Exothermic & Endothermic Reactions
This report discusses an experiment to study endothermic and exothermic reactions by conducting a series of practicals. Acids and bases were mixed with each other and were analysed to see if the reaction absorbed or released heat. Magnesium ribbon in hydrochloric acid showed that the reaction released heat, thus confirmed to be exothermic. Sodium thiosulfate and potassium chloride both in water proved to be endothermic and the temperatures both went down by 9°
The experiment had two objectives; to analyse the solution/reactions and record whether the solutions had an endothermic or exothermic reaction. An exothermic reaction is any reaction that releases energy during the reaction. The energy given off can be in various forms such as; heat, light, sound or electricity. In this report the exothermic form is heat. The opposite of an exothermic reaction is an endothermic one, where ‘endo-‘means to absorb or let in energy. This energy can be provided in many forms but it is most typically in the form of heat.
To recognize and classify reactions as exothermic or endothermic.
The hydrochloric acid and magnesium ribbon solution will absorb heat and be defined as endothermic.
Materials and Method
· Safety glasses
· 3 test tubes, test tube rack
· 10mL measuring cylinder
· Steel wool
· Magnesium ribbon
· Hydrochloric acid
· Sodium thiosulfate
· Potassium chloride
Magnesium in hydrochloric acid
1. Pour 10mL of hydrochloric acid into a test tube. Place a thermometer in the test tube and let it settle to room temperature. Record the temperature.
2. Polish a piece of magnesium ribbon with steel wool until it shines on both sides....