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Hhow heat transfer is effected when different variables are changed, when boiling water is in a colorimeter

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Introduction

Calorimeters This is a investigation into how heat transfer is effected when different variables are changed, when boiling water is in a colorimeter. Variables These are the variables which are available for me to change: 1. Different insulators e.g. Foam or Cotton Wool, Polystyrene. 2. The temperature of the water at the start of the experiment. 3. Whether or not the calorimeter has a lid on or not. 4. Different conductors e.g. Copper, Wood, other metals. 5. The amount/Volume of water. Prediction These are my predictions for each variable: 1. Different insulators work better than others. Different insulators will have different effects, because of what they are made of, if the material is a metal, it will conduct the heat, a non-metal will insulate the heat, some better then others. 2. If the starting temperature is higher, then I predict it will be higher at the end too, because the energy lasts longer in the hotter water. 3. If the lid isn't on more heat will be lost, because the heat will rise. 4. Different conductors have different effects too. ...read more.

Middle

Using the stopwatch i will time 5 - 1 minute intervals, then using the thermometer measure the temperature at each point. Safety I will take the following safety precautions just in case: 1. I will take care when handling the kettle, I will not fill it over the maximum, or under the minimum to make sure there are no cut-outs or boiling water coming out of the spout, causing scolding. 2. I will also take care when handling the calorimeter because as soon as the hot water has been put in, the copper conducts the heat, and when I touch it, it will transfer the heat energy to my skin, causing burning. I will use a insulator, like gloves to carry the calorimeter and will warn people I am carrying boiling water. 3. I will make sure there are no cracks in the thermometer so that the mercury doesn't come out. 4. When using the measuring cylinder, i will take care when transferring any water, warm or boiling, to make sure spillage doesn't occur, which could also cause burning, and could damage vanished desktops. ...read more.

Conclusion

Although it was timed accurately and matched my predictions, but generally the test was unfair and so should be done again - this time with more people helping so more experiments can be done at one time, making the results more accurate. I could improve the experiment by using the same equipment all the way through the experiment and will try to complete all experiments within one hour, of one day, and to keep the measurements very accurate, I could use a thermostat to monitor and keep the room temperature the same. Conclusion My conclusion is that after 5 minutes of timing and measuring the temperature, the calorimeter with the 100ml water and insulator cools down the slowest and has a general higher temperature compared to the 100ml experiment without the insulator. This matched my prediction. My conclusion of the other half of the experiment is that the more water there is the higher the temperature. This could be simply because the thermometer isn't completely submerged in all the amounts of water. It also has the smallest heat loss. This matched my prediction! The results went in this order: 1.) 20ml 2.) 40ml 3.) 60ml 4.) 80ml 5.) 100ml 6.) 100ml (with insulator) ...read more.

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