Chemical and Physical Changes
The Secret Service recently arrested suspects accused of counterfeiting coins from 1915 valued at $50,000 each. The students act as a forensic scientist to investigate the crime scene and the evidence. Students learn about chemical and physical changes to recreate the methods used to make the coins as evidence for the trial.
- View students results in realtime.
- Cases take 30-90 minutes to complete.
- Student progress is automatically saved.
- Complete in multiple sessions.
Student progress is automatically saved so that STEM Cases can be completed over multiple sessions.
| Level | Description | Estimated Time |
|---|---|---|
| Middle SchoolFree | This version is for middle school classes. | 30-40 min |
Expanded Handbook
Most content from the Expanded Handbook is included in the corresponding STEM Case.
| Level | Description | Estimated Time |
|---|---|---|
| Middle School | The Expanded Handbook covers structure of atoms (protons, neutrons and electrons), electrical charges, and chemical energy, in addition to the concepts covered in the handbook section of the Middle School Case. | 20-25 min |
Cell Energy Cycle
Explore the processes of photosynthesis and respiration that occur within plant and animal cells. The cyclical nature of the two processes can be constructed visually, and the simplified photosynthesis and respiration formulae can be balanced.
世界杯决赛2022about Cell Energy Cycle
Flower Pollination
Observe the steps of pollination and fertilization in flowering plants. Help with many parts of the process by dragging pollen grains to the stigma, dragging sperm to the ovules, and removing petals as the fruit begins to grow. Quiz yourself when you are done by dragging vocabulary words to the correct plant structure.
世界杯决赛2022about Flower Pollination
Growing Plants
Investigate the growth of three common garden plants: tomatoes, beans, and turnips. You can change the amount of light each plant gets, the amount of water added each day, and the type of soil the seed is planted in. Observe the effect of each variable on plant height, plant mass, leaf color and leaf size. Determine what conditions produce the tallest and healthiest plants. Height and mass data are displayed on tables and graphs.
世界杯决赛2022about Growing Plants
Plants and Snails
Study the production and use of gases by plants and animals. Measure the oxygen and carbon dioxide levels in a test tube containing snails and elodea (a type of plant) in both light and dark conditions. Learn about the interdependence of plants and animals.
世界杯决赛2022about Plants and Snails