Aim
Experiment #1. Determine if a mixture of chalk powder and vinegar is a physical or chemical reaction.
Assumption
We think there will be bubbles forming because the mixture reminds us of the bicabonate of soda and vinegar we tried in elementary school. So we believe that we will see the formation of a gas and that it is a chemical reaction.
Material
-Chalk Powder
-Vinegar
-1 graduated cylinder of 25 ml
-1 beaker of 50 mL
-1 scale
-1 nacelle
-1 spatula
Handling
1-Measure 25 ml of vinegar with a graduated cylinder.
2-Pour the measured vinegar into a beaker.
3-Measure 2g of chalk powder in a boat using a spatula and a scale.
4-Pour the measured chalk powder into the beaker containing the vinegar
5-Observe the reaction.
6-Dispose of the mixture obtained in the recovery tank
7-Rinse the soiled material.
In action
step by step
Measure the vinegar
Pour the powder
Comments
Bubbles formed. Production of a gas. Effervescence.
Analysis
The formation of a gas is one of the 5 possible indications of a chemical change. Our observations therefore tell us that it is a chemical reaction.
Conclusion
By mixing chalk powder and vinegar, bubbles are formed. Since it is the formation of a gas (index of chemical transformation), we conclude that the mixture is a chemical transformation and that new molecules have been formed.