   +   6 H2O(g) Solution: Practice Problem: Calculate the heat of reaction for the oxidation of one mole of ethanol to ethanoic acid: C2H5OH(l)   +   O2(g)         CH3COOH(l)   +   H2O(l) Use the equations below: ­    C2H5OH(l)   +   3 O2(g)          2 CO2(g)   +   3 H2O(l) 2­    CH3COOH(l)   +   2 O2(g)         2 CO2(g)   +   2 H2O(l) Hc = ­1367 kJ Hc = ­874 kJ Enthalpy of Formation  (Summation) Method Standard Molar Enthalpy of Formation: (             ) ­the amount of ____ (absorbed or released) when _________ of   a compound is formed from its _________________ in their  standard states ­most enthalpies of formation are ­ve (__________________)? therefore, most compounds are ___________ stable than the  elements they are made from…...

Having considered the phenomena of diffusion and osmosis I have been told to do a piece of coursework to investigate the rate of diffusion when using different concentrations of acid. I have been told to use Agar. Agar is extracted from sea weed and after dissolving in hot water it cools to form a ‘solid’ jelly although 99% of this is water. The agar is an inert medium that I am going to use to investigate the rate of diffusion.…...

Good forenoon to the Excellencies, respected instructors and my beloved co-workers. I would wish to speech on a really of import subject “save water” today at this particular juncture. As good all know that how the H2O is of import for the continuance of life on the Earth. It is the most basic demand of everyone ( human being, animate being, works and other micro-organisms ) . Water is the alone beginning of life, without H2O we can non conceive…...

Globalization through dam building (for electricity) and tourism (for economic security), has imposed positive and negative effects on many countries and cultures. This paper focuses on tourisms impact on Jamaica and the consequences dams have had in Thailand. For both countries globalization has had both advantages and disadvantages. Tourisms Effect on Jamaica Globalization through tourism has had a significant effect on Jamaica. Originally, tourism was intended to profit the country by tourist spending. It was believed the economy would grow…...

For this experiment, we will be using milk and food coloring to represent the water (milk) and gas (food coloring) in the respiratory system, as seen in the liquid-gas boundary of the alveolar wall (water) and its volume (gas). We will place the milk in a shallow dish so that it completely covers the bottom of the dish. Drops of food coloring are going to be added into the milk at the center of the dish, and then observed. Drops…...

For Muskingum method which is a hydrologic method, the discharge measurements alone are sufficient for routing. This is because it is assumed that the parameters of the Muskingum model capture the combined flood-propagating characteristics of a river reach. When the water resources schemes to be built are in their initial planning stages, the river gauging system may remain either underdeveloped or insufficient to give precise and rigorous measurements of flow depths and discharges. The Muskingum method is useful for predicting…...

Evaporation is a process where two liquids or solid mixed into a liquid can be separated. To separate two liquids mixed together, the liquid is boiled over a Bunsen burner until one liquid is completely evaporated. To separate a solid within a liquid, the liquid is completely evaporated and a solid will remain, which is called a residue. Procedure/Data: 1. Preheat a clean evaporating dish for 5 minutes; then cool and mass the dish. Mass of empty dish: 28. Egg…...

Drain the rinse solutions into an Erlenmeyer flask, k Don’t forget to rezone the balance prior to each new mass measurement. 7. Calculate the density and record the value in Data Table one Part B 8. Use the procedure in part A to determine the density of two beverages. Record all mass and volume data in Data table B and use clean glassware. Between successive beverage measurements rinse the pipette with the second beverage. V _ P re-Lab Questions 1.…...

Cut all these potato cylinders to same length using a scalpel-cut carefully away from my body. 7. I recorded the initial length of the potato cylinders on my result table. 8. Then I also measured the mass of each potato cylinder by placing In onto measuring scale and recorded the mass In the result table. 9. Afterwards the potato cylinder were placed into each test tube A. B, C, D. Leave it for 24 hours. Tubes I Initial Mass/g I…...

Coral Reefs Review of the Literature What are Coral Reefs? Coral reefs are said to be the foundation for many marine species, and are a crucial support for human life. The coral reef ecosystem is an a diverse collection of species that interact with each other and the physical environment. Coral reefs are the homes of many species including crabs, shrimp, oysters, and clams, foods eaten by humans on a daily basis. Coral reefs are among the most diverse and…...

Chemistry 200 Exam 1 Review Problems 1. Calculate the number of atoms in 10. 0 grams of Fe. 2. Give the mass number, #protons, #neutrons and #electrons for the isotope strontium-88. 3. Calculate the number of moles of carbon in 50. 0 g of benzene C6H6 4. A substance is found to be 38. 7 % C, 9. 7 % H and 51. 6 % O by mass. Its molar mass is 62. 1 g/mole. What is its molecular formula?…...

