appear. Results and Conclusions 1. Contained in the following chart: • Concentrations are calculated by multiplying the concentrations by the amount of liters of that solution divided by the total volume. • -∆S2O8-2 is calculated by dividing the concentration of the S2O3-2 by the number of moles required‚ as seen in the chemical equation (2 moles) • ∆t was determined during the lab
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Explain the technique by which copper can be purified. What is a use of pure copper? 19) Explain the processes of phytomining and bioleaching. 20) Why is recycling beneficial to the environment? 21) What % of iron comes from the blast furnace? What effect does this have on its properties? 22) Give some properties of low-carbon‚ high-carbon and stainless steels. 23) Why might an alloy of aluminium be preferable to the pure metal in aeroplane manufacture? 24) What name is given to the metals in
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Cell Energy SCI/230 9/28/12 Associate Program Material Cell Energy Worksheet Answer the following questions: * Cellular respiration: * What is cellular respiration and what are its three stages? * * Cellular respiration is the multi-step process in which oxygen is transformed within cells * producing carbon dioxide‚ the process purpose is transforming fuel intake into energy for cells. The three stages are glycolysis‚ citric acid cycle‚ and oxidative phosphorylation
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Name ____________________________ Date ____________ THE EFFECT OF CONCENTRATION ON THE RATE OF DIFFUSION PURPOSE: This experiment will explore the concentration gradient by measuring the rate of diffusion in a number of theoretical cells. The objectives for this lab are: (1) To define concentration gradient‚ (2) To explain experimental data concerning different concentration gradients‚ (3) To complete a data table and prepare a graph to illustrate the data‚ and (4) To apply information from
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THE FIRST LAW OF THERMODYNAMICS 1. (a) IN YOUR OWN WORDS‚ explain how Hess’ Law (of constant heat summation) applies to the 3 chemical reactions that will be studied in this experiment (b) Does the temperature decrease or increase for an exothermic reaction? (c) Is energy released or absorbed for an exothermic reaction? (d) What is the sign (positive or negative) for the ΔH of an exothermic reaction ? (e) Use the heat capacity of
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Biology Investigation: Effect of different concentrations of sucrose solutions on the mass of potatoes Research question Is the mass of potatoes going to be smaller or bigger in different sucrose concentration? Introduction Osmosis is a process that occurs at a cellular level that entails the spontaneous net movement of water through a semi-permeable membrane from a region of low solute concentration to an area of high solute concentration in order to equalize the level of water
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of the following statements is correct? A. Results from group B are more accurate because more athletes were tested. B. Results from group B are more reliable because it has a higher standard deviation. C. More athletes have their hemoglobin concentration close to the mean in group A than in group B. D. These results indicate that the level of hemoglobin follows a normal distribution. (Total 1 mark) 2. Which hypothesis can be tested using the t-test? A. The difference in variation between two
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germination of seeds which include the PH level of the soil‚ the amount of water in its environment‚ the amount of ATP the seed can generate in order to grow‚ the temperature of the environment and the amount of sunlight the seed receives (Ghaderi-Far et al.‚ 2010). The purpose of this study was to observe the effect of different concentrations of sodium chloride have on the germination of lettuce seeds‚ Lactuca sativa. A study done by Katembe et al.‚ (1998) stated that an increase in salt solution in
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The plasma membrane surrounds the cytoplasm of living cells‚ physically separating the intracellular components from the extracellular environment. It also plays a role in anchoring the cytoskeleton provide shape to the cell‚ and in attaching to the extracellular matrix and other cells to help group cells together to form tissues. The plasma membrane helps maintain homeostasis by diffusion and osmosis. Osmosis is the diffusion of water across a membrane. Diffusion is the process by which molecules
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INTRODUCTION The environments of Earth include conditions in which physical and chemical extremes make it very difficult for organisms to survive. Conditions that can destroy living cells and biomolecules include high and low temperatures; low amounts of oxygen and water; and high levels of salinity‚ acidity‚ alkalinity‚ and radiation. Examples of extreme environments on Earth are hot geysers and oceanic thermal vents‚ Antarctic sea ice‚ and oxygen-depleted rivers and lakes. Organisms that have
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