Investigation to Determine the Relationship Between Surface Area and Rate of Oxygen Production
To determine the relationship between surface area and rate of oxygen
production when a potato is placed in hydrogen peroxide (H2O2)
solution.
Background Information
----------------------
Potato contains enzymes such as catalase. Catalase are protein
molecules, which are found in animal and plant cells. Catalase speeds
up specific reactions in the cells. They all have very specific duty,
as each enzyme just performs one particular reaction.
It is able to speed up the decomposition of Hydrogen Peroxide because
the shape of its active site matches the shape of the Hydrogen
Peroxide molecule. This type of reaction where a molecule is broken
down into smaller pieces is called an anabolic reaction.
Variables
---------
In my investigation I will have two types of variables:-
a) Independent variables are variables that I can change. The
independent variable for my investigation is:
Surface area – the more surface area the more chance of collisions and
therefore a quicker reaction.
b) Dependent variable is the variable that is measured. In my
investigation the dependent variable is:
Volume of oxygen gas produced over a period of one minute
Variables that I kept constant are:
Temperature – the rate of reaction depends on the temperature as
enzymes work best at certain temperatures.
Concentration of Catalase (enzyme) – the more concentrated the quicker
the reaction.
Concentration of Hydrogen Peroxide – the more concentrated the quicker
the reaction.
FAIR TEST
---------
I will make my investigation a fair test by controlling variables:
I will make sure that no air gets into the measuring cylinder until
the experiment has started. I will keep the surface area of the potato
the same. I will control the Surface area of the potato by using a
ruler to measure out how much to cut and by using a knife to cut
This lab was done to determine the relationship of gas production to respiration rate. The lab was done with dormant pea seeds and germinating pea seeds. It was done to test the effect of temperature on the rate of cellular respiration in ungerminated versus germinating seeds. We had to determine the change in gas volume in respirometers. This was done to determine how much oxygen was consumed during the experiment. The respirometers contained either germinating, or non-germinating pea seeds. I think that the germinating seeds will have a higher oxygen consumption rate in a room temperature water bath than the non-germinating seeds. My reason for this hypothesis is that a dormant seed would not have to go through respiration because it is not a plant yet. A germinating seed would consume more oxygen because it is growing, and therefore would need to consume oxygen by going through the process of cellular respiration.
This shows that there could be three variables in this experiment, carbon dioxide, water and light energy. So in our case the variable light energy (light intensity) will be used. The equation also shows that if there is more light energy then more glucose and oxygen will be produced.
Osmosis and Diffusion Investigation Aim: To examine the process of osmosis and diffusion. Part A: Step 1: Q1.[IMAGE] Q2. The jiggling motion is visible because the fat globules are constantly being bombarded by smaller particles. [IMAGE] Q3.
The purpose in experimenting with computer simulations was to compare oxygen consumption rates in different mammalian subclasses. We compared monotremes, marsupials, and placental mammals at both warm and cold temperatures. The results supported our hypothesis that when temperature increased, metabolic rate decreased. This was also supported using a student's t-test. We also found that placental mammals had the highest oxygen consumption rates and marsupials had the lowest. We compared oxygen consumption rates in different sized crabs at different temperatures. The results supported our hypothesis that the smaller crab would have a higher rate of consumption. However, in the crabs, as temperature was increased, metabolic rate increased also.
The Effect of Solute Concentration on the Rate of Osmosis Aim: To test and observe how the concentration gradient between a potato and water & sugar solution will affect the rate of osmosis. Introduction: Osmosis is defined as, diffusion, or net movement, of free water molecules from high to low concentration through a semi-permeable membrane. When a substance, such as sugar (which we will be using in the experiment we are about to analyse), dissolves in water, it attracts free water molecules to itself, and in doing so, stops them from moving freely. The effect of this, is that the concentration of (free) water molecules in that environment goes down. There are less free water molecules, and therefore less water molecules to pass across a semi-permeable membrane, through which sugar molecules and other molecules attached to them are too big to diffuse across with ease.
Investigating the Link Between Wavelength of Light and Rate of Photosynthesis PROBLEM = = = = =
Osmosis is the facilitated diffusion of water across the cell membrane of a cell. The inside layer of the cell membrane is hydrophilic, meaning water cannot easily pass through the membrane. The cell membrane has to have aquaporins, which are water channel proteins, that move the water across the membrane. If there is a water and salt solution outside the cell, the salt can enter the cell by diffusion, but the cell membrane is not permeable to the water. Because there is more solute solution inside the cell, there is less water. The aquaporins move the water across the membrane until equilibrium is reached.
First, we had to measure each of the lines (Lines A-J) in inches and centimeters.
Label 3 specimen tubes A B and C. Add your name to all 3. Using a
Diffusion and osmosis in living cells are greatly effected by factors such as solution concentration, temperature, and surface area of the cell. This was studied using agar cubes of different sizes, dialysis tubing, and potato cores to demonstrate how the different factors affect cells. The process of cellular respiration can be altered due to temperature differences. Enzymes also greatly affect the molecular processes that occur. Enzymes are denatured at variety of pH and causes inactivity of the enzyme in the reactions.
An Investigation Into The Effect Of Surface Area on Volume Ratio On The Rate Of Heat Loss Heat loss from an object is affected by its surface area to volume ratio (SA/V). The smaller the SA/V the faster heat is lost by conduction, convection and radiation. Other factors may influence the rate of heat loss by the above physical processes, e.g. insulation type or thickness Task Prepare a detailed written plan for an investigation to determine the effect of vessel size on the rate of heat loss. The investigations can use the normal range of laboratory equipment and should take no more than eighty minutes to complete. Include: · A concise, testable hypothesis, explained by an introduction.
The first step is to gather all the equipment that you will need. You will need a pair of clippers. You can get a clipper kit at Target or Walmart for as cheap as $20, but remember the more expensive, the better the quality which outcomes in a fresher haircut. Most clipper kits come with the clippers, clipper guards, ranging from #.5-#8, oil for the clippers, a pair
We then put the stopwatch on and left them for half an hour. After we weighed each potato tube and recorded our results. We did the experiment twice. We did this to make sure our results were correct. Preliminary method: We did everything the same as in our other experiment except we
The trimming knife is basically used for removing meat from bone. This knife can be used to make thin clean slices and the tip of the blade makes meat trimming a very easy and pleasurable task.
Equipment Potato, Borer, Beakers, Measuring Cylinder, Stopclocks, Distilled Water, Electronic Balance, Salt solutions of various concentrations. Diagram [IMAGE] [IMAGE] [IMAGE] When we leave the potato in the solution for the allocated time, water