Chemical Reactions Lab

Name of Lab: Chemical Reactions

Guiding Question:

How do we know if a chemical reaction has occured?

Hypothesis:

I know because we can see the physical change, and latter we can see the difference in the chemical change.

Materials:

1. Sodium Carbonate
2. Calcium Chloride
3. Hydrochloric Acid
4. Copper Sulfate
5. Aluminum Foil
6. Zinc Pieces
7. Baking Soda
8. Vinegar (Acetic Acid)
9. Magnesium Tablets
10. Spatula
11. Graduated Cylinders
12. Stirrer
13. Candles
14. Goggles
15. Beakers/Baby food Jar

Data Table:

Reactions	Observation after reaction	Predictions	Observations during reactions	Observation after reaction
Baking soda + Vinegar	No changes when nothing is added	It will fizz up and Overflow	Began to fizz, but barely came over the top	The liquid settled, and a lot less liquid
Sugar+ Heat	Normal without changes	It will melt and become sticky, and caramelized	It began melting and burning, and blackening up	Al burned, some of the suger was sticky, the aluminum foil was all burned and created Carbon
Copper Sulfate + Sodium	Nothing Abnormal	It will most likely fizz, and change color	Only began to change color and also changed shape.	It was blue, and the object was gooey
Zinc piece + HCL	Nothing different	It will change color	Bubbles started forming, and the zinc became darker.	Gave of hydrogen gas, plus the Zinc became black
Calcium Chloride + Sodium	Nothing Abnormal	It will change color	Turning into a witish mixture	Became whit
Copper Sulfate + aluminum	Nothing Abnormal	Change color	Began to change color and replace atoms	Became red
Starch + Iodine	Everything was normal	Change color	Began to change color	Becam Purple

Analysis Of Data:

My prediction was right for most of the Elements. Some of them began to fizz up which is a physical change such as baking soda and vinegar. Others turned into different colors such as Starch combined with Iodine, or Copper Sulfate combined with Aluminum. The products always changed after the chemical reaction ended, it either changed color or it still fizzed a little, but something was the same after the reaction ended the final result had a feature that the starting experiment also had This was that it was calm that it created a new "element." Some of the ways that my hypothesis was right was because of the fizzing and the color change, it also came to a melting point or began to burn, such as the Aluminum Foil and Sugar combined with heat.

Conclusion:

"How do we know if a chemical reaction has occurred?" I believe that I answered this perfectly, "By seeing the physical and chemical change" my hypothesis was correct every single experiment changed and as it was changing i was able to write down how it is changing, and I could only do that because I recognized the physical and chemical change.

Further Inquiry:

I think that this procedure was well done, but I would also change a few things such as putting more of an ingredient, or mix different compounds, but a question that I would certainly ask myself is "How does the amount of one element effect the final result?"