Background and Problem Definition Mercan Systems, Inc. founded in 1980 their first product being a desalinator which was used to remove salts from brackish well water supplied it to mobile home park residents in Florida. The product was very successful in the market and it quickly expanded to nearby hospitals and bottlers of water for sale to consumer. By 2000, they made vast improvement in their product by including particle filters, ozonators, ion exchange resins, and purifiers. It had kept…...

The following sample essay on The On Groundwater Lab. The answer is the fourth, fifth and sixth well-portions where there is a lower ground elevation. 12. 9 In Figures 12. AAA and B, two depressions are occupied by water, whereas others are dry. Explain the presence and absence of ponds in these two figures. In figure A, the pond was prevented into diminishing due to the saturated area brought about by the resistant clay in the first pond in figure…...

The following sample essay on Yeast Respiration Lab Report. All organisms need to breath. They have pathways that are organic molecules and capture In their TAP. Some of these organisms need oxygen to do this but not all of them require It. Organic carbon molecules are the energy source, and for waste Is carbon doodle (CO) and water (H2O). CO can combine with water to form carbonic acid during cellular respiration. Phenolphthalein can be used to help detect any changes…...

After the experiment, the experimental mole ratio of alum to eater will be calculated and then compared with the accepted mole ratio. (This is 12 to 1). Theory If this lab if conducted properly, the unknown substance will be determined to be alum because of melting point, percent hydration and percent sulfate. The first test that will be run has the purpose of revealing the alum’s melting point. Melting is defined as, the temperature at which a solid turns into…...

Aim: The aim of this coursework is to find out how varied amount of sulphur dioxide effect the germination of cress seeds.Safety: This experiment could be very dangerous because there are some chemicals, which are harmful for human body will be involved in this experiment. Such as sodium metabisulphite, it would damage your lungs and eyes when it mixed with gases. So, I will do the following things to prevent any accidents during the experiment.1, I will be following the…...

Aim: The aim of this experiment is to prepare propanone by oxidizing propan-2-ol with acidified potassium dichromate solution. Introduction: Ketones and aldehydes are important series in preparation of other compounds and they are commonly prepared by oxidizing alcohol which is done in this experiment. The experiment is an oxidation reaction where a secondary alcohol (propan-2-ol) is oxidized by acidified potassium dichromate. The reaction does not need to be heated but should be placed in an iced water bath as the…...

Abstraction 4-methylcyclohexanol was synthesized to 4-methylcyclohexene utilizing desiccation. 4-methylcyclohexanol was heated to reflux and the subsequent distillation ( 4-methylcyclohexe ) was collected. It was so purified utilizing Na chloride to divide merchandises and an anhydrous solid was so added and filtered. The resulting merchandise had a mass of 0.399 g and a percent output of 41 % . The merchandise was positively identified and characterized as 4-methylcyclohexene via IR and Br2 trial. Introduction Cyclohexene From Cyclohexanol Lab Report Conclusion To…...

A cooling curve is actually a line graph representing the change in the state of matter of a substance, either from solid to liquid or liquid to solid. In this graph, time is usually represented on the x – axis and temperature on the y – axis. The particles in the wax in the solid state slowly start to get more energy when heated and start to move more rapidly at a certain temperature and then change to liquid. When…...

Tornado is an atmospheric phenomenon that is manifested in the form of rapid vortex funnel with height of 1.5 km, extracted from the cumulonimbus cloud to the water surface or ground. Inside the tornado funnel air rises, creating a vacuum of 0.4 atm. When the funnel reaches the ground, its width is 50-500 meters. Air velocity in the middle of tornado reaches 200 m / s with a strong upward component. Tornado sweeps over the surface at a speed of…...

Wastewater treatment is the process of the reasonable utilization and purification of wastewater with the help of various means. Wastewater is quite a dangerous substance, because polluted water is harmful for the human health, the life of animals and fish. People require only pure water for various purposes (drinking, cooking, washing, etc.) so a system of the effective wastewater treatment is the need for everyone, because the amount of pure water on the planet is reducing constantly. People have to…...

Water supply is the provision of water to the individuals, industrial objects, private and public organizations with the help of the system of pumps and pipes. Water supply depends on the water quality greatly, because the government and the companies which are responsible for the water supply do not have right to provide people with poor quality and dangerous water. There are three essential purposes of water supply. First of all, the water is supplied for the domestic needs. People…...

Hydrology is the science which studies the water resources of Earth and analyzes the processes and phenomena which are related with water. Hydrology belongs to the circle of the sciences which study the physical and geographical peculiarities of Earth, its hydrosphere in particular. The subjects of the research are the water objects: oceans, seas, rivers, lakes, reservoirs, swamps and the water in its different conditions: snow, ice, underground waters, etc. At first hydrology developed like a simple branch of physical…...