Unlike the NH 4Cl solution, the clock's internal workings do allow electrons through. The electrons can't pass through the cotton or the NH 4Cl solution, however, so they need another route. MnO 2 is willing to take the electrons that zinc gives away, and its side is marked "+". Electrons are negatively charged, and that's why the Zn side of the battery is connected to the "-" of the clock. Zn is keen to give its electrons e - away. To make use of your newly-made battery, assemble the clock. Then insert a bolt plated with zinc Zn-and your battery is ready! Put a cotton cylinder into the cartridge and soak it with ammonium chloride NH 4Cl solution. Pour some of your MnO 2 and C mixture into your battery cartridge. Insert a graphite electrode into a silicone tube. MnO 2 is going to "pull" electrons from zinc Zn, while graphite will allow the electrons to travel through the mixture. Mix some manganese dioxide MnO 2 with graphite C. Substances in non-reclosable packaging should be used up (completely) during the course of one experiment, i.e. A solid table with a heat resistant top should be provided It should be well lit and ventilated and close to a water supply. The area surrounding the experiment should be kept clear of any obstructions and away from the storage of food. Particular attention should be paid to the safe handling of acids, alkalis and flammable liquids. The supervising adult should discuss the warnings and safety information with the child or children before commencing the experiments. The instructions should enable supervisors to assess any experiment to establish its suitability for a particular child. This experimental set is for use only by children over 12 years.īecause children’s abilities vary so much, even within age groups, supervising adults should exercise discretion as to which experiments are suitable and safe for them. Only carry out those experiments which are listed in the instructions. The incorrect use of chemicals can cause injury and damage to health.
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