An experiment to investigate how the effect of varying concentrations of salt solutions play on the movement of water in a potato.
PRELIMINARY EXPERIMENT AN EXPERIMENT TO INVESTIGATE HOW THE EFFECT OF VARYING CONCENTRATIONS OF SALT SOLUTIONS PLAY ON THE MOVEMENT OF WATER IN A POTATO. AIM The aim of this experiment is to try and find out how different concentrations of salt solutions affect the osmotic activity in a potato tissue. Thus we will be able to find out if the mass of the potato has increased or decreased in the different concentrations of salt solution. APPARATUS > A Single Fresh Potato > McCarthy Bottles = x 5 > Corks = x 5 > Water = 20cm3 x 5 > 2 Molar Salt Solution = 150cm3 > Test Tube Rack to hold 5 test tubes > Pipette > Scalpel - To cut the potato tubes into cylinders > Weight Measuring Scales > Ruler - To measure the potato cylinders accurately to 2cm long. > Cork Borer > Cutting Board - Where the potato can be placed and cut safely > Marker Pen will be used to write on the test tubes so that I will be able to distinguish between the potato cylinders and determine which salt solution is in which test tube. DETAILED INFO ON HOW TO PREPARE THE SOLUTIONS REQUIRED Just like my final experiment, in this preliminary experiment I increased the concentration in my five bottles by 0.5 moles, until it reaches 2 molar. mole in 1 litre requires 58.5g of salt to be dissolved in it. Therefore as 1 litre is 1000 cm3, I was thus able to take these into account and do my
For my experiment I am finding out the effects on the reaction rate when magnesium is put into different concentrations of hydrochloric acid.
Chemistry coursework: Rate of reaction Introduction My investigation is about reaction rates and finding out what affects them and the correlation between reaction rates and the factors which affect them. Therefore in my experimentation I tried to find out the effects of concentration (the amount of a specific substance in a certain volume of space) on reaction rate. Rate of reaction is the rate or speed at which the chemical reaction (a reaction that changes one set of chemicals to another) takes place. For my experiment I am finding out the effects on the reaction rate when magnesium is put into different concentrations of hydrochloric acid. 2HCL (aq) + Mg (s) MgCl2 (aq) + H2 (g) Hydrochloric acid (HCl) Hydrochloric acid, also known as spirits of salt or muriatic acid is a solution of chlorine and hydrogen. It is a highly corrosive, strong mineral acid which has many uses in industries. It is a clear liquid so if it gets on your skin you will not notice it which means that it would start burning your skin and could get onto food as well. Therefore always wash your hands after handling hydrochloric acid. Collision theory Collision theory is simply understood as the higher the concentration of the reactants, the higher the reaction rate. The more reactants there are the more successful collisions there will be. This theory
How is Orwell's attitude towards totalitarianism personified through the characters of Winston and O'Brian in this extract?
How is Orwell's attitude towards to totalitarianism personified through the characters of Winston and O'Brian in this extract? George Orwell's Nineteen Eighty-Four presents a negative utopian picture, a society ruled by rigid totalitarianism. The government that Orwell creates in his novel is ruled by an entity known as 'Big Brother' and in contrast to this, Winston Smith represents a rebellion, one which doesn't accept this ideology fed to him. Thus leading to his entrapment and confrontations with the complex character, O'Brian. Although the action deals in the future, there are a couple of elements and symbols, taken from the present and past. So for example Emanuel Goldstein, the main enemy of Oceania, is, as one can see in the name, a Jew. Orwell draws a link to other totalitarian systems of our century, like the Nazis and the Communists, who had anti-Semitic ideas, and who used Jews as so-called scapegoats, who were responsible for all bad and evil things in the country. Emanuel Goldstein somehow also stands for Trotsky, a leader of the Revolution, who was later, declared as an enemy "Within twenty years at the most, he reflected, the huge and simple question, 'Was life better before the Revolution than it is now?' would have ceased once and for all to be answerable". Another symbol that can be found in Nineteen Eighty-Four is the fact that Orwell divides the
Changes in Guilford's Central Business District from 1968 to 2002.
