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P Ayaan Ali
K Shashidhar
Cindy Joycee
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In any engineering application, time plays an essential  role. Be it keeping an eye on the reaction time or calculating the efficiency, measuring time accurately is very important in synchronizing different processes. 

In any industrial process, we require transportation of chemicals over long distances. It would be promising if we could use the same mechanisms to measure time and reduce equipment. Chem-E-Tempore tries to accomplish that by giving you a challenging model-making competition to measure time without any electrical components and control a reaction using it.

Make a chemical/mechanical device which works in such a way that an exothermic chemical reaction automatically starts within stipulated time. The energy released should effectively heat the given water (500ml). The final temperature will be measured at the end of 5 minutes after the reaction starts. 

The model should have the following components: 

  1. A compartment/section to hold the reactants of the exothermic reaction.
  2. An automated mechanism (trigger mechanism) to start the reaction after 1 minute and before 3 minutes.
  3. A compartment where the water to be heated (500 ml) is housed with an opening through which a temperature sensor/thermometer can be inserted without any water spilling.
  4. The overall size of the model presented on the event day should be less than 400mm X 400mm X 800mm.                                                                                                                                                                                                                                   

    Restrictions on the chemicals:  

  5. The exothermic reaction cannot involve any petroleum compounds or fossil fuels.

  6. Use of hazardous chemicals like dynamite, fireworks, mercuric chloride, white phosphorous and nitroglycerine, gunpowder, etc are not permitted.
  7. Every participant will have to fill a document for which link will be forwarded one day before ,mentioning  the fuel that they are going to use in order to avoid any hazard.
  8. Poisonous gases like hydrogen cyanide, fluorine, bromine and chlorine etc. should not be emitted from the machine during the event.
  9. There should not be any flames in the model.
  10. For safety, at no point during the operation, should the water (to be heated) boil.
  11. The water to be heated should not be contaminated with any chemicals.
  12. Participants have to bring all the chemicals themselves. Only water will be provided on the event day.
  1. 10% weightage for the accuracy of the time after which the heating reaction starts.
  2. 30% weightage for the temperature rise.
  3. 15% to the design.
  4. 10% weightage for the overview given.
  5. 10% to the total size of the model.
  6. 25% weightage for the operating cost (cost of the chemicals used).

All decisions made will be final and no cribs will be entertained.  

Q.1 When should the reaction start?

It should start automatically after a minute and within 3 minutes(maximum of 5 minutes). The time will be measured using a stopwatch.

Q.2  What chemical reactions can I use?

Any non-toxic and non-flammable exothermic reaction will suffice. Here are a few examples:

  • The catalytic decomposition of hydrogen peroxide using FeCl3, MnO2, etc.
  • The reaction of Aluminium foil with water in the presence of bases like NaOH, KOH, Ca(OH)2, etc.
  • Acid-base neutralization like HCl and NaOH, HNO3 and KOH, etc.

Q.3 Where can I get the chemicals?

For  testing a chemical reaction, one can borrow the chemicals from the chemistry lab after taking due permission from the authorities.

For purchasing chemicals, shops are located near Hanamkonda Bus Stand. Zeal  Chemicals, Aditya Chemicals, etc  are some of them. Participants from colleges other than NIT Warangal will have to get their own chemicals.

Q.4 How do I make the reaction start within the given time?

One can use various mechanical or chemical mechanisms. 

Say, if you have a liquid reactant. It can be placed above a thick and viscous liquid like honey in a syringe.  A certain volume of honey can be emptied within 1-3 minutes. The reactant will start flowing through the syringe once the honey empties completely.

You can also use a pulley mechanism. A weight can be attached to one side of the pulley and to the other side a cork which is restricting the flow of the reactant. As the weight moves down the cork will unleash the reactant into the vessel.

Q.5 How much is the prize money and when will we get it?

Once the event is over, the participants will be awarded the certificates and the money. The prize money will be disclosed at the day of the event.

Q.6 What if one or more criteria specified in the rules' section are not met with?

Teams won't be disqualified for not keeping up with the restrictions, though marks may be deducted. The abstracts don't have to be very detailed. A basic idea of your model will be sufficient.