Practical 4.5 Investigation of the effectiveness of different biological washing powders

00:01:59
https://www.youtube.com/watch?v=IaeHe4ihtx4

Résumé

TLDRThis video demonstrates a simple experiment to compare the effects of different washing powder solutions on egg whites. It involves preparing two washing powder solutions by mixing biological washing powder with distilled water, labeling three boiling tubes, and placing egg white cubes into each tube. The experiment measures the changes in size of the egg white cubes after 24 hours, providing insights into the effectiveness of the washing powders used.

A retenir

  • 🧪 Prepare two washing powder solutions: A and B.
  • 💧 Dilute each solution in boiling tubes A and B.
  • 🥚 Cut egg white cubes into 1 cm pieces.
  • ⏲️ Leave the cubes in their respective solutions for 24 hours.
  • 📏 Observe and record size changes.

Chronologie

  • 00:00:00 - 00:01:59

    In this initial experiment, the narrator demonstrates how to create two washing powder solutions by dissolving 3 grams of biological washing powder in 10 cubic centimeters of distilled water, using a glass rod to stir. The two solutions are labeled as solution A and solution B. Subsequently, they prepare three boiling tubes labeled A, B, and C, into which they add 10 cubic centimeters of solution A, solution B, and distilled water, respectively. Finally, the narrator introduces three one-centimeter cubes of hard-boiled egg white into each tube and leaves them at room temperature for 24 hours to observe any changes in the size of the egg white cubes. The experiment aims to record these changes as part of the results.

Carte mentale

Vidéo Q&R

  • What is the purpose of the experiment?

    To compare the effects of different washing powder solutions on egg whites.

  • How long should the egg white cubes be left in the solutions?

    The egg white cubes should be left at room temperature for 24 hours.

  • What should be added to each boiling tube?

    Each boiling tube should contain either washing powder solution A, washing powder solution B, or distilled water.

  • What is the measurement of the egg white cubes used in the experiment?

    The egg white cubes are cut into three small cubes with sides of one centimeter.

  • How do you record the results?

    Note any change in the size of the egg white cube in each tube and record the results.

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Sous-titres
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Défilement automatique:
  • 00:00:00
    [Music]
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    add
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    3 grams of biological washing powder
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    to 10 cubic centimeters of distilled
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    water
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    in a beaker stir the mixture gently with
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    a glass
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    rod this is washing powder solution a
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    repeat the step with another brand of
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    washing powder
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    this is washing powder solution b
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    label three boiling tubes a b
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    and c
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    add 10 cubic centimeters of washing
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    powder solution
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    a
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    washing powder solution b
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    and distilled water into tubes a
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    b and c respectively
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    [Music]
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    cut the egg white of a hard-boiled egg
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    into three small cubes with sides of one
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    centimeter put one cube into each tube
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    and leave the tubes at room temperature
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    for 24 hours
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    note any change in the size of the egg
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    white
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    cube in each tube
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    record the results
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    [Music]
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    you
Tags
  • washing powder
  • experiment
  • egg whites
  • solution
  • biological washing powder
  • distilled water
  • observation
  • record results
  • size change