• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Agar Jelly Experiment Report

Extracts from this document...

Introduction

Aim: To find out the speed of diffusion in agar jelly, when there are three blocks of jelly of different sizes. Material: A container with agar jelly, safety goggle, knife, ruler, stop watch, a glass plate, sodium hydroxide, an indicator. Method: First, we took the block of agar jelly from the container. We placed it onto the glass plate, and took our knife and ruler. We measured and cut the block, making three cubes of different measurements. The smallest one is 1cm by 1cm by 1cm, the second one is 2cm by 2cm by 2cm, and the biggest one is 3cm by 3cm by 3cm. ...read more.

Middle

We also saw, when we cut the cubes that the pink color travelled into the cube, and we saw that at a certain point, there was the separation of pink from the surface, to white, the color of agar jelly. Like I said, we measured the distance between the surface to where the separation line of pink and white color was. This is what we got: 1cm*1cm*1cm 4mm 2cm*2cm*2cm 4mm 3cm*3cm*3cm 4mm Although they were all 4mm, we saw that the smallest cube was almost completely diffused, almost everything was pink. And we saw that the biggest cube was not at all completely diffused; most of it was white inside the cube. ...read more.

Conclusion

The speed of diffusion can be calculated by distance/time. In this experiment, we saw that the distance which the sodium hydroxide traveled was 4mm, and the time we used was 5 minutes. So, 4mm/5min= 0.8mm/minute. Because the speed doesn't change, the smaller the cube, the faster it'll get completely diffused. From this experiment, I can expect that 1cm*1cm*1cm cube jelly will be completely diffused in 6minutes 15seconds, because 1cm/0.8mm*2=6.25min. (times 2 because it diffused from the top and the bottom). In the same way, I calculated that 2cm*2cm*2cm cubed jelly will be completely diffused in 12.5minutes and 3cm*3cm*3cm jelly in 18.75minutes. You can see that 2cm*2cm*2cm jelly will take twice as much time as 1cm cubed one and 3cm*3cm*3cm jelly will take three times as much time as the 1cm cubed block. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Life Processes & Cells section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Here's what a teacher thought of this essay

3 star(s)

3* This is a standard biology laboratory report on diffusion. The layout is standard, however does leave out some key information including an introduction and evaluation, where the biological significance of the experiment should be noted. The method should be written more clearly and include a labelled diagram. The experiment was straight forward with a variety of volumes used, to improve this more agar jelly cubes could have been tested using repeats to more clearly establish the rate of diffusion.

Marked by teacher Cornelia Bruce 01/12/2012

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related GCSE Life Processes & Cells essays

  1. Marked by a teacher

    Potato / Osmosis Experiment.

    5 star(s)

    To help me discover the exact isotonic solution, I decided to do more readings in this area. The entire second set of readings was completed the following day, in exactly the same process previously described for the first set. Another reason for doing extra readings is that the more readings, the more accurate the results.

  2. Marked by a teacher

    BiologY Lab report

    3 star(s)

    Thus a dependant variable . Procedure 1. Firstly take two test tubes and a interconnecting tube with a cork. 2. Now take 15cm3 of yeast (pre- soaked in water). 3. Take 12ml of different types of carbohydrate. 4. Also take a syringe (for measuring the volume of liquids)

  1. Diffusion in Agar Block

    If any of the constant variables are modified during the experiment it will cause an error, e.g. Concentration of Hydrochloric Acid, If 0.1M is used in some parts and 0.5M is used in others it will drastically change the results providing us an incorrect pattern of results.

  2. Investigating the effect of changing the concentration of an acid on the rate of ...

    because there are more pores for the HCl molecules to get into the agar and then move through. The temperature of the agar can alter the diffusion rate, as at a higher temperature the agar will expand, so the "pores" will be bigger, and more HCl can be absorbed.

  1. Lab Research Paper. Just a Pinch of Salt and a Dash of Bacteria: the ...

    The materials needed to carry out Part 6: Making Concentrated Salt Water were: sodium chloride (NaCl), distilled water, a balance, weigh boats, a scoopula, six 200 milliliter beakers, and 36 filter paper disks. Lastly, the materials needed in Part 7: Making Test/Experiment Plates were: the salt water soaked filter paper disks, twelve LB Agar plates, L-spreaders, the E.

  2. Enzyme Reactivity Lab Report

    The colour of the iodine was recorded in a table at the intervals. 9. The experiment was repeated over again but with different temperatures for the water bath between a range of 20oC and 60oC.

  1. Osmosis is defined as 'the movement of water molecules from an area of high ...

    This is the exact opposite of "turgid". The contents of the potato cells shrinks and pulls away from the cell wall. These cells are said to be plasmolysed. When plant cells are placed in a solution, which has exactly the same osmotic strength as the cells, they are in a state between turgidity and flaccidity.

  2. Charateristics Of Life

    The process of cell division, which produces the gametes, is called meiosis. In sexual reproduction, the male and female gametes come together and fuse which means that their cytoplasm and nuclei join together to form a single-cell called a zygote.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work