Science Lab
Click any element or ion for an animated structure view — or jump straight to a tool below.
Click any element for an animated structure view. Standard atomic weights (IUPAC). New to atoms? Read What Is an Atom?
Click any ion for its formula, charge, molar mass, and — for simple monatomic ions — its animated electron-shell structure. See how ions form in Ionic vs. Covalent Bonds
Element Check
| Element | Left Side | Right Side | Balanced? |
|---|
Type formulas only — capital letter starts each element (e.g. Fe2O3, Ca(OH)2), separate compounds with +, and use -> or = between reactants and products.
Not sure why balancing matters? Read Why Equations Need to Be Balanced
New to the mole concept? Read The Mole and Avogadro's Number
| Element | Count | Atomic Mass | Contribution | % by Mass |
|---|
Enter each element with its mass (grams) or percent composition — either works, only the ratio matters.
| Element | Moles (relative) | Whole-number Ratio |
|---|
Enter any three of the four values — concentration and volume before and after dilution — and the fourth is solved for. Use the same units for both volumes and both concentrations.
Enter any three of P, V, n, T and the fourth is solved for using PV = nRT (R = 0.0821 L·atm/mol·K).
Percent yield = (actual yield ÷ theoretical yield) × 100. Use the same mass units (e.g. both in grams) for both values.
Click any marker for the approximate pH of a familiar substance. Values are commonly-cited classroom approximations — real samples vary.
Refresher: What Is an Atom? The Basics of Atomic Structure
Reaction types explained: The Five Types of Chemical Reactions
Name: _________________________ Date: _______________
