BTEC Level 3 Applied Science Unit 2: Practical Scientific Procedures and Techniques

BTEC Level 3 Applied Science Unit 2: Practical Scientific Procedures and Techniques Learning Aim B: Undertake calorimetry to study cooling curves Introduction The aim of this practical is that we are trying to contrast the rate of cooling between stearic acid and paraffin wax. Both paraffin wax and stearic acid have the same forces of attraction between them. The higher the temperature, the higher the kinetic energy of these molecules and the faster they move around and as the molecules move slower, the forces of attraction will be greater as they will be forming bonds. I will be calibrating the thermometer as I will be check the temperature through boiling water, ice cold bath and room temperature. Equipment list • Beaker • Boiling tube • Thermometer • Stop clock • Clamp, stander • Bunsen burner • Heat resistant mat Drawing of my set up Results table of calibration of the thermometer (practice recording temperatures) Time (sec) Temperature 0 20 This study source was downloaded by from CourseH on :36:58 GMT -05:00 60 80 120 79 180 78 240 77 300 76 360 75 420 74 480 73 540 72 600 71 Calibration of cold water and boiling water Cold water Temperature 1st 19oC 2nd 19oC 3rd 19oC Boiling water Temperature 1st 98oC 2nd 99oC 3rd 100oC Safety precautions Bunsen burner- keep away from distance when heating the substance, which is paraffin wax and stearic acid Boling water- when picking up the boiling test tube, use tongs to pick the hot boiling test tubes containing the substance. Method 1. Put ab