The tiny specimen
A microscope record shows cells with nuclei, rigid cell walls, and green chloroplasts. Which sample is most consistent?
Follow the Evidence. Solve the Mystery.
Investigate fictional chemistry cases using recorded observations and simulated tests. No tasting, smelling, mixing, or handling unknown substances is needed.
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A microscope record shows cells with nuclei, rigid cell walls, and green chloroplasts. Which sample is most consistent?
Week of 10/5/2026: The misplaced powder
Week of 10/12/2026: The purple clue
Week of 10/19/2026: The disappearing blue
A fictional lab has three sealed sample records. A white powder dissolved in water conducts electricity strongly, and adding dilute acid to another recorded portion released carbon dioxide. No tasting or handling is involved.
A student’s red-cabbage indicator became pink when mixed with one mystery solution. A meter showed pH 3. Which description best fits?
A blue copper(II) sulfate solution was placed in contact with clean iron. Reddish solid formed and the blue color weakened. Which explanation best fits?
A microscope record shows cells with nuclei, rigid cell walls, and green chloroplasts. Which sample is most consistent?
Two fibers look similar. Evidence A has an infrared signal consistent with amide groups; Evidence B matches cellulose. Which conclusion is justified?
Equal small amounts of strong acid were added separately to pure water and an acetate buffer. The buffer’s pH changed less. What explains this?
In an educational model, blood leaves the lungs carrying oxygen to tissues. Which molecule binds much of that oxygen reversibly?
A paper bridge must hold a small model load without using more paper. Which design change often increases stiffness?