Asia-Pacific Forum on Science Learning and Teaching, Volume 9, Issue 1, Article 5 (Jun., 2008) Fatma TÜRK and Muammer ÇALIK Using different conceptual change methods embedded within 5E model: A sample teaching of Endothermic – Exothermic reactions Previous Contents Next

Appendix A

 

After you follow the subsequent directions, answer the following questions in depth

STAGE 1

Story 1: Ali is a guy who has 20 YTL and wants to deal. However he needs 30 YTL to get things that he must buy. He borrows some money to start his new job, but his work does not go as he planed and he loses money. The unhappy ending is that he realizes that he has lost 5 YTL.　

FIRST YEAR

1.  How much money does Ali borrow for starting his new job?

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2.  How much money does Ali have at the end of first year?

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3.  What is the maximum accumulation in this case?

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4.  What is the total change in this case (positive or negative)?

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Story 2: The next year, Ali decides to deal in again with his 15 YTL. But his money is not enough for his new job. So he borrows 25 YTL and buys the required things. All goes as he planed and he makes a profit. The story has a happy ending; he has 30 YTL after paying back his borrowed money (25 YTL)

SECOND YEAR

1.  How much money does Ali need for his new job?

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2.  How much money does Ali make a profit from his job?

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3.  What is the maximum accumulation in this case?

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4.  What is the total change in this case (positive or negative)?

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STAGE 2

Please show how money changes over the course of time on these diagrams

　

STAGE 3

                   

• Match your diagrams with the ones above

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· How does energy change in an endothermic reaction affect its environment (surroundings)?

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· How does energy change in an exothermic reaction impact its environment (surroundings)?

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• What does endothermic reaction mean?

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• What does exothermic reaction mean?

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Based on your experiences, please answer the following questions .

1.   Please list the subsequent phenomena’s types (endothermic or exothermic)

Condensation of rain from water vapor:

Burning sugar:              

Conversion of frost to water vapor:

Cooking an egg:

2. Could you outline what you have learned?

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