Changes in Guilford's Central Business District from 1968 to 2002 Aim The changes of many aspects of a CBD from the 1960s to the beginning of the 21st century had been immense, the changes nevertheless is an important feature of human geography that needs to be carefully studied. In order to achieve my aim I will have to identify the changes in land use from 1968-2002 in the CBD of Guildford and also compare the changes that had been made over the time. I will locate the areas with high and low pedestrian counts, and also the areas of high and low land value, both of which would give me a better overview of the CBD area. It will be equally important to identify zones of recent assimilation and discard to identify the changes. An investigation on the future changes of the CBD of Guildford would also be helpful to reach a higher degree of the understanding of the CBD and to explain the changes as our world today is advancing at an extraordinary pace in recent decays in many areas that already have, and definitely will cause great impacts on our lives. Guildford The understanding of Guildford's economical structure would help us to explain the changes of the CBD since structure of any CBD is largely affected by the local economy. Statistics has shown that the economy of Guildford is relatively good compared to other cities of similar size, Guildford has an area of 104 squared
Research question - Is using dogs for work ethical?
Dog behaviour CDA Introduction There are many ways that animals are connected to our lives. Some of us have them as pets, and even people who don't have a pet still have products (such as medicine) that have been tested on them. According to a website called 'The vegetarian site' very well known companies such as 'Max factor', 'Vaseline' & even 'Kleenex' have products that are animal tested. Some people protest that animal testing is not ethical because of the pain the animals have to endure for our benefit, but others argue that a lot of the medicine we have now wouldn't of existed if it hadn't of been so. A lot of argument has also gone into the concept of conditioning. We condition animals and even people without noticing we are doing it. Dogs are trained to sniff drugs in an airport and even children have a daily bed time that they are used to. So when J.B Watson sprung a debate about ethics when he conditioned Little Albert (who was just a baby at the time) to be afraid of rats and other things that looked similar, he had opened a controversy. Does there have to be pain to gain? Or will we ever find out if a dog thinks it is ethical for itself to be entered into a race? We were studying at school the behaviour and characteristics of animals that are similar to those of human beings alongside the ethics to support the current world debates & trends. This particular
How does the concentration of a sucrose solution affect the rate of Osmosis in Potato Cells?
Jennie Lace 10c How does the concentration of a sucrose solution affect the Rate of Osmosis in Potato Cells? PLAN I have chosen to investigate how the rate of osmosis taking place in potato cylinders varies when I change the concentration of the surrounding sucrose solution. I will vary the concentration of sucrose in the solution, and carry out various measurements on the potato cylinders before and after the experiment, to see what affect changing the concentration has had. I predict that with the lowest concentration of sucrose, the potato will increase in mass, because of water moving into the cells. The percentage increase will then get smaller each time I increase the concentration of sucrose in the solution. At some point, the mass of the potato will not increase, and will be the same as it was before (when there is no net flow of water particles in or out of the potato cells). After this, the mass of the potato will start to decrease as I keep on increasing the concentration of the sucrose solution. At some point the potato cylinders will lose all the water that they are able to, and the percentage mass loss will stop decreasing. This is what I expect the graph of my results to look like: Osmosis is the movement of water particles from a weak solution (a hypotonic solution) to a strong solution (a hypertonic solution. It happens through a selectively
Draw stress and strain graphs for the metal copper and the alloy constantan. Calculate the figures of young's modulus for copper and constantan. Discuss the physics involved.
