Today, we learned about Observations versus Inferences. Also, we watched a video about lab safety.
Zombie Bubbles
Mrs. Friedmann used her "Zombie Bubble" tank to present her demonstration. First, she sprinkled baking soda covering the bottom of the tank. Then, she spilled some vinegar in which caused the substance within to become fizzy.
Observations
1*Baking soda and vinegar = Fizz!
2*Fizz dies down approximately after one minute.
3*The substance smells like vinegar.
4*There was about a quarter inch or 1/2 of a centimeter of liquid at the bottom of the tank, but the rest of the tank was clear and colorless.
5*Bubbles float in the tank.
Inferences
*Based on observation four, there is nothing in the tank except for the liquid at the bottom.
-However, this assumption was tested. Mrs. Friedmann poured more vinegar and baking soda into the bubble tank causing the fizz to greatly increase. Then, she used a bottle of bubbles and started blowing bubbles into the tank. When the bubbles entered the tank, they were actually floating around in mid-air of the container and travelling in an upward-downward trend. Therefore, this result proved that the previous inference made was incorrect.
The revised inference of the previous inference of observation five:
*There is something in the tank, but it is invisible.
Note:
The reaction of the fizz was an indication that carbon dioxide was produced. However, it was not visible to the sight. The bubbles that were blown into the tank showed the presence of the carbon dioxide.
Soon, Mrs. Friedmann used a large spoon and gathered carbon dioxide from the tank. She then put and exposed the collected carbon dioxide into the lit candle of fire. This caused the fire to flicker and eventually be put out once contact was made. This indicated that carbon dioxide was present in the tank. The collected carbon dioxide from the tank extinguished the lit candle demonstrating that this gas was present in the tank.
Lab Safety Video
*Being safe in the lab should be a top priority for a chemistry student working in the lab. It is important to follow all rules and safety precautions in order to have a good learning experience.
Safety Tips:
*Tie long hair back
*Wear safety goggles at all times
*Handle chemicals safely
-Make sure to not have chemicals contact the skin or eyes.
-Use small containers to control easily
*Only mix chemicals when your instructor approves
*Mixing chemicals correctly can prevent accidents
-Add sulfuric acid to water. If done oppositely will result in unsafe boiling of the substance.
*Read and reread instructions 2 to 3 times.
*Make sure you understand directions and read them completely. Ask questions if you have any doubts.
*Follow the instructions exactly as mentioned.
*Use clean glassware
*Accidents occur. Inform your instructor immediately.
-Allow your instructor to clean up any spills.
*Keep chemicals and lab materials away from your face and body.
*Keep a work tray by you since spills occur often.
*Hold bottles with hands over label
*Hold coin top stopper between fingers
*Replace stoppers immediately
*Use a pipette. Do not use your mouth in any way to collect and transfer chemicals.(As Marie Curie)
*Do not set bottles in a position in which they could easily spill.
*Do not touch or smell substances directly. Only light whiffs might be permitted.
*Volatile chemicals should be handled under a fume hood.
*Never pour excess chemicals back into their original bottles. It is better to waste them. Do not contaminate bottles.
*After measuring the reagent, dispose of it.
*When a spill occurs, use a good absorbent to clean the substances. Kitty litter works well but may not be used much in our class.
*Waste residue should properly be disposed.
-broken glassware should be placed in the proper disposal
*Clean up glassware thoroughly when finished.
*Clean chemicals off hands.
*Don't throw anything into the sink unless instructed by teacher.
*Clean up lab station thoroughly. Clean yourself up.
The next scribe post author is Lauren B.
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