Flame Lab Objective: How an electron absorbs energy and re-emits it as light and why different elements have different spectra. Also to learn how to use flame tests to determine the identity of unknown mixtures. Hypothesis: We know that certain compounds will burn certain flame colors because they emit different wave lengths. Introduction: Neils Bohr made the “Bohr’s Model” in 1922‚ he found that electron travel in specified fields – which‚ when excited‚ will jump to different rings
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electrons. For example‚ “the atoms in sugar do not form ions; instead‚ they are held together because of shared electrons.” 3. Do you think sugar or salt will melt at a higher temperature? Explain your answer. Since sugar is composed of covalent bonds and salt composed of ionic bonds‚ I think salt will take a higher temperature to melt because salt is bonded together by stronger bonds. Ionic bonds are much stronger than covalent bonds. Covalent bonds are not as strong as ionic bonds so it will
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processes to separate a mixture of solids into the four individual solids: sand‚ benzoic acid‚ iron fillings‚ and sodium chloride. To remove the iron fillings from the mixture I used a magnet and scanned it across the entire mixture and the magnet forced picked up all the iron pieces. Then to separate the sand from the rest of the mixture I heated the mixture with water in a beaker and when I poured the heated liquid into a cup the sand remained in the bottom of the beaker. Lastly to separate the benzoic
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Describe and explain the findings of the vegetation quadrats along a transect on Studland sand dunes. Figure 1 Figure 1 The results of the vegetation quadrats along a transect on Studland sand dunes showed that the amount of vegetation increased and changed‚ while the percentage of bare ground decreased as the sampling sites increased. The reasons behind this can be explained by clarifying what a typical transect is‚ starting with low embryo dunes near the shoreline and much taller mature dunes
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Name: Raaga Singireddy Mrs. M-K/Science Date: 6/3/2013 Pd. 2 Soil Lab QUESTION: What Soil Recipe will grow the best Pea seed? CLAIM: I believe that soil made up of 30% silt‚ 25% Water‚ 15% humus 5% Sand‚ 5% of Clay‚ and the assuming the other 25% is air‚ will grow the best pea seed. MATERIALS 100 Milliliter Dixie Cup Ground Clay _ Silt Water
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(dialysis tubing). The experiment will show how molecules in solution move from areas of higher concentration to areas of lower concentration in the attempt to reach homeostasis in different circumstances. Introduction: The main purpose of this lab was to observe diffusion and osmosis. This is demonstrated using dialysis tubing and a combination of monosaccharaides‚ disaccharides‚ water (H20)‚ and sodium chlorine
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Copper (II) Sulfate Purpose: The purpose of this lab is to find out how many moles of water there are in one mole of Copper Sulfate (CuSO x HO) and the percent by mass of water in the hydrate. This will be accomplished by heating a determined mass of the hydrate to remove the water‚ and by measuring the salt left over. Introduction: This laboratory experiment will be done to find out how many moles of HO are present per one mole in the hydrate CuSO. A hydrate is a compound that has a fixed number
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we have found out about the role of positive and negative charges that are useful in order to conduct energy. Simultaneously‚ we have also found out that saltwater conducts energy because of the solid salt it contains and when it is dissolved into water‚ the elements sodium and chloride from the salt separate or break up because of the very reactive traits of water (H2O)‚ thus‚ causing the production of positive and negative ions that are able to carry energy and consequently conducting electricity
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temperature of the solution at 80 degrees at all times and therefore may cause you to add more or less volume to the titrated solution. Finally‚ over the course of the experiment‚ we noticed different accuracies in the scales we used throughout the lab. The differences between different scales for the same sample go differ by up to 0.100g which could certainly impact the amount of solute we believe we have
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The primary focus of experiment 4 was to teach a student the basic solubility rules of salts in aqueous solutions. After developing and using a scheme for the qualitative analysis of three cations in an aqueous mixture‚ a student would use a centrifuge to identify‚ precipitate‚ and separate the three ions in the mixture. After becoming familiar with all three cations‚ the student would use the scheme again to identify at least two of the cations in an unknown solution. In order to begin the separation
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