A. Objective The learners should be able to investigate changes that happen in the absence of oxygen. B. Materials ● fire. Activity: TITLE: ABSENCE OF OXYGEN Jar with cover (Jar A) Jar without cover (Jar B) 2 same sized candle (small) Match or lighter Timer Ruler C. Precautionary Measure Remember to handle match or lighter carefully and don't play with it for it can cause D. Procedure 1. Label the jar with cover with Jar A and the jar without cover as Jar B. 2. Light the candles with a match and put the candles in each jar. 3. Record the time when the candles are lighted and the time when the light was put off. 4. Cover the Jar A and observe what will happen. 5. Measure the length of the candles after the flame was put off. 6. Record your findings on the chart below. Jars JAR A JAR B Time of the flame was put off Length of the candle after burning Answer the following questions: 1. Which of the 2 jars was the candle's flame put off first? 2. Which of the two candles has the shortest size? 3. What happen, when you cover the Jar A? 4. When the lighted candle in Jar A was covered, the flame was put off, what is the reason why the candle's flame did not continue to burn? 5. What are the 3 main components in combustion? Doss​

11. Control Group Bart believes that mice exposed to microwaves will become extra Identify the- strong (maybe he's been reading too much Radioactive Man). He decides to perform this experiment by placing 10 mice in a microwave for 10 seconds. He compared these 10 mice to another 10 mice that had not been exposed. His test consisted of a heavy block of wood that blocked the mouse food. He found that 8 12. Independent Variable 13. Dependent Variable 14. What should Bart's conclusion be? out of 10 of the microwaved mice were able to push the block away. 7 out of 10 of the non-microwaved mice were able to do the same. 15. How could Bart's experiment be improved?​

ANSWER:

11. Control Group
12. Independent Variable - Exposure to microwaves
13. Dependent Variable - Ability to push the block of wood
14. Bart's conclusion should be that there is no significant difference in the ability to push the block away between microwaved and non-microwaved mice since a similar percentage in both groups achieved this.

15. Bart's experiment could be improved by increasing the sample size, ensuring random assignment of mice to groups, and using a standardized measure for the mice's ability to push the block. Additionally, Bart should consider using a placebo group to control for psychological factors and biases.

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