A place for insight, inspiration, and experiments.
Vernier offers more than 1,000 experiments in biology, chemistry, engineering/robotics, and physics that can help you inspire students and integrate data-collection technology into your STEM classes. We will be featuring at least one of our experiments in each edition of The Caliper.
Note: All three of this month’s featured K–12 experiments are available in our Vernier Graphical Analysis™ Pro app. To support science educators during this unprecedented time, we are extending the free trial period for Graphical Analysis Pro through June 2022.
- Record their heart’s electrical activity
- Determine the time interval between EKG events
- Calculate heart rate based on their EKG recording
“Rate Law Determination of the Crystal Violet Reaction”
In this experiment, students use the Go Direct Colorimeter, Go Direct SpectroVis® Plus Spectrophotometer, Colorimeter, or Go Direct Visible Spectrophotometer to
- Observe the reaction between crystal violet and sodium hydroxide
- Monitor the absorbance of the crystal violet solution with time
- Graph absorbance vs. time, ln absorbance vs. time, and 1/absorbance vs. time
- Determine the order of the reaction
- Determine the rate constant, k, and the half-life for this reaction
- Measure how long it takes sound to travel down and back in a long tube
- Determine the speed of sound
- Compare the speed of sound in air to the accepted value
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