Dissolving and Energy Changing

Evaluation: The overall outcome of the experiment is really good. We learn new things about endothermic and exothermic reactions and be acquainted with lab more. However during the experiment, there are few flaws groups keep making. First of all, the thermometer flaw; we must record the initial time of the water to know what type of reaction is occurring and read thermometer in on eye level. It’s very crucial if we groups keep making the flaws, the experiment will become unreliable. Secondly, instruments hygiene; we must clean thermometer with water and dry it off with tissues to avoid other solutions to be contaminated and clean the instruments afterward with clean brush and soaps to avoid serious damage.   Conclusion:  This experiment thought us more about exothermic and endothermic reaction. Solutions such as NH4NO3, KCl, Na2CO3, NaNO3, and KNO2 are all endothermic reaction as the Final temperature fall by an average of 2.6°C from the initial temperature of 20-22°C. It proves that the energy from surrounding is absorbed to into the system which is the solutions and breaks the chemical bonds.  The only exothermic is NaOH which final temperature rise by 11°C from its initial temperature. It proves that the energy from the system is unleashed to the surrounding marking a chemical bonding.