Peka Science Year 5

Date	:	22-6-2010
Activity Code	:	5 /4 / 4.1 / 3
Theme	:	Investigating Force and Energy
Topic	:	4 Heat
Learning Outcomes	:	4.1.3 measure temperature using the correct technique.
Aim	:	To investigate the relationship between the time and the temperature of water when is heated and cooled
Apparatus	:	Lighter,labogas,water,wire gauze,glass rod,tripod stand, retort stand and clamp,250ml beaker,stopwatch,thermometer.
Method	:	Set up the apparatus  as shown in the picture. Use the  thermometer to measure themperature of water. Start the stopwatch and heat the water at the same time. Stir the water using a glass rod. Measure the themperature every 2 minutes for ten minutes. Record your observations in the table below as shown. Turn off the labogas and start your stopwatch at the same time. Measure the temperature every 2 minutes for 10 minutes. Record your observations in the table.
Observation	:
Time ( min) ０ ２ ４ ６ ８ １０ Temperature of water when heated (  C  ) ２８ ４６ ６４ ８２ １００ １００ Temperature of water when cooled (  C  ) １００ ８０ ６０ ４０ ２８ ２８
Discussion	:
1. How does the temperature change when water is heated?     Increasing . 2.Give an inference based on the answer you given in question 1.     The water gains heat. 3. How does the temperature change when water is cooled? Why?     Decreasing . The water loses heat. 3. In this investigation, the things you: i) what to change : time ii) what to measure : temperature of water when is heated and cooled iii) what to keep the same : volume of water Conclusion   :    When water is heated, it gains heat and its temperature increases.                           When water is cooled, it loses heat and its temperature decreases.