1. Endothermic Reaction Investigation – Ammonium Chloride + Water WALT – Explain what an endothermic reaction is and the factors that affect an Endothermic reaction

2. Chemical reactions where HEAT… Is transferred to the surroundings… Indicated by a RISE in temperature Break Break bonds which releases heat energy. Chemical reactions where HEAT… Is transferred from the surroundings … Indicated by a FALL in temperature make Need to make bonds so take in energy, reducing the temperature.

3. Ammonium Chloride + Water What happens when you mix the 2? Take the temperature before and then after http://www.youtube.com/watch?v=GQkJI- Nq3Os

4. You have – various amounts of Ammonium Chloride 0.5g 1.0g 1.5g 2.0g 2.5g 3.0g Measuring cylinder, thermometer and beaker

5. How can you design an investigation to maximise the reduction in temperature ? Using the equation Ammonium Chloride + Water

6. Amount Ammonium Chloride (gm) Vol Water (ml) Keep it Constant Temp before (C) Temp After (C)Temp Difference (C) 0.520ml 1.0 1.5 2.0 2.5 3.0 Add the same amount of water to the Ammonium Chloride.

7. Answer in full sentences in your books 1)What was the best combination for the reduction in temperature in the reaction? 2)If you were to repeat the experiment what would you a)Change? b)Keep the same?