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​

A student has to travel an hour just to arrive on time for his 7:30 a.m. class. There are instances where he is sometimes caught in traffic. What are the things he must consider in order not to be late? How can mathematics help him in this situation? ( 5 PTS )*​

In order to avoid being late for his 7:30 a.m. class, there are a few things the student can consider and mathematics can certainly help him in this situation. Here are some suggestions:

1. Leave earlier: The student can calculate the ideal departure time by considering the distance he needs to travel and the expected traffic conditions. For example, if the distance takes an average of 1 hour to cover and there is usually heavy traffic, leaving an extra 15-30 minutes earlier might be a good idea. This way, he can account for unexpected delays and still arrive on time.

2. Study traffic patterns: By analyzing historical traffic data or using traffic apps, the student can identify the times when traffic is lighter. By avoiding peak traffic hours, he can reduce the chances of being caught in congestion. Mathematics can help by analyzing the data patterns and identifying trends.

3. Utilize navigation apps: Navigation apps, such as Google Maps or Waze, can provide real-time traffic information and suggest alternative routes to avoid heavy traffic. The student can rely on these apps to guide him along the fastest and most efficient route to his destination.

4. Analyze travel time variability: By monitoring the time taken to commute over several days, the student can determine the average travel time and the variability in the duration of his commute. By understanding the best and worst-case scenarios, he can plan accordingly and ensure he arrives on time.

5. Utilize mathematical models: Mathematical models can help the student plan his departure time based on various factors like distance, average speed, and traffic conditions. These models can help determine the optimal departure time for him to reach his destination in time for class.

By considering these factors and using mathematics to analyze the data and make informed decisions, the student can increase the likelihood of arriving on time for his early morning class, even when faced with traffic challenges.