Biology
Here are the photos illustrating the change in flexibility of the potato strips depending on whether water moved in or out by osmosis:
Salt Solution
- #74 Identifying Sources Of Error
It is very important to understand the difference between experimental errors and 'mistakes'. A mistake is something that you do incorrectly, such as misreading the scale on a thermometer, or taking a reading at the wrong time, or not emptying...
- # 73 Drawing Conclusions And Interpreting Data
Once you have collected, tabulated and displayed your results, you can use them to draw a conclusion. When you are thinking about a conclusion, look right back to the start of your experiment where you were told (or you decided) what you were to investigate....
- #71 Recording Measurements And Other Data
You will often need to construct a table in which to record your measurements, readings and other observations. It is always best to design and construct your results table before you begin your experiment, so that you can write your readings...
- #69 How To Get High Marks In Paper 3 - Variables
Many of the experiments that you will do during your AS course, and usually Question 1 in the examination paper, will investigate the effect of one factor on another. These factors are called variables. Types of variables The factor that you change...
- # 26 Surface Area To Volume Ratios, Investigating Diffusion
As the radius of a cell ? from 1x to 3x (left), the surface area ? from 1x to 9x, and the volume ? from 1x to 27x. Source: Nature Education As a cell increases in size, there is less surface area in proportion to its volume. Relatively there...
Biology
Osmosis Experiment
Here are the photos illustrating the change in flexibility of the potato strips depending on whether water moved in or out by osmosis:
Salt Solution
Sugar Solution
Distilled Water
Remember for homework you need to plot the results and to explain carefully the change in length and flexibility of the potato strips in the different solutions.?
Results:
Look at the following link which explains osmosis
Osmosis
image from wikipedia
- #74 Identifying Sources Of Error
It is very important to understand the difference between experimental errors and 'mistakes'. A mistake is something that you do incorrectly, such as misreading the scale on a thermometer, or taking a reading at the wrong time, or not emptying...
- # 73 Drawing Conclusions And Interpreting Data
Once you have collected, tabulated and displayed your results, you can use them to draw a conclusion. When you are thinking about a conclusion, look right back to the start of your experiment where you were told (or you decided) what you were to investigate....
- #71 Recording Measurements And Other Data
You will often need to construct a table in which to record your measurements, readings and other observations. It is always best to design and construct your results table before you begin your experiment, so that you can write your readings...
- #69 How To Get High Marks In Paper 3 - Variables
Many of the experiments that you will do during your AS course, and usually Question 1 in the examination paper, will investigate the effect of one factor on another. These factors are called variables. Types of variables The factor that you change...
- # 26 Surface Area To Volume Ratios, Investigating Diffusion
As the radius of a cell ? from 1x to 3x (left), the surface area ? from 1x to 9x, and the volume ? from 1x to 27x. Source: Nature Education As a cell increases in size, there is less surface area in proportion to its volume. Relatively there...