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# The aim of this investigation is to investigate the time that it takes the jelly block to completely dissolve in water.

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Introduction

Jelly Blocks Aim: The aim of this investigation is to investigate the time that it takes the jelly block to completely dissolve in water. I can alter the size of jelly block, the amount of water in the beaker or the temperature of the water and see the time taken for the block to completely dissolve Factors: The main factors for this experiment are: 1. The Size of the jelly block. The size of the jelly block is a vital factor because a jelly block with a larger mass will be built up of more molecules. So if the mass of the block is larger than the dissolving will be much slower because dissolving occurs as the water molecules pull out the jelly molecules. Therefore more jelly molecules will mean that the water has to take a longer time to pull them out. If the mass of the jelly block is small then the time will be less because there are fewer molecules that have to be dissolved. To ensure that this factor works I have to make sure that I keep the amount of water and the temperature of water constant. The problem will be to get the exact amount of water and temperature. To keep the amount of water constant we can use a measuring cylinder. Similarly to obtain a constant temperature of the water we can use a thermometer. This is an easy factor providing you have digital scales, which we do. 2. The amount of water in the container. The amount of water in the container is an important factor because if there is more water in a container then that will mean that there are more water molecules. ...read more.

Middle

Using some matches turn on the gas and light up the Bunsen burner on the safety flame. Be very careful when using fire. When lighting a Bunsen burner always wear safety goggles. Whenever you aren't using the Bunsen burner always put the flame on the safety flame. 7. Now you have to wait till the water reaches the desired temperature of 80oC. In the meantime you can fill the measuring cylinder again to speed up things. 8. As you're checking the temperature occasionally stir the water so that you get the overall temperature as heat always rises. 9. Once the temperature reaches 80oC you do the following things quickly: remove the Bunsen burner from under the beaker and put your jelly block into the water. However when you put the jelly block into the water you have to start timing at the same time. 10. You keep timing until all the jelly is dissolved and everything is liquid. You then note down the time in seconds and milliseconds to be precise into the table. 11. Then using an oven glove you take your beaker and empty out the beaker. Be careful while handling the beaker, as it will be hot. 12. Then you start again and put the water in the beaker and repeat steps 7-11, till you have done the 4 trials with that same amount of mass. 13. Now you use a different mass of jelly and do 4 trials. You do the same for the 3rd mass. NOTE: When you're cutting out the jelly be sure to cut it in such a way that you have some left over incase something goes wrong. ...read more.

Conclusion

This means that mass of the jelly block does affect the time taken for the jelly to dissolve in water. This proves my prediction right as I said "My prediction is that the larger the mass of the jelly block the longer it will take to completely dissolve." Overall my experiment was a fair test as I used the same amount of water; used the same stopwatch; and the same type of water and jelly. However there may be one thing, which could affect my experiment, which was that it was done on a different day and I could have used a different stopwatch. I could also have probably been a bit more accurate in my weighing and instead of just weighing the mass of the jelly block once, I should have done it two or three times, because sometimes the scale is not on zero. If I were given the opportunity to do the experiment again I would try to complete it all on the same day so that there would be no errors. Also I would change the factor that I was investigating because if you're measuring the mass of the jelly block then you are prone to mistakes in the weighing. I would change my factor instead and investigate whether the amount of water affects the time it takes the jelly to dissolve. It will be easier to accurately measure the amount of water and therefore the chances of mistakes are less. The reason for that being that even though you are still measuring the amount of water using a measuring cylinder you are using the same mass of jelly for each experiment. I enjoyed the experiment and I think it was accomplished with success! Arif 8-C Scientific Practical Investigation ...read more.

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