Kinetics of the Harcourt-Essen Reaction Name: Manpreet Kaur Candidate Number: 7123 AS and A2 Aims: AS AIMS: 1. Investigate the effect of temperature on the rate of reaction. For this aim 3 sets of results will be obtained by timing how long it takes for the colour change to occur in different temperatures determined by the use of an electric water bath. With these results‚ the effect of temperature on the rate of reaction will be investigated. 2
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their absorbances are measured with a UV-Vis spectrophotometer (Table 1). The absorbances of three unknown samples with same concentration and a blank are measured (Table 2). The blank solutions are used as a reference solution to calibrate the colorimeter. The volumes of Fe solution for the delivery volume errors in the 10 ml graduated pipet are corrected (Table 3). The molarity (μg/mL) of Fe (o-phenanthroline)32+ in each standard solution is calculated by equation 2 (Table 4). A graph of absorbance
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Aim: This experiment aims to determine what effect an increase in the surrounding temperature has on the plasma membrane of a typical plant cell structure. Hypothesis: An increase in temperature will damage and denature the plasma membrane and cause the cytoplasm and other substances contained within the membrane to leak out. Introduction: The purpose of a cell membrane is to control the transport of substances moving into and out of a cell. The membrane is an extremely thin layer (8 to 10 manometers
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correct to find the true mass of the planet o Transit method - As the planet transits in front of its host star‚ the observed flux (brightness) of the planet drops - The drop in the light varies with the size of the planet (small planet small photometric effect) - Allows to determine: estimate of mass Radius Atmosphere of the planet Planets temperature 4. Paper - Astrophysics/ astrobiology goal: find earth planet in habitable zone - Extraterrestrial life is carbon based and needs
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beetroot will be heated for the same time for each one‚ also it will be left in the water for the same time after. Equipment:- Beaker Thermometer Heat proof mat Tripod Bunsen Burner Cork Borer 10 Beetroot cylinders Forceps 10 test tubes Colorimeter Measuring cylinder Also to improve the reliability of the test I will repeat the results. Method - Heat 200ml of water in a beaker - Whilst water is heating‚ place 10cm3 of water into each of ten test tubes. Label 85-45 and place in a water
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order of temperature of the water bath. Describe any relationship between the amount of pigment released from the beetroot and the temperature. g. If you have access to a colorimeter‚ set it to respond to a blue/ green filter (or wavelength of 530 nm) and note whether you are measuring absorbance or transmission. Check the colorimeter reading for distilled
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CORE BIOLOGY PRACTICALS You will need to know these practicals as the exam board may ask you questions based on them. Below is a summary of each one. Name of practical and independent & dependent variables Effect of caffeine on Daphnia heart rate Independent: caffeine concentration Dependent: heart rate of Daphnia Measuring the content of Vitamin C in fruit juice Independent: fruit juice Dependent: volume of juice required to decolourise 1cm3 of DCPIP The effect of temperature on cell membranes
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face. Measurements such as the person’s nose width‚ length of their forehead‚ and width of the lips are digitally stored and the data is used to identify a person; this process is known as geometrical recognition. An alternative process called photometric recognition‚ generates an outline of the facial features and uses the data for identifications. Data extracted from a picture can be scaled and be compared to other pictures in a database. The technology can be used to progress a child’s picture
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pupil of the eye glass window. If a body absorbs light fell on it‚ its internal energy increases‚ and thus its temperature increases. By changing temperatrata judge the flow of light energy. The unit of luminous flux of energy is J / s - W. 2. Photometric magnitudes a) flux - Ф Ф = K(λ). Ф(E) The work flow of light energy with a wavelength value and the spectral sensitivity of the eye for this length λ = 555 mm (green light). To produce the same sensation‚ the flow of red light with λ = 650
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Experiment 19 - Determination of the equilibrium constant for the reaction Fe3+ (aq) + SCN( (aq) = FeSCN2+ (aq) Object: To determine the equilibrium constant by a colorimetric method Theory: Colorimetric methods of analysis are usually applied to the determination of small concentrations of either inorganic or organic materials in a solution. The constituent sought must be coloured or must be capable of reacting with a reagent to produce a substance having a suitable colour. Beers Law‚ which
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