First, we had to listen to our LSS teacher, Mr Low, who gave us instructions on how to perform the experiment. We listened attentively and gathered the necessary apparatus for the experiment:
- Measuring cylinder
- Tissue paper
- Electronic beam balance
- A glass stopper
- String
- Scissors
Next, we had to follow the procedures and make sure that the experiment runs smoothly. Firstly, we had to weigh the glass stopper to determine its mass, M. Next,we need to pour water into the measuring cylinder to about one-third of its depth. Then, we have to note the volume reading, V1.
The following step is to tie the glass stopper with a piece of string and lower it gently into the water and not its volume reading V2. Therefore, the volume of the glass stopper is equal to (V2 - V1). After that, we also have to repeat the experiment with different starting volumes.
We had to plot our results into a table and compare the results of the few experiments we have conducted with different volumes. By recording the answers on a table, we can easily compare the volume of the glass stopper and confirm if the glass stopper is really the volume which we measured in the 1st experiment or are there some mistakes which will be identified by comparing the results of the 3 experiments.
Also, we had to find the density of the glass stopper which was the formula we learned the previous practical, finding the density can be represented like this:
The following step is to tie the glass stopper with a piece of string and lower it gently into the water and not its volume reading V2. Therefore, the volume of the glass stopper is equal to (V2 - V1). After that, we also have to repeat the experiment with different starting volumes.
We had to plot our results into a table and compare the results of the few experiments we have conducted with different volumes. By recording the answers on a table, we can easily compare the volume of the glass stopper and confirm if the glass stopper is really the volume which we measured in the 1st experiment or are there some mistakes which will be identified by comparing the results of the 3 experiments.
Also, we had to find the density of the glass stopper which was the formula we learned the previous practical, finding the density can be represented like this:
This is the formula in which we use to calculate density and we found that the density of our glass stopper is 2250kg/cubic metre. We also learnt about the 2 precautions when handling a measuring cylinder which is crucial for us to use a measuring cylinder properly.
There were also some questions for us to answer and they needed for you to apply the concept of density so that you can get the answer.
This Science Practical lesson was quite enriching and I look forward to the next Science Practical lesson. :D
what are some of the possible sources of error? could you draft the conclusions
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