Investigating Factors That Affect Rates Of Reaction Aim: How does the mass of calcium carbonate affect its rate of reaction with hydrochloric acid? Hypothesis: I hypothesize that when the mass of the calcium carbonate increases‚ the rate of reaction of the calcium carbonate and hydrochloric will also increase. The collision theory states that the more successful collisions there are within the reaction‚ the faster the rate of reaction. When the mass increases‚ so does the number of particles
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Effect of Osmosis on Egg Introduction: The purpose of this lab was to test the effects of hypertonic‚ isotonic‚ and hypotonic environments on the weight of a shell-less egg. We tested the weight of the egg after thirty minutes in water as well as corn syrup. I hypothesized that when the egg was placed in water‚ it would swell and gain weight because it was in a hypotonic environment. That hypothesis was correct as the egg grew slightly and the weight when up. I also hypothesised that when the egg
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Investigating Stoichiometry with Carbonic Acid Salts Problem: Testing the actual yield versus the theoretical yield of NaCl when HCl is titrated into Na2CO3 and NaHCO3. When 0.15g of both NaHCO3 and Na2CO3 are titrated with HCl‚ then 0.165g of NaCl should form from the NaHCO3‚ and 0.104g of NaCl should form from the 0.15g of Na2CO3. Procedure: Weigh 2 samples of 0.15g of dried unknown each‚ and dissolve each into 50mL of distilled water. Add 0.5 to 1mL of bromocresol green indicator until the
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Investigating the Effect of Temperature on the Permeability of Membranes The permeability of membranes can be altered in several ways. From previous preliminary work I know that reagents‚ for example detergents and alcohol alter the arrangement of the phospholipids in the membrane allowing substances to leak out of the cell. Temperature also affects the membrane. As membranes relay on protein molecules to allow molecules to enter and leave the cell through facilitated diffusion the temperature must
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I have used the scientific method in my case study to prove my hypothesis‚ if a plant is grown in light it will grow faster than a plant grown in the dark. To conduct my experiment‚ you will need lima beans‚ potting soil‚ and styrofoam cups. First‚ put three inches of potting soil into each styrofoam cup. Then plant the lima bean seed about one inch below the surface of the soil. Next add three tablespoons of water to each cup. Put one cup in a window seal or where there will be bright light. Place
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AP Biology August 23‚ 2012 Egg Osmosis Lab Definition of osmosis: The diffusion of water across a selectively permeable membrane from high to low concentrations Hypothesis: If I place an egg in vinegar‚ then the outer layer of the egg is going to become slimy and look like rubber. It will also become larger and bubbles will form on and around the egg. Hypothesis: If I place an egg in corn syrup‚ then the egg will become small and the outer layer will not look like rubber any longer. Day one:
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Assignment in Research Methods 1) Overview of various research methods When writing a Research Paper it is important to know different research methods. These methods help to gather and systemize the information and data in order to scientifically prove the validity of the work. Further will be explained ways how to collect the data. Research methods are divided in two big blocks: quantitative and qualitative. Quantitative methods are those where results are explained in numbers‚ whereas
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Three of the earliest teaching methods were the Grammar-Translation Method‚ the Direct Method‚ and the Audio-lingual Method. Discuss these three methods. Also‚ explain their shortcomings which led to more current approaches in the teaching of grammar to L2 speakers. 1. i) Grammar Translation Method (GTM): Grammar-translation method is the extension of the Classical method which began in Germany (Prussia) in the late 18th century. It was then become popular in the early 19th century. It is one
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RESEARCH METHODS Advantages and Disadvantages. QUESTIONNAIRES are a set of written questions that are either given to respondents to complete or are posted to them. Questions may be close ended or open ended. Close- ended are designed to give specific or definite answer. Open- ended questions are designed to allow respondent to give their own answers. Questionnaires may be distributed by hand or by post. ADVANTAGES OF QUESTIONNAIRES. They allow a large number of questions to
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Introduction The movement of water molecules across a semi-permeable membrane is the process of osmosis. If there is a solute and a solvent‚ each containing different concentration levels‚ then the water would move along its concentration gradient until each side of the membrane are equal. The water moves because the membrane is impermeable to the solute and the solute concentrations may differ on either side of the membrane. Water molecules may move in and out of the cell‚ but there is no net diffusion
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