Changing+state

8I Heat transfer

=Changing state=

Recall the meanings of ‘melting’, ‘boiling’, ‘condensing’, freezing’ and ‘evaporating’. Describe what happens to the temperature of a liquid while it is boiling. Describe what happens to the temperature while a liquid freezes. Explain the shape of a graph of temperature against time for a substance being heated or cooled.
 * Objectives (what you will learn this lesson)**


 * Starter**
 * Key term quiz - you are getting towards the end of the topic - how well do you understand the key terms?

> media type="file" key="ES8_Id126_03ani.swf" width="640" height="480" > > media type="file" key="ES8_Id126_07ani.swf" width="640" height="480" > > > media type="file" key="ES8_Id127_05ani.swf" width="640" height="480" >
 * Activities**
 * 1) What are evapouration and condensation? Look at the animation to find out
 * 1) Check your understanding of evapouration and condensation by completing the worksheet Changing state.
 * 1) When a liquid cools to become a solid how does the temperature of the substance change over time? Watch the animation to find out.
 * 1) Measure the cooling curve of wax to see if it matches your scientific ideas.
 * 1) Answer textbook questions 2 - 4 from pages 126-7 of Exploring Science 8.
 * 1) Cooling by evapouration - the view the animation to understand how this happens.
 * 1) Answer textbook questions 5 - 7 from pages 126-7 of Exploring Science 8.
 * 1) Extension: Find out about relative humidity by reading and completing the worksheet,

Review completed classwork / key term quiz
 * Summary**

Download and complete the gapfill on. Once completed print it off and stick it into your exercise book. Alternatively you can copy and complete it in your exercise book if you have a problem printing.
 * Homework**