Extraction of Caffeine from Tea Leaves

Is DNA still present after picking fruit or cooking vegetables? Biology scholars extract and collect DNA strands in an impactful lab. Working groups prepare their samples and compare their results to negative and positive standard...

Your chemistry class is sure to love this experiment on column chromatography, as demonstrated with chalk sticks and felt tip markers. Pupils use sidewalk chalk (another inexpensive form of chalk stick) to demonstrate adsorption and the...

Forensic scientists depend on their observation skills to analyze evidence down to the molecular level. Middle and high schoolers practice making observations and predictions with a series of crime scene activities, which includes a...

How does carbon dioxide affect the world's oceans? The final installment in a series of six lessons has pupils research ocean acidification, then conduct an experiment to witness the delicate balance that exists in our seas. Materials...

Here's a lab that may make you rethink that morning cup of coffee. Biology scholars test the effects of caffeine, alcohol, and nicotine on the behavior of zebrafish through an intriguing experiment. Learners observe fish behavior before...

Caffeine is a mild stimulant for the nervous system and in moderation, is not harmful to the body. The narrator discusses sources of caffeine, its chemical make-up, and what it does inside the human body. He also shares the recommended...

You might want to put down your coffee for this one. Discover the science behind this stimulant, its origins, side-effects, and benefits of the most widely used drug: caffeine.

Help! Someone's trying to take my DNA! An interesting lab experiment has scholars use basic materials to extract DNA. By applying ethanol, cold water, and a protease enzyme, like pineapple juice, they pull strands of DNA from peas,...

Students discover the basic structure of DNA and its function in living organisms by conducting an experiment in which they extract DNA from bananas using a lysis buffer solution.

Is your class conducting an experiment that illustrates liquid-liquid extraction? Consider showing this video first so groups know the general steps of the experiment.