Presentation on theme: "How Hot Is It? Calorimetry Lab. Agenda Introduction/concept refresher Teacher demo Do the experiment Report your results to me Finish Calorimetry Handout/lab."— Presentation transcript:
How Hot Is It? Calorimetry Lab
Agenda Introduction/concept refresher Teacher demo Do the experiment Report your results to me Finish Calorimetry Handout/lab questions
Materials GOGGLES 1 penny 25ml water Bunsen Burner + Hose Scales Tongs 50 or 100ml plastic beaker Calorimeter 2 Cups/half Cup Cup/Insulating sleeve/lid Thermometer
Why are we doing this? We want to measure the heat produced by the bunsen burner It’s not very effective to hold a thermometer in the flame – it is also not very safe This allows us to measure the energy change indirectly
What energy changes are happening?
Set Up 1. Weigh out 25g of water in a 50 or 100ml plastic beaker 2. Place the beaker inside the calorimeter 3. Set up calorimeter and measure the initial temperature of the water 4. Weigh the penny 5. Hook your bunsen burner up to the gas with a hose
Lab Set up
Safety and Other Instructions Wear goggles any time you are conducting or near any experiment. Tie back any long hair/no scarves Don’t Burn the Calorimeter! – don’t touch the penny or tongs to the styrofoam
Procedure Open vents on the burner, light the bunsen burner, try to get a nice blue flame and inner cone (adjust vents) Take the penny with tongs and hold it in the inner cone of the flame until it reaches thermal equilibrium. Quickly release the penny into the small beaker in the calorimeter. Close the lid and swirl gently/stir with the thermometer. Watch the thermometer and record the temperature when it reaches its highest point. Let water and penny cool to approx room temperature and repeat the experiment 2x for precision To turn off the burner, completely turn off gas supply.
Adjusting the Burner The flame should not be very high, hold the penny at the tip of the inside cone. It is the hottest point. Make sure the vents are open on the burner
Safety and Other Instructions The penny is still hot once you take it off the flame! Instead of using a stir stick you can gently swirl the calorimeter or stir with the thermometer if you do it too vigorously, the water may spill We will do the experiment THREE times for precision
Groups - Day 1 Per 1 Roisin and Panayiota Dennecia and Garnet Dylan and Neeraj Manjima and Billy Nafis and Danielle Michael and Saleh Justin and Chris Rastko and Ertugrul Lucy and Lauren
Groups - Day 1 Per 2 Saad and Christal Chester and Sabbir Calvina and Paul Lisa and Anurag Sandra and Ahmad Varshini and Aidan Suthan and Nishanthan Ryan and Kevin Andre and Audree Shefat and Anusan Tyrell and Victor Janelle and Ananda Geerthan and Aaron Fabiha and Benozir