The Effect of the Molecular Weight of a Substance to its Rate of Diffusion Paulo E. Garcia Group 2 Sec U-7L October 16, 2014 ABSTRACT The rate of diffusion was tested by using a petri dish with agar-water gel and three drops of different solutions. These solutions were observed for thirty minutes and measured every three minutes. The different solutions used are Potassium permanganate with a molecular weight of 158 g/mole diffused the greatest distance among the three, Potassium dichromate with a molecular weight of 294 g/mole diffused the lesser than that of Potassium permanganate, and Methylene Blue with a molecular weight of 374 g/mole diffused the least distance. Therefore, the lower the molecular weight of a substance,
Exploration Title: Effect of Temperature on rate of Osmosis Submitted By: Abdulkarim Kamal Date Submitted: October 19th 2015 Subject: Biology HL Teacher: Mr. Nick Aim: This is an investigation to determine the relation between temperature of a solution (sucrose) and the rate of osmosis Scientific Context: Osmosis is defined a passive transport process in which a fluid diffuses across a semi-permeable membrane, from an area of high solute concentration to an area of low solute concentration and vice-versa. There are various factors that could potentially influence the rate of osmosis; these factors include volume, concentration, and temperature. If all external factors that may interfere with rate of osmosis are controlled, the results will show equal amounts of fluid on both sides of the barrier (membrane); this is known as an “isotonic” state. For this lab I will be using water and sucrose to demonstrate the rate of osmosis. In this lab I will be exploring how temperature impacts the rate of osmosis by placing pieces of potato of equal size in solutions of different temperatures and observing the change in mass of potato after a given period of time.
The extraction efficiency was most successful with dichloroethane as diluents than any others. Stripping study was carried out with hydrochloric acid. The method was applied for the separation of Mo from minerals composed of different kinds of metals. In this experiment molybdenum was determined by drywashing it and was followed by spectrophotometrically analysis as a complex with Tiron at 390 nm. Turel and Patil (1996)  have established a rapid and selective method for the extraction of molybdenum with malachite green into nitrobenzene.
The topic that the scientist has researched is the reaction rate of different particle sizes. In the experiment, the scientist will discover how the particle size of Alka Seltzer affects the rate of chemical reaction with water. The independent variable in the experiment is the particle size of the Alka Seltzer, while the dependent variable is the rate of reaction, or the volume of Carbon dioxide. The volume of carbon dioxide will be measured in ml. Also, a few of the constants in the experiment will be the amount of water, and amount of tablets.
This will be used at the end of the experiment to stain the colonies. Plating of Bottom Layer of Agar: 1. Loosen the cap on the bottle of 1% noble agar and microwave for about 1-2 min. While heating in a microwave, monitor the solution closely to avoid boiling over. Continue heating, while mixing intermittently, until agar is completely dissolved and the solution is clear.
The three laws of gas define the relationship between pressure (P), volume (V), amount of gas (n) and temperature (T). Boyle’s law says that volume increases when pressure decreases. Charles’ law says that volume increases when temperature increases. Avogadro’s law says that volume increases when amount of gas increases. The ideal gas law is the result of combining the three laws of gas.
Experiment 3 was carried out to prove the linear relationship between stiffness, specific stiffness and diameter. The 4th experiment showed the Inverse relationship between Stiffness and (Length) 3 whereas the 5th experiment proved the relationship between Deflection and the Length of the Beams.
Discussion The effect of different concentration on the percentage change in mass while osmosis was observed, and each experiment was performed by calculating the initial and final masses of the potato pieces and the small bag of Visking tube. According to the table 1 and graph 1, the effect of concentration was identified as the concentration of sucrose increase the percentage change in mass of potato also increase because sucrose is hypertonic solution which means that it has a higher amount of particles dissolved in the solution, while a hypotonic solution such as water where there are fewer particles dissolved. When the potato was put in sucrose concentration where the water potential is larger than that of the potato to the sucrose then mass increased. As it can be seen from the graph, the highest percentage change in mass was in the pure water, the percentage was constituted
The liquid holdup increased with increasing disc diameter. The data on gas and liquid holdups were correlated using least squares regression analysis to obtain useful correlations. Keywords: Holdup, angled disc promoter, three phase fluidized bed. Nomenclature dk disc diameter [m] dp particle diameter [m] Dc diameter of the column [m] g acceleration due to gravity [m/s2]
This is because the force acting against the force of gravity (which is the smaller weight) will be increasingly smaller and the mass being acted on by the force of gravity will be increasingly larger. When the difference between the masses is held constant and the total mass is increased the acceleration will likely decrease. This is because the difference in mass relative to the total mass will be decreasing which will result in an increasingly larger force acting against the force of gravity, while the mass being acted on by gravity will be increasingly closer to the relative weight of the other mass. The differences and increases will likely have a linear relationship for each