Science Club Print

DMTSciClub LN2 2013.11.22 ls ADJSHRP0.5 CRPCOLBRI 0.24

DMT Science Club

meets every Friday at 3:30 p.m. in Room 155 

The goal of the Science Club is to practice our science investigative skills of predicting, observing, and explaining using our understanding of principles of science; while participating actively in demonstrations and experiments that are really fascinating!

Thank you to all of you students who came to the latest meeting!  If you have any photos or videos of past events to share, please e-mail This e-mail address is being protected from spambots. You need JavaScript enabled to view it or This e-mail address is being protected from spambots. You need JavaScript enabled to view it .  Thank you!


Friday, December 13:  Water to fruit juice to milk to ginger ale!

The theme of the meeting is chemical changes!  We observed evidences of a chemical change, which occurs when two reactants (starting chemicals of reaction) react to form brand new products (end chemicals of reaction) with properties different from the initial reactants: Colour change, forming a precipitate, and bubbling.

 

  Set up the following four beakers:

  1. 3/4 water, about 33 to 35 mL of the following solution at pH of 9:  To 25 mL of distilled water, add 6.25 g of sodium carbonate, then sodium bicarbonate slowly until no more solid dissolves.
  2. Four to five drops of phenolphthalein indicator.
  3. About 15 mL of the following solution:  To 10 mL of distilled water, add 4 grams of magnesium chloride (or barium chloride), then add more until no more solid dissolves.
  4. Four to five drops of bromothymol blue indicator solution.  If available, add a few crystals of sodium dichromate.   Immediately before the demonstration, add 6 mL of very concentrated hydrochloric acid.

Before pouring the contents of the first beaker into the second,

Describe fully your qualitative physical observations (e.g. colour, clarity, state of matter) of the contents of the first beaker.
Describe fully your qualitative physical observations of the contents of the second beaker.
After the two contents mixed, did a chemical change occur?  If so, identify and describe fully the evidence(s).

Before pouring the contents of the second beaker into the third,

Describe fully your qualitative physical observations (e.g. colour, clarity, state of matter) of the contents of the second beaker.
Describe fully your qualitative physical observations of the contents of the third beaker.
After the two contents mixed, did a chemical change occur?  If so, identify and describe fully the evidence(s).

Before pouring the contents of the third beaker into the fourth,

Describe fully your qualitative physical observations (e.g. colour, clarity, state of matter) of the contents of the third beaker.
Describe fully your qualitative physical observations of the contents of the fourth beaker.
After the two contents mixed, did a chemical change occur?  If so, identify and describe fully the evidence(s).

 


 Friday, November 22:  Liquid Nitrogen - Strawberry ice cream, banana driving nail into wood, oxygen liquified, hot water poured onto liquid nitrogen!

  There were 18 students at the first meeting this year!DMTSciClub LN2 IceCrm 2013.11.22 P1140710 ls ADJSHRP0.5 CRPCOLBRI 0.12

  The theme of the meeting is liquid nitrogen!  It is a liquid at -196 degrees Celsius, that's right!  Liquid nitrogen is dangerous because it can freeze living tissue, but liquid nitrogen can also be used for fun if used safely!

  We made ice cream, enough for 18 students, using whipping cream (2 cups), half-half cream (2 cups), eggs (3), sugar (1/2 cup), strawberry jam (1/2 jar) and liquid nitrogen.  Ice cream made using liquid nitrogen is the smoothest that you'll ever try. 

Was the extremely smooth texture and consistency of the ice cream, made using liquid nitrogen, caused by nitrogen gas?  

Would you be able to please explain clearly, fully, and using your understanding of principles of science, the role of liquid nitrogen in making ice cream with incedibly smooth texture and consistency? 

Raw eggs, most likely containing salmonella bacteria, were added as ingredients.  Would you be able to please explain clearly, fully, and using your understanding of principles of science, why we would not become sick after eating ice cream made with raw eggs and liquid nitrogen?  

 DMTSciClub LN2 banana 2013.11.22 lADJSHRP0.5 CRPCOLBRI 0.15

 We also emersed completely a banana in liquid nitrogen for five minutes.  The frozen banana was used in the attempt to drive a nail through wood.  It worked to a point until the banana shattered! 

Would you be able to please explain clearly, fully, and using your understanding of principles of science, why the banana shattered after it was emersed in liquid nitrogen AND hit the nail? 

  We also placed a clear balloon filled with oxygen gas (thanks to the autoshop) and placed the balloon on the liquid nitrogen.  The balloon shrivelled.  When the balloon was raised in the atmosphere at room temperature, the shrivelled balloon expanded again and a collection of liquid was observed inside the balloon!

Would you be able to please explain clearly, fully, and using your understanding of principles of science, why the   balloon shrivelled when placed in liquid nitrogen?

Would you be able to please explain clearly, fully, and using your understanding of principles of science, why the balloon expanded when placed in the atmosphere at room temperature?

Would you be able to please explain clearly, fully, and using your understanding of princples of science, why liquid was observed inside the balloon after it was placed in liquid nitrogen, then in the atmosphere at room temperature?

 DMTSciClub LN2 2013.11.22 lsADJSHRP0.5 CRPCOLBRI 0.12

 

 

 We also poured hot water, from a metre above, into a bowl containing liquid nitrogen!  A "white cloud" instantly appeared and continued to form!  Shortly afterwards, the liquid remaining was warm!

Would you be able to please explain clearly, fully, and using your understanding of principles of science, the identity of the "white cloud".  Also, explain why the water remaining was warm?

  For next time:  (1) Secure the connection of the orange LED light and submerge it into liquid nitrogen;  (2) Using liquid nitrogen, freeze marshmallows and a raw egg;  (3) Using liquid nitrogen, levitate a neodynium magnet through a copper pipe.

Last Updated on Saturday, 21 December 2013 01:51