Three online chemistry tools for calculations and reference

Balancing equations, calculating molar mass and looking up elements involve different kinds of work. These tools handle the repetitive steps while leaving the reasoning visible.

Enter an equation such as Fe + O2 = Fe2O3, inspect the coefficients, then count each element on both sides.

Balancing changes coefficients, not subscripts. Balanced atom counts alone do not establish that incorrectly specified reactants or products form a valid reaction.

Enter H2SO4 and check element counts, molar mass and mass fractions. With brackets, check that the outside multiplier applies to every element inside.

Keep g/mol with the answer. Match atomic-weight values and rounding when comparing with a textbook.

Find an element by name, symbol or category, then inspect its electron configuration, properties or discovery notes. Check units and data notes when comparing melting or boiling points.

Language options help with terminology; symbols and units still need checking.

Use the tools to check answers and reduce repeated calculation. Retain inputs, key steps and units so that a discrepancy can be traced rather than answered with another click.