Chemistry
Atoms and molecules, chemical reactions, acids and bases. You can safely mix even dangerous reagents.
20 experiments
Times include reading the explanation and completing all six steps. Your pace may vary.
Atoms and isotopes
Change protons, neutrons, and electrons to determine elements, mass numbers, and electric charges.
Electron transfer and ions
Compare ions formed by losing or gaining electrons
Ionic compound ratios
By combining positive and negative ions, a compound with a total charge of 0 is created.
Molecular shape and polarity
Compare bond angle and dipole sum according to electron pair arrangement.
Concentration and dilution
Check the change in concentration of the solution by adding solute or water.
Solubility and saturation
Change the temperature and amount of solute and compare the amount dissolved and the remaining solid.
Recrystallization by cooling
Predict the amount of precipitation by cooling a hot saturated solution
Acid–base neutralization
Change the amounts of acid and base to find the remaining ions and neutralization point.
Acid strength and concentration
Compare strong and weak acids of the same concentration and dilution of the same acid.
Acid–base titration
Add base little by little to find the concentration of the unknown strong acid.
Balancing chemical equations
Change the coefficient to make the number of atoms the same before and after the reaction.
Limiting reactants
Change the amount of reactant input and find the product and remaining material.
Precipitation reactions
Mix the two selected aqueous solutions and observe the resulting solid.
Concentration, temperature, and reaction rate
Compare the rate of product increase by changing the conditions one by one.
Catalysts and activation energy
Separate the effect of catalysts on reaction path and speed.
Dynamic equilibrium
After reaching equilibrium, reactants are added and the new equilibrium is observed.
Heating curves and phase changes
Compare the temperature rise section and state change section by adding heat.
Calorimetry
Calculate the change in solution temperature caused by the heat generated from the reaction.
Daniell cell
Connects the movement of electrons and ions in zinc and copper electrodes
Copper electroplating
Compare the mass of copper precipitated by changing the current and time.