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​

whst kind of subtances hydrogen and carbon have​

Answer:

Hydrogen and carbon are both chemical elements that are essential building blocks of many substances.

1. Hydrogen:

- Hydrogen is a highly reactive and flammable gas.

- It forms compounds with various elements, such as water (H2O), hydrogen peroxide (H2O2), and hydrochloric acid (HCl).

- It is a component of many organic compounds, such as carbohydrates, lipids, and proteins.

- It is the primary fuel source for stars, powering fusion reactions in the core of the Sun and other stars.

2. Carbon:

- Carbon is a nonmetallic element and the basis of organic chemistry.

- It is capable of forming four covalent bonds, allowing it to create a wide variety of compounds.

- It is a key component of organic molecules, such as carbohydrates, proteins, lipids, and nucleic acids (DNA and RNA).

- It forms the backbone of hydrocarbons, which are compounds consisting of carbon and hydrogen, including fuels like gasoline and natural gas.

- Carbon is also present in inorganic compounds like carbon dioxide (CO2) and carbonates.