AS Physics Data Analysis coursework This coursework assignment requires me analyse and evaluate data on copper and constantan given to me. It entails investigating the young's modulus of the metal and alloy. Thus I will use many methods during to complete my investigation. Aims: . To draw stress and strain graphs for the metal copper and the alloy constantan 2. To calculate the figures of young's modulus for copper and constantan 3. To discuss the physics involved Plan: In this investigation I have received results for extension of copper and constantan for certain forces applied to it, for which I will analyse and calculate the young's modulus. The results I have been given are forces applied to copper and constantan, three sets of results for the metal and alloy and this can be used by averaging data to give more accurate results thus these results given to me will be used to create graphs, calculate young's modulus and analyse data for both metals so I can complete my investigation. I will need to draw a force and extension graph for both copper and constantan, the extension shown will be the averaged value for each metal. I will also calculate the stress and strain values and plot this on a graph for both copper and constantan, I will plot these on the same graph and analyse the graph, hence I can find any patterns from the data and this will require me to draw
Sainsbury's organizational structure.
Task 3 (E4, C2, A1) Sainsbury's organizational structure Businesses are structured into different into ways according to the way they operate and according to their culture. The structure of business can affect the way it works and performs. You need to understand the differences between the following types of structure: * Tall * Flat * Matrix * Hierarchical Flat and tall structure:- The term 'scalar chain is a rather old fashioned one and stems from the days when large organizations were bureaucratic, with lots of layers between the top and bottom. Scalar chain refers to the number of levels within the structure or hierarchy of an organization. The scalar chain set out the authority, responsibility and the framework that determined superior and subordinate relationships. The idea of setting out everyone's role and position is to make it clear who is responsible for what, and that there is clear line of authority. Matrix structure:- A matrix structure can be used to combine the grouping method we have identified. In such a matrix it is probable that each member of the organization will belong to two or more groups. A matrix is thus a combination of structures, which enables employees to contribute to a mix of activities. The matrix enables the organization to focus upon a number of aims at the same time, and gives it the flexibility to respond to new markets where
To determine the water potential of a potato tuber cell using varying salt solution.
Aim To determine the water potential of a potato tuber cell using varying salt solution. Introduction Osmosis is the diffusion of water molecules from a region where it has higher water potential to a region where it has lower water potential through a partially permeable membrane1. As osmosis is a type of diffusion the same things that affect diffusion have an effect on osmosis some of theses things are: * The concentration gradient - the more the difference in molecules on one side of the membrane compared to the other, the greater the number of molecules passing through the membrane and therefore the faster the rate of diffusion2. * The surface area - the larger the area the quicker the rate of diffusion * The size of the diffusing particles - the smaller the particle the quicker the rate and polar molecules diffuse faster than non-polar ones3. * The temperature - the higher the temperature the more kinetic energy the particles have and so the faster they move. From the diagram4 we can see the process of osmosis in a simple expression. On the right side there is pure water, which has the maximum water potential of 0. Water potential is the pressure created by water. As you can see from the diagram the pure water is pushing its way through the semi permeable membrane at a high pressure. This is its water potential. Water potential is measured in kilopascals (kPa)
The impact of ICT on the local community. I live in the borough of Waltham Forest. Waltham Forest is quite an advanced community in terms of technology. Technology is used for various things, whether to make them more efficient or to provide a better serv
3D - The impact of ICT on the local community Introduction I live in the borough of Waltham Forest. Waltham Forest is quite an advanced community in terms of technology. Technology is used for various things, whether to make them more efficient or to provide a better service. Walthamstow is a small town located within Waltham Forest, which also harbours Leyton and Leytonstone. It is located to the North East of London and bordered to the north by Chingford, to the south by Leyton and Leytonstone, to the east by Epping Forest, to the west by Tottenham and the River Lea valley. Walthamstow is identified by the London plan as one of the 35 major centres in Greater London. Walthamstow's market is one of the longest daily outdoor markets in Europe and dominates the High Street. There are various shops lined along the high street with some high-end chain brands to several individually opened stalls that specialise in food, fabrics, household goods and other such stuff. The Mall in Selborne Walk is the largest place in the area to find lots of different brand shops selling high-end goods manufactured and produced to the mass public via corporations instead of individual businesses. The individual businesses tend to be all located outside on the high street. The central library has also recently been refurbished and modernised. It was expanded from 2006-2007 to hold a wider range
