Joshua McMahon IB Chemistry Matt Chase 3A 2/13/15 Finding the PH of different concentrations of orange juice. Research Question By diluting concentrated orange juice with water‚ can you significantly change the PH value? Introduction Across the world‚ it is thought and widely accepted to believe that Orange juice is the cure to many terrible diseases. However‚ this may not be true anymore. It has been said that Oranges are very high in vitamin C‚ therefore one should drink it every morning
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Exploration How do increasing sucrose concentrations of 0.0 mol dm3‚ 0.2 mol dm3‚ 0.4 mol dm3‚ 0.6 mol dm3 and 0.8 mol dm3 affect the osmolarity point of potato cells‚ where it is investigated how osmosis changes the weight of the potato cells‚ measured by the percentage change between the initial and final mass of the potato? Independent Variable: Increasing sucrose concentrations Dependant Variable: Mean percentage change in mass of potato cells All cells have a protective barrier‚ one which
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molecules possess kinetic energy (energy of motion)‚ they are constantly moving enabling the passive transfer of certain substances into and out of cells. Diffusion is the passive movement of molecules from an area of higher concentration to areas of lower concentration. In a closed environment‚ molecules will disperse until they reach a state a dynamic equilibrium. As the molecules approach equilibrium‚ the net or overall rate of diffusion begins to slow and occurs equally in all directions. In
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Analyzing a Hydrogen Peroxide Solution Purpose: The technological purpose of this investigation is to test and evaluate the percent concentration of consumer solution of hydrogen peroxide. Problem: What is the percent concentration of hydrogen peroxide in a consumer product? Design: An acidic solution of primary standard‚ iron (II) ammonium sulfate-water (1/6)‚ is prepared and the potassium permanganate standard. A 25.0 mL sample of a consumer solution of hydrogen peroxide is diluted to 1
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2. Explain your graph : 3. Define simple diffusion: 4. Define osmosis: Osmosis can be defined as the movement of solvent molecules across a semipermeable or selectively permeable membrane ‚from a region of lower concentration of the solute to that of a higher concentration till equilibrium is attained. 5. What is the change in the level of molasses in 10 minutes? 6. What is the change in the level of molasses in 30 minutes? 7. What force is responsible for the movement of substances
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Aim: To investigate the rate of reaction between Calcium Carbonate (CaCo3) and hydrochloric acid (HCl) by changing the molarity of the acid and measuring how much Carbon Dioxide (Co2) is produced. Hypothesis: I predict that the higher the molar concentration of the acid the faster the reaction will take place therefor creating more gas in a shorter amount of time. I think this will happen because when the acidity is higher the solution is stronger which then speeds up the reaction process. Safety:
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there was 0.0045mol of NaOH‚ because of this ratio of 1:1‚ there will also be 0.0045mol of H3O+. 4. The molar mass of the unknown acid is 220. 1. When the end point is reached in an acid-base titration‚ the relationship between the concentrations of OH- and H3O+ are that they are equal. This
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selectively permeable membrane from higher to lower concentrations. A selectively permeable membrane allows only some thing to go through. Water and oxygen are examples of molecules that are able to go through the membrane by diffusion. The net movement of these particles happens down the concentration membrane. Both diffusion and osmosis are passive
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following correctly describes the solubility of the solute in the given solvent? A) CaCl2‚ soluble in hexane B) octane‚ soluble in water C) CCl4‚ soluble in water D) mineral oil‚ soluble in water E) NaHCO3‚ soluble in water 4) What is the concentration‚ mass/volume percent (m/v)‚ of a solution prepared from 46 g NaCl and 2.5 L of water? A) 0.050% (m/v) B) 5.0% (m/v) C) 1.8% (m/v) D) 0.020% (m/v) E) 20.% (m/v) 5) Which of the following molecules can form hydrogen bonds? A) CH4 B) NH3
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Experiment: At this experiment we are investigating does the temperature affect how quickly the particles diffuse to an even concentration throughout the water‚ we are going to do this experiment by using food coloring to see how quick the food coloring diffuse in hot water and cold water. Materials: • • • • • • • • One beaker Hot plate Ice Water Food coloring Thermometer Timer Eye dropper Hypothesis:I think the food coloring will spread faster‚ because the particle in the hot water have more
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