Absorbance of Light vs. Concentration of Colored Solution Introduction: Performing this lab showed the importance of light in virtual drug screening because light can be used in a variety of ways to obtain different kinds of information in research. Light can be used to determine the concentration of DNA or protein in solution‚ tag different objects such as cells‚ protein structures‚ or bacteria in order to determine whether there is a large amount of a certain substance‚ and to determine the size
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Potatoes Lab #1 Purpose: To find the molarity/concentration of potato cytoplasm. Materials: As on page 1 in the lab handout. Procedure: As on page 1 in the lab handout. Data and Observations: Test Tube # | Concentration of sucrose solution (mol/L) | Initial Mass (g) | Final Mass | Percentage change in mass | 1 | 1.0 mol/L | 3.00g | 2.25g | -25.0% | 2 | 0.9 mol/L | 2.70g | 2.07g | -23.3% | 3 | 0.8 mol/L | 2.92g | 2.25g | -22.9% | 4 | 0.7 mol/L | 2.60g | 1.94g | -25.4% | 5
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TABLE OF CONTENTS What is a Mixture? What are the types of Mixtures? Define:-solutions -suspensions -colloids (Draw and compare.) Methods of separation 1. Filtration 2. Distillation (simple and fractional) 3. Paper chromatography 4. Solvent extraction 5. Separating funnel 6. Evaporation 7. Crystallization 8. Sublimation Draw and explain each. What is a mixture??? A mixture is a combination of two or more substances that are not chemically
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concentration of salt (NaCl) affect the mass of a potato soaked in water (H2O) with different concentrations of NaCl over the course of 30 minutes? Hypothesis: It is expected that the solution with the highest concentration of salt will cause more mass loss to the pieces of potato. The pieces that will be placed in the solution with the lowest concentration of salt will have small weight loss. Finally‚ the pieces that will be placed in water (NaCl concentration 0) will gain weight. This is expected because
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You can separate solutions into two categories‚ colligative properties and non-Colligative properties. Colligative properties are different from non-colligative properties because they focus on the dissolved particles‚ not the solute itself. Non-colligative properties depend on the specification of the dissolved particles and the solvent. Colligative properties are properties that depend on the dissolved solutes in the solution. There are four main colligative properties; vapor pressure‚ freezing
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compound. Introduction The solubility product constant‚ Ksp‚ is a particular type of equilibrium constant. The equilibrium is formed when an ionic solid dissolves in water to form a saturated solution. The equilibrium exists between the aqueous ions and the undissolved solid. A saturated solution contains the maximum concentration of ions of the substance that can dissolve at the solution’s temperature. The equilibrium equation showing the ionic solid lead chloride dissolving in water is:
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with solution of investigated compounds were placed in the agar by working holes using a sterile crook borer. These Petri dishes were incubated for 24 h at 37oC [25]. The standard antibacterial drug gentamycin was screened under similar conditions for comparison. DMSO has no activity against microbial strains so it was alone used as a control. The results of Antibacterial bioassay for investigated compounds are
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the properties unique to solutions depend only on the number of dissolved particles and not their identity. Such properties are called colligative properties. The colligative property that will be examined in this experiment will be the freezing point depression as an example of a colligative property. Every liquid has a freezing point: the temperature at which a liquid undergoes a phase change from liquid to solid. When solutes are added to a liquid‚ forming a solution‚ the solute molecules disrupt
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being the highest point with a change of mass of 1.75% finishing with the 10% solution on a decline of -12.28%. From observing the scatter plot the data points were not far from the line of best fit‚ indicating the results were hardly affected by random errors. Resulting in fairly precise and reliable results. The hypothesis stated ‘As the concentration of sodium chloride increases the mass of the potato in the solution will decrease.’ This was supported as with the increase of sodium chloride concentration
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Write down the ionic chemical equation when the following pairs of solutions are mixed together. (Take note of their solubilities of the products formed) Question 1. riz Remember that all ionic compounds are soluble to an extent; those classi ed
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