Name: Rai'an Harris Exercise 1: Cell Transport Mechanisms and Permeability: Activity 5: Simulating Active Transport Lab Report Pre-lab Quiz Results You scored 100% by answering 4 out of 4 questions correctly. 1. The movement of sodium and potassium maintained by the Na+ -K+ pump You correctly answered: e. requires energy and is against a concentration gradient. 2. The sodium-potassium pump is classified as a(n) You correctly answered: a. antiporter.
This is a diffusion where the movement of water from an area of high water concentration is moved to an area of low concentration. This experiment takes place to measure the diffusion of small molecules throughout dialysis tubing. This tubing acts as a selectively permeable membrane, allowing the larger molecules to pass through, but slowly. When the two solutions on either sides of the membrane are equal and no net movement is detected, the solutions are isotonic. This means that the solutions have the same concentration of solutes.
Experiment 9 - Effects on Vitamin C (with PH) Research Question: How does the change of PH (increase of decrease) effect the amount of vitamin C in a vitamin C solution? Goal of Experiment: Have the opportunity to independently design and perform a scientific study on an aspect of vitamin C decomposition. Hypothesis: I predict that by introducing HCl or NaOH into the vitamin C solution the percentage of vitamin C present in the solution will decrease. Abstract: The purpose of this lab is to determine the effects that changing the PH of a vitamin C solution will have on the concentration of vitamin C. The concentration changes will be calculated after 6 titrations (2 control, 2 with added NaOH, and 2 with added HCl) . Once calculated, these results can be analyzed and will either validate or refute my hypothesis.
Osmolarity involves the movement of water across a cell membrane which is osmosis, this movement of water can be hypertonic; a higher concentration of a solute inside the cell which means the cell loses mass, hypotonic; a lower solute concentration inside the cell than outside which means the cell gains mass, or isotonic; a solute concentration the same as the outside of the cell which means there is no net movement of water. In a hypertonic solution in a cell water will leave the cell in order to balance the solute concentration making the cell shrink, in a hypotonic solution however water will enter the cell to balance the concentration. In an isotonic solution water will not move since both sides are equal in concentration. b. Purpose-The purpose of this lab was to determine the osmolarity of plant cells by using potato cores as the cells and sugar as the solute. c. Hypothesis-My hypothesis was that if the amount of solute increases then the then potato core’s weight decreases.
Introduction: The purpose of this experiment was to determine the Activation Energy of the Hydrogen Peroxide-Iodide reaction. This was found by measuring the rate at which the reaction occurred and plotting this against the natural log of the number of moles of hydrogen peroxide remaining to find the slope. The reaction is carried out in a Potassium Iodide solution, which serves as a catalyst to the reaction. A catalyst is a chemical which increases the rate of a reaction without being consumed. Catalysts operate by decreasing the value of the activation energy for the reaction.
1.2- Important factors affecting osmosis and diffusion would be how concentrated the solution or solute is, the temperature that the environment or the solution is. What your using and also how large the particle is. 1.3- Aim: The aim of the experiment is to document a rhubarb cell under a microscope, using different concentrations of salt-water solution to determine how much the cell decreases in size, volume and shape and to record the difference in cell reduction. (2) 1.4- Hypothesis: This experiment we expect that the rhubarb cells will drastically shrink with the higher concentrations of salt-water solutions. 1.5- Before starting this experiment we didn’t know how drastically the rhubarb cell would shrink, or if this experiment would actually be a success.
To investigate the effect of concentration on the time of reaction between two chemicals: hydrochloric acid (HCl) and sodium thiosulphate (Na2 S2 O3). Introduction In the experiment I am going to investigate the reaction between sodium thiosulphate and different concentrations of hydrochloric acid and how long does this take. I want to find out if the more concentrated the hydrochloric acid does this make the speed of reaction slower or faster? Or does it have no effect? This is the equation of the reaction.
1 mark AND Enzymes function best at their optimum pH, which in this case has been found to be (whatever their results indicate). When enzymes are acting at their optimum level the maximum amount of oxygen gas will be produced. 1 mark AND Enzymes begin to be denatured when the pH of the surrounding environment moves away from the optimum pH. The rate and extent of denaturation increases as the pH value moves away from the optimum pH. 1 mark AND Extreme pH denatures the enzyme, altering the shape of the active site and preventing the enzyme and substrate forming a complex, thereby decreasing the rate of the reactions.
Titration is an operation of a common laboratory method of quantitative chemical analysis, which determines the unknown concentration of a substance in a solution by adding to a standard reagent of known concentration, this is also known as volumetric analysis. In this case C1V1= C2V2 equation was used. pH is defined by the following equation; pH= -log10H+. pH is measured by the amount of H+ ions in the solution in comparison to OH- ions; therefore, a solution with the higher pH will contain higher concentration of OH-. A solution with a pH of 7 would be neutral, while an acidic solution would have a pH of lower than 7.
Topic: Enzyme Activity Aim: To investigate the effect of increasing concentration of hydrogen peroxide on the rate of decomposition of hydrogen peroxide by immobilized catalase in sodium alginate beads Skills Assessed: DCP & CE Qualitative Data: 1. The sodium alginate beads are green in colour. 2. The hydrogen peroxide is a colourless liquid solution. 3.