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SCIENCE 9: Bag of Change

 

PREFACE:

In this activity, you will mix 3 unknown substances together in a bag and observe the changes that occur noting chemical change and physical change. Observation skills are crucial for this investigation.   Watch for changes in state (solid, liquid, gas), colour (use noun-colour description), volume (mL), temperature, and anything else you can detect.   Do not smell any of this substances please.

 

MATERIALS:   PLEASE NOTE WHMIS LABELS AND ACCORDINGLY SAFETY

·        Chemical A (a white solid) ·        Chemical B (a white solid)

·        Chemical C (a blue liquid) ·        50 mL graduated cylinders

·        Plastic bag ·        goggles

 

PROCEDURES:    GOGGLES ARE DONNED & NOT REMOVED UNTIL LAB CONCLUSION!!!!

1. Add one spoonful of Chemical A on the left side of the ziplock bag. Describe and record the properties for Chemical A.  Add 1 spoonful of Chemical B on the right side of the ziplock bag.  Do not mix the chemicals.  Look and describe Chemical C.  Record your observations in the spaces provided below. Observations may include the colour or state of each chemical. Add a photograph of each Chemical in second row below.

 

Chemical A (Sodium bicarbonate)	Chemical B (Calcium chloride)	Chemical C (Bromothymol blue)
Looks like a white powder. They are not transparent. The bag weighed 11.15 grams	The chemical looks a lot like white rock candies. They are solid and are not transparent. The bag with the two chemicals weighed 11.5 grams.	It is a blue liquid. It is stored inside a glass bottle, that seems to have been stained blue on the inside by the liquid. The mixture of chemicals inside the bag weighed about 11.58

 

2. Mix Chemical A with Chemical B in the ziplock bag. Record observations.  Add 10 mL of chemical C into a plastic bag.  QUICKLY remove as much air as possible and then seal it up.
3. In the first 30 seconds, squeeze the bag in various places to mix the chemicals.
4. Detect any temperature changes with your hand.
5. Record as many observations as you can. After 2 minutes record any new observations.
6. Add at least two photographs of your ziplock bag.

 

 

 

 

Observations:   Chemical A has seemed to simply coat chemical B in the white powder. Once I added chemical C, it looked like a virus infecting an organ system. Chemical C made contact with Chemical A and B, then the white powder slowly turned yellow. The temperature changed and seemed somewhat warm in my hands as the reaction was taking place.

PHOTGRAPHS

7. When you are finished, wash all the chemicals down the drain and rinse out the plastic bag.
8. What evidence of chemical change did you observe in the bag? What physical changes did you see?

I didn’t see any type of physical change, but the powder did turn yellow when it made contact with the blue chemical.

 

 

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