Title: Osmosis in quail eggs Introduction: Osmosis is the net movement of solvent molecules through a partially permeable membrane into a region of higher solute concentration, in order to equalize the solute concentrations on the two sides. Net movement of solvent is from the less concentrated (hypotonic) to the more concentrated (hypertonic) solution, which tends to reduce the difference in concentrations. This effect can be countered by increasing the pressure of the hypertonic solution, with respect to the hypotonic. The osmotic pressure is defined to be the pressure required to maintain equilibrium, with no net movement of solvent. Osmotic pressure is a colligative property, meaning that the osmotic pressure depends on the molar concentration of the solute but not on its identity.
It can be expected that once amylase reacts with the starch, maltose will then be broken down and less starch will be visible and more sugar will be apparent thus causing the solution mixed with iodine to become lighter and lighter. Materials and Methods Materials included: · · Rack of test tubes · Three spot plates · Hot plate · Large beaker for water bath · Amylase · Disposable droppers · Marker · Starch solution · Distilled water · IKI(dropper) · Benedict’s solution Method/Procedure 1. Identification of Starch To be able to identify the presence of starch, it was necessary to make a sample test by using IKI in wells on the spot plate. Three wells on the spot plate were filled with one drop of IKI each. In the first well two drops of water was mixed with the IKI to show what a negative
Aim : To investigate the average different in mass of five quail’s eggs in five different concentration of sodium chloride solution. Research question : How do the five different concentration of sodium chloride solution affect the average different in mass of five quail’s eggs ? Introduction : In this experiment, we are investigating the effect of osmosis when quail’s egg are immersed in different concentration of sodium chloride solution. “When a cell membrane is said to be selectively permeable, it means that the cell membrane controls what substances pass in and out through the membrane. This characteristic of cell membranes plays a great role in passive transport.
Name: Muhammad Izzuddin bin Ab Aziz Class: M11K Title: Investigation of Osmosis in Quail’s egg. Research question: What is the effect of different concentrations of sodium chloride on a de-shelled quail’s egg? Objectives: * To observe the effect of different concentrations of sodium chloride on a de-shelled quail’s egg. * To explain the effects in terms of osmosis. Introduction: Osmosis is the diffusion of a solvent across a membrane to a region of higher solute concentration.
Osmosis is specifically the movement of water through membranes. Since osmosis and diffusion are both part of passive transport, this means that they do not require energy or pumps. There are different environments created due to diffusion. There are hypotonic, hypertonic, and isotonic environments. Hypotonic is when the solution has a lower solute concentration compared to the water potential.
The paper discs were dipped in the samples given, one being a Yeast solution and the other a Catalase solution. After that, the discs were then immersed into the H2O2 solution. The oxygen produced from the enzyme reaction will form on the disc and cause it to float upwards to the surface of the H2O2 solution. Through these procedures we can investigate the effects of substrate concentration on the rate of reaction. We can manipulate the substrate concentration by varying the concentration of H2O2 taken during each trial of the experiment and measure the rate of reaction by measuring the time taken for the paper disc to float to the surface.
water, oxygen, nutrients, cellular waste are transported inside, outside the cell or to different cellular organelles. It is easy to observe diffusion by gently pouring a coloured liquid into water. In this experiment I will examine diffusion of a solution in a jelly-like substance - agar. Because both the solution and the agar are colourless I will use agar that had before been mixed with phenolphthalein. This also colourless substance is a commonly used indicator that changes its colour into pink with the presence of a base.
Introduction All cells have plasma membranes which are selectively permeable meaning only some materials are able to move across it either to enter or exit the cell. The ability of a molecule to cross the plasma membrane depends on its size, hydrophobicity and charge as well as the relative concentration inside and outside of that cell (Biology Department, 2010). When molecules move from high concentration to low concentration it is called diffusion. More specifically when water diffuses across a cell membrane it is called osmosis. If the concentration of water in a cell is lower than the concentration of water in the solute the solution is said to be hypotonic and the cells swell because they will take up water.
I. Title-Osmolarity of Plant Cells II. Introduction- a. Background information-In this lab I conducted an experiment to determine the Osmolarity of plant cells. Osmolarity is defined as, “the number of osmoles of solute per liter of solution.” In this cause the solution was sugar water. 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.
The cell membrane is selectively permeable so that a cell would lose water when placed in a higher solute concentrated environment and gain water when placed in a lower solute concentrated environment because of osmosis. Osmosis does not occur when there is no concentration gradient, meaning that the solute concentration of inside and outside of the cell is the same. The solution is called isotonic when the concentration of the solution is the same as the concentration inside the cell. Hypothesis * As the sucrose concentration of the solution decreases, the percentage change in mass solanum turberosum discs will increase because the greater concentration gradient results in more rapid and intense osmosis. In the solution of isotonic sucrose concentration, solanum turberosum discs will not gain or lose any mass since osmosis would not occur.