Chemistry, right on the worksheet.

Draw a Lewis structure from a formula, place a Bohr model, look up an element, and keep it all on the worksheet.

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Ask about the exercise

Why is water bent?

The two lone pairs on oxygen push the bonds closer together.

Type formulas properly

Formula: H₂SO₄

Sketch the rest by hand

Tools for the worksheet

Draw molecules from a formula

Look up any element

Turn tables into charts

Type out any equation

Time your study sessions

Drawn from the formula

Molecules are slow to draw neatly with a mouse. In Pappper you type a formula such as C2H6O, or a name, pick the isomer you mean, and choose a Lewis or a skeletal formula. It lands on your page as line art that follows your pen color, and a double-click reopens it to change.

The same goes for atoms: type Na, Fe2+ or Cl- for a Bohr model with the right electrons in each shell. The periodic table is there as well, with a page for each element.

Know what it was drawn from

Molecules with common school formulas come from a tested library. Hypervalent acids such as H₂SO₄ are drawn with the fewest formal charges, the expanded-octet form many schoolbooks use. If your course teaches a different form, draw it that way, because the convention your teacher uses is the one that counts.

Each of these is available for free as its own page, without an account: the Lewis structure generator, the Bohr model generator and the periodic table.

Questions,
answered

Can I add a Lewis structure to a PDF worksheet?

Yes. Open the structural formula tool on your board, type the formula, and place it on the page. You can move and resize it like any other item.

Can it draw ions in a Bohr model?

Yes. Type something like Fe2+ or Cl- and the electrons are worked out for that ion.