Tuesday, 22 October 2013


Today, the 18th, we started a new unit, atmosphere. We thought about different questions regarding atmosphere, like: 
Questions and experiments shown on the board.

  • How do I affect my environment? How do humans affect our environment?
  • How can we use our knowledge to make the world better?

First, Mr. Pro asked us if we ever played with air. People answered that they did, and gave examples such as: When you fan yourself or a friend, whistle, air guns, air soft, nerd guns, air guitar, horse noises, balloons, bubbles, etc.

Without atmosphere, we can't breathe, so we tested how long we could hold our breath.

After learning some new things, we did a series of experiments that had to do with atmosphere. They were:

Method 1
  1. Submerge the jar in the container of water until the jar is full of water.
  2. Rotate the jar so its mouth is facing down.
  3. Slowly lift the jar until its mouth is just below the surface of the water.


Method 3
  1. Inflate one of the balloons to a diameter of about 10 cm.  Deflate it.  Do not tie it!
  2. Practice putting the mouth of the balloon over the mouth of the flask.  
  3. Put about 3 scoops of baking soda into the balloon.
  4. Measure 10mL of vinegar using the measuring cyclinder.
  5. Pour the 10mL of vinegar into an Erlenmeyer flask.
  6. Put the balloon over the mouth of the flask.  Empty the baking soda from the balloon into the flask.
  7. Wait and let the balloon fill up with gas.  Shake the flask gently to complete the reaction faster.
  8. Remove the balloon and tie a knot in it.

           Method 2

    1. Put the jar in the water with the length horizontal until half of it is full of water.
    2. Rotate the jar so its mouth faces down and its length is vertical.
    3. Submerge another jar and fill it with water and turn it so its mouth is facing down
    4. Pour the air from the first jar into the second jar               by holding the mouth of the second jar above the first jar. Tilt the first jar so that the air escapes and bubbles up into the second jar. 

                                                                                           Method 4
    1. Inflate a balloon to about the same size as the balloon in Method 2.
    2. Tie a knot in the balloon.
    3. Compare the gas in the first balloon to the second balloon, and write down your observations.
    Method 6

    1. Crumple up half a piece of paper.

    2. Light the paper on fire from the bottom and place it in the jar.

    3. Put the balloon on top of the jar so the mouth is sealed.

    4. Wait until the flame goes out.

    5. Grab and gently pick up the balloon.

     Method 5

    1. Get a big balloon from Mr. Pro.

    2. Inflate the balloon to a size that’s a little wider than the mouth of the jar.

    3. Submerge the balloon into the water and write down your observations.

    For the experiments, we needed a series of things:

    Big box/sink  water container
    2glass jars/ 2 beakers/ 2 graduated cylinders
    erlenmeyer flask (triangular shaped)
    baking soda
    fire source

    To do the experiments, we needed the following skills:

      • use a measuring cylinder to calculate volume of objects
      • know how to fill in a balloon
      • be able to put the right quantity of backing soda in the balloon

      We had very much fun doing them, and some even scared us a little, like a balloon suddenly exploding right on front of the class.

      1 comment:

      1. Marina, overall you have documented the beginning of class and the methods for the experiments really well. To improve you need document a little more content, the skills for the lesson. In addition, you can improve the format and add labels.

        For the holding your breath experiment, we had to be sure to not let any air in or out of our mouths. We also had had to use a projected stopwatch to accurately record the time we could hold our breath.

        For the following section, try copying and pasting the text into a caption. That way it will be easier to format.

        You have documented the method well and given visuals. However, there's no evidence of the main skill for the lesson, which is recording qualitative observations. Go back to your classmates taskbooks and document some of the qualitative observations

        Include the following labels:
        _____ appropriate labels for the post.
        Scribe Post
        Block #
        Unit # - Title
        Your name
        Other relevant labels

        Please make the changes to improve your post!


      Please write positive comments or constructive feedback in full sentences.