PREFACE:

In this lab activity, you will mix 3 unknown substances together in a bag and observe the changes that occur.  There will be both chemical changes and physical changes. Observation skills are crucial for this lab 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 ACCORDING SAFETY

PROCEDURES:    

GOGGLES ARE DONNED 

& NOT REMOVED UNTIL EVERYONE’S LAB CONCLUSION!!!!

1. Add one spoonful of Chemical A (sodium bicarbonate) on the left side of the zip-lock bag.  Describe and record the properties for Chemical A.  

Soft, White, Very smooth

What is it’s formula?

NaHCO₃

List some of the uses of this chemicals?

Used for baking 

1. Add 1 spoonful of Chemical B (Calcium chloride) on the right side of the zip-lock bag.  Do not mix the chemicals.  Describe and record the properties for Chemical B.  
2. Hard, crispy balls, different sizes 

What is it’s formula?

CaCl2

List some of the uses of this chemicals?

Can be used in Madicen

1. How is chemical B different from Chemical A?
2. A is a smoother powder texture while B is a sphere looking clumpy mixture.
3. Look and describe Chemical C (Bromothymol blue).  Record your observations in the space provided below. 
4. Lightweight, dark bluish, toxoid

What is it’s formula?

C27H28Br2O5S

List some of the uses of this chemicals?

Used to test photolyases and reparation

Now you are ready for the observations of change. 

1. Mix a small amount, not all of it, Chemical A with Chemical B in the middle zip-lock bag.  Record observations.  

The chemical were mixed together it looked more soft 

1. Add 10 mL of chemical C into a plastic bag.  QUICKLY remove as much air as possible and then seal it up.  In the first 30 seconds, squeeze the bag in various places to mix the chemicals. What do you observe? Take a photograph and if possible video recording.

when we putted down the blue color it changed to a green color in the beginning and turn to orange after a while, it was warm that is was start feels like burning, and it was very liquidly

1. Detect any temperature changes with your hand.
2. The temperature was very warm inside the bag.
3. After 2 minutes thoroughly record any new observations.
4. After 2 min it just got harder by stick out together.
6. In the space below add at least two photographs of your zip-lock bag.

1. When you are finished, wash all the chemicals down the drain and rinse out the plastic bag. Discard the UNSEALED bag in the correct discard.  DO NOT take off your goggles until everyone in the room has completed the lab.

1. What evidence of chemical change did you observe in the bag? 
2. Temperature change as well as fizzing on the bag that looks like it cannot be reversed
3. What physical changes did you see? Answer in complete sentences.  

 I noticed that the small sphere did not really dissolve and must made the chemicals fizz and turn out zip lock air filled. The color of our mixture did not change anymore after adding chemical C. IT STAYED ORANGE.