Observation Lab: Unit 1
Today we did an observation lab. The purpose of this lab was to make observations about changes that occurred when several substances were mixed, also to design controlled experiments to identify the substances responsible for the observed changes. First, we described the substances involved in the lab (see below). Second, we put one teaspoon of calcium chloride, one-half teaspoon of sodium bicarbonate, and 5 mL of phenol red indicator solution into a zip-lock bag. Before mixing the substances, we squeezed out all the air. As the substances mixed, a reaction occurred (figure 1). We observed and recorded the changes that took place in the bag.
 |
| Phenol Red Indicator Solution (Red liquid) |
 |
| Sodium Bicarbonate (White, solid powder) |
 |
| Calcium Chloride (White, bead-like solid) |
Data:
-Color change: yellow-orange
-Began to fizz
-Became warm
-Bag filled with air
To figure out which substances caused which reactions, we conducted some of our own experiments. First, we combined sodium bicarbonate with phenol red and got no reaction besides the color changing to red-pink (figure 2). Next, we combined calcium chloride and phenol red. The mixture turned orange-red and became warm (figure 3). Lastly, we combined calcium chloride, sodium bicarbonate, and water. The mixture fizzed and bubbled (figure 4). By conducting these separate experiments, we were able to discover which substance combinations caused which reactions.
GO CHEMISTRY!
 |
| Figure 1 |
 |
| Figure 2 |
 |
| Figure 3 |
 |
| Figure 4 |
No comments:
Post a Comment