Tuesday, 10 December 2013

Air Pressure!

Today, the last science class in the semester, was very fun, and we learned lots of things. Mr. Pro started off by giving the diagrams (which were about the carbon cycle) back, and the whole class got at least 80%. For those who don't remember, these are the elements that add and take away CO2:

The following (1-5) add CO2  → atmosphere
Amount of Carbon movement per year /Gigatons from
"Carbon Dioxide in Earth's Atmosphere."
States of matter for carbon
1) Volcanoes
solid → gas
2) Forest fires, both man-made and natural
solid → gas
3) Burning of fossil fuels
solid, liquid, gas → gas
4)Animals breathing
solid, liquid → gas
5) Decomposition of dead plants, phytoplankton, algae, animals
solid, liquid → gas
The following (6-10) remove CO2  ←  atmosphere

6) Land Plants
gas → solid
7) Phytoplankton
gas → solid
8) Ocean water, which CO2  dissolves in and becomes acidic
gas → liquid
9) Algae
gas → solid
10) plants, phytoplankton, corals, animals that become sediment (rock)
gas → solid

The instrument used to measure ammonia
After reflecting about what we did wrong and well in the diagram, Mr Pro showed us how to measure ammonia. The machine used is very interesting, but we didn't have enough ammonia with us, so we took some from the other science class.

The machine needs twenty minutes to work, so while we waited, we chose our question for the Science Fair. There are around 100 possible questions which are displayed for us in the science blog. If you wanted to propose your own question, you needed to fill in a form. Also, if you wanted to do the project with a partner, you needed a form as well.

Mr. Pro putting in the amount of water
that is needed to do the measuring

After all the measuring, Mr. Pro introduced us to six experiments that we needed to do, which all related to air pressure. First, we needed to hypothesise about what we thought would happen in each experiment, and then we should did them, and wrote down some observations. Here are the experiments:

Method A:
Transfer Water with a Straw
  1. Put the straw in the water.
  2. Place your finger or thumb on top of the straw.
  3. Move the straw to another container and let your thumb go.
  4. Try using different objects to seal the straw.  
Method B:
Balloon Cups
  1. Wipe off the balloon.
  2. Inflate the balloon partially.
  3. Pinch the balloon so no air escapes.
  4. Get a partner to put one cup on the end of the balloon.
  5. Inflate the balloon more.  
  6. Predict what will happen to the cups.
Method C:
The Heavy Newspaper
  1. Be sure the ruler is under the newspaper and the ruler is about 2-3 cm from the end.
  2. Strike the ruler with your hand.
  3. Predict what will happen to the newspaper and ruler.
Method D:
The Magic Beaker
  1. Crumble a very small piece newspaper and put it in a small beaker.
  2. Light the newspaper and put it in the beaker.  Do this over a container, so if you drop the glass it doesn’t break.
  3. immediately put your hand over the beaker and seal it.  Be careful not to burn yourself.
Method E:
The Live Balloon
  1. Heat up lots of water using the kettle.
  2. Put the water into the big beaker.
  3. Cool off the test tube by running it under tap water or by putting it in ice water.
  4. Place gently the glass test tube into the beaker.
  5. Predict what will happen to the balloon on top of the glass test tube.
Method F:
The Candle Under the Jar
  1. Get a timer ready.
  2. Predict how long each candle will burn under each containers.
  3. Light the candles and simultaneously put the containers on top.
  4. Record the time at which each flame goes out.
  5. Predict which container will burn the longest.

Experiment A
Experiment B

Experiment E
Experiment F

Always use safety goggles!
The skills we used:

  • Using the instrument for measuring ammonia
  • Using safety goggles
  • Writing down observations
  • Working with partners

                             Have a great Christmas and a happy New Year!

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