We've got Chemistry simple stamping
The base is a standard 8 1/2" x 4 1/4" orchid oases cardstock scored in half.
The bubble bath cardstock is 4 1/2" x 3 1/4" and then embossed with the splatters embossing folder.
On basic white that measures 2 1/4 x 3 1/2" stamp the glassware in orchid oasis (I used azure afternoon as I couldn't find my orchid oasis).
Cut a piece of pool party cardstock the same size and adhere together, offset.
Stamp bubbles on white cardstock and spill over onto pool party. Color mixtures inside glassware as desired and bubbles too!
Attach pool party and white cardstock to bubblebath with dimensionals. Stamp molecules in Orchid Oasis or Azure Afternoon randomly on card base.

Adhere bubble bath to card front.
Cut basic white cardstock 4 3/4" x 3 1/2". Stamp Clipboard , atom model, and " You matter." Color as desired and adhere in card.

Stamp atoms on envelope.
It's A Science Cling Stamp Set (English)
161554
Orchid Oasis 8 1/2" X 11" Cardstock
159267
Basic White 8 1/2" X 11" Cardstock
159276
Bubble Bath 8 1/2" X 11" Cardstock
161718
Stripes & Splatters 3 D Embossing