FOOD BATTERY
Basically, this experiment is all about utitlising the acidity in certain food such as lemons to generate electricity. Below is the experimental set-up where the "V" in the circuit represents a multimeter. The next picture shows how the set-up should look like when it has been prepared. A multimeter is a scientific apparatus used to measure electricity in volts, the SI unit of electricity.
A multimeter.
As shown above, both ends of the crocodile clips should be attached to electrodes. Electrodes are electrical conductors which help attach the circuit to a non-metallic objects. In this case, the orange is the non-metallic object. Once we have set-up the experiment, the multimeter should record a reading. The results from my experiment are recorded below:
Food Volts (V)
Orange 0.946
Potato 0. 940
Pear 0.924
In conclusion, these results show that the orange generates more electricity, followed by the potato and pear respectively. The reason behind this? Oranges contain more acid which is why they seem to sting your senses every time you eat them. Therefore, the acid present in the orange reacts to generate more electricity. If you think that fruits and vegetables contain electricity, you are wrong. The secret lies behind the two electrodes which are attached to the orange. The electrodes which are attached to the orange are made up of zinc and copper. Zinc is an active metal, which means that it is very reactive. Therefore, a reaction will take place between the both and electrons will be transferred, causing a generation of electricity. Come to think of it, if a lemon was used, the electricity generated is comparable to that of a calculator battery. Perhaps scientist could use this theory to generate electricity without causing environmental damage.
INSTANT HOT ICE
This experiment deals with supersaturated solution. Firstly, dissolve as much sodium acetate in boiling water. This is essential to the success of the experiment as you will find out later in this post. You can create sodium acetate by mixing baking soda with white vinegar. Next, make sure that all the sodium acetate has been dissolved by the boiling water. Then, pour the solution in a glass bottle. Make sure to remove any traces of solid sodium acetate. Cool the solution in a refrigerator for 30 minutes. In this case, the solute in a normal solution would have crystallised due to the lowering of the temperature which affects the solubility of the solvent. However, as we have a supersaturated solution, it will "supercool" which means going below the normal temperature of crystallisation without every crystallising. Then, pour the supersaturated solution in a Petri dish to enjoy the wonders of instant hot ice. As you pour, you will notice a block of "ice" form.
If this was done in a container, feel the sides of it and you will feel heat. This is because as the solution crystallises, heat is given off during the process. With this, I would like to thank you for reading this post. Enjoy your beautiful sculpture!
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