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    Physical Properties and A Burning Candle

    Uploaded by

    Broderick Bownds
    1. The document describes an experiment to observe the chemical reaction that occurs when burning a candle. Safety precautions are outlined for working with an open flame. 2. The procedure has students make observations at each step, such as the appearance of the unlit candle, the burning candle, and testing substances collected from the burning candle. 3. The conclusions questions have students analyze their observations to identify the phases present, the role of the wick, the substances indicated by chemical tests, and whether the candle reaction gives off or absorbs heat.

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    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd

    Physical Properties and A Burning Candle

    Uploaded by

    Broderick Bownds
    34 views3 pages
    1. The document describes an experiment to observe the chemical reaction that occurs when burning a candle. Safety precautions are outlined for working with an open flame. 2. The procedure has students make observations at each step, such as the appearance of the unlit candle, the burning candle, and testing substances collected from the burning candle. 3. The conclusions questions have students analyze their observations to identify the phases present, the role of the wick, the substances indicated by chemical tests, and whether the candle reaction gives off or absorbs heat.

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    Original Title

    Physical Properties and a Burning Candle

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    1. The document describes an experiment to observe the chemical reaction that occurs when burning a candle. Safety precautions are outlined for working with an open flame. 2. The procedure has students make observations at each step, such as the appearance of the unlit candle, the burning candle, and testing substances collected from the burning candle. 3. The conclusions questions have students analyze their observations to identify the phases present, the role of the wick, the substances indicated by chemical tests, and whether the candle reaction gives off or absorbs heat.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    34 views3 pages

    Physical Properties and A Burning Candle

    Uploaded by

    Broderick Bownds
    1. The document describes an experiment to observe the chemical reaction that occurs when burning a candle. Safety precautions are outlined for working with an open flame. 2. The procedure has students make observations at each step, such as the appearance of the unlit candle, the burning candle, and testing substances collected from the burning candle. 3. The conclusions questions have students analyze their observations to identify the phases present, the role of the wick, the substances indicated by chemical tests, and whether the candle reaction gives off or absorbs heat.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 3

    Physical Properties and a Burning Candle

    Purpose
    Carefully observe and interpret a chemical reaction.

    Equipment
    250-mL beaker watch glass
    125-mL Erlenmeyer flask rubber stopper
    glass square safety goggles
    chemical scoop lab apron

    Materials
    candle wooden splint
    matches aluminum foil
    2-toothpicks cobalt chloride paper
    limewater solution stirring rod

    Safety
    In this experiment, you will be working with an open flame. Tie back long hair and secure loose clothing.
    Also, wear safety goggles and a lab apron at all times when working in the lab. Be sure all matches and
    burned materials are completely extinguished before they are discarded.

    Procedure
    Record observations for each step.

    1. Note appearance, odor, and feel of the unlighted candle

    2. Heat the bottom of the candle and secure it to a cardboard square at your lab station. Light
    the candle and allow it to burn for several minutes. Note any changes. Briefly describe the
    burning candle

    3. Using your stirring rod, transfer a small amount of the melted wax from around the
    flame to the flame. Does it burn? Describe.

    4. Blow out the flame and immediately place a lighted match in the “smoke” about 2 cm above
    the wick. Note the result.

    5. Place a toothpick into the soft candle next to the unlighted wick to
    form a wooden wick. Light the toothpick and note the result.

    6. Make a slit in a small piece of aluminum foil. Light the candle. Place the foil between the
    base of the flame and the liquid in the candle bowl. Note the behavior of the flame.

    7. Invert a 250-mL beaker over the lighted candle. Note


    any substance that collects on the inside of the beaker. Test the liquid
    with cobalt chloride paper.

    8. Invert a 125-mL Erlenmeyer flask over the lighted candle for several
    minutes. Remove the flask, turn it right side up, and add about 10-mL
    the clear limewater solution. Stopper and shake the flask. Note any
    change in the limewater solution. Insert a lighted splint into the flask
    and note what happens.

    Observations and Data

    Step Observations
    1

    8
    Conclusions and Questions
    1. What phases (solid, liquid, and gas) are present in the unlighted candle? In the burning
    candle? Which phase appears to take part in the chemical reaction?

    2. What part does the wick play in the burning of the candle? What properties should the wick
    have? Explain the result when aluminum is placed between the liquid and the wick. Is the
    wick part of the chemical reaction?

    3. What two substances are indicated by the cobalt chloride and limewater tests? Is it possible
    that other substances are produced when the candle burns? Explain.

    4. A source of energy is needed to start the burning of the candle. What energy source is used?
    Did the reaction give off or absorb heat?

    5. Give an example illustrating the difference between observation and interpretation.

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