Mole and Stoichiometry Lab
Moles, mass and balanced equations, built up from the atom.
Mole and Stoichiometry Lab covers the calculation side of high school chemistry. Students begin with molar mass, then use the mole to move between grams, moles and the number of particles. A balance board with real coefficient steppers lets them balance equations while it counts the atoms on each side.
Next they read mole ratios from a balanced equation and carry them through mass-to-mass problems in two or three steps. The last levels bring in the limiting reactant, theoretical and percent yield, and molarity and dilution. Atomic masses are printed with every question that needs them, so no table lookup is needed.
What children practice
- Calculate molar mass from a formula
- Convert between moles, grams and particles
- Balance equations with the smallest whole-number coefficients
- Write mole ratios in lowest terms from a balanced equation
- Solve mass-to-mass problems and find the limiting reactant
- Compute percent yield, molarity and dilution with M1 V1 equals M2 V2
Levels
- Level 1: Molar mass
- Level 2: Moles and particles
- Level 3: Balancing equations
- Level 4: Mole ratios
- Level 5: Mass to mass
- Level 6: Limiting reactant and yield
- Level 7: Molarity and dilution
- Level 8: Course mix
How it works
- Eight levels run from molar mass to molarity, and Level 8 mixes every kind of problem.
- Pictures show atoms, mole bridges, reaction strips, beakers and bars drawn from the same numbers as the question.
- A new level opens when your child has made five right answers and the practice timer is done.
- Typed answers are always exact, so no rounding is needed, and spoken prompts name the substances in words.
Best for: A good fit for grades 10 to 12 in a first chemistry course, for students who find the mole abstract and want to practice the steps in small pieces.
Tip for parents: Ask your child to talk through one problem as a recipe: what do I have, what do I want and which ratio connects them. A clear plan matters more than quick arithmetic here.
Questions parents ask
Which atomic masses does the game use?
The masses are printed with each question that needs them, to one decimal place for most elements, such as 12.0 for carbon and 16.0 for oxygen. Avogadro's number is given as 6.0 times 10 to the 23rd.
Does it include gas volumes?
No. Gas volumes at standard conditions are left to a separate gas laws topic. Solution problems use liters and molarity instead.
How are particle counts entered?
A count is written as a number between 1 and 10 times a power of ten. When the power is 23, the keypad asks only for the number in front.
Ready to try it?
Mole and Stoichiometry Lab is free with a parent account. A parent adds a child profile, and the child's progress is saved.