Molecule
Free PNG images in the category “Molecule”: 5 files with transparent background, no sign-up.
Molecules in the chemist's notation: an acridine with three fused rings and a nitrogen at the centre, a chromene with its oxygen-bearing ring, a benzene ring with the inner circle and a methyl branch, a drug structure with a pyrrolidine tail and a ball-and-stick model with a red oxygen atom.
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Molecule next to chemistry
In Science & Education, chemistry takes in the whole lab: flasks, reactions, periodic tables, people in goggles. Molecule narrows it to the structures themselves, skeletal formulas and 3D models of specific compounds. When you need to show what a substance is, not how it is handled, look here.
Skeletal formula or 3D model
Line formulas are the working language of chemists: precise, monochrome, ready for a lecture slide, a compound database or a study handout. Ball-and-stick models are more visual and suit a header, a banner or a popular science page. Most formulas here show named compounds, so they are useful for teaching a specific structure.
Accuracy first
A formula is information, so don't flip, crop or rotate it carelessly; a mirrored drawing can depict a different isomer. Make sure atom labels stay legible at your target size. Line drawings are black on transparent: on a dark slide, invert them instead of placing them on a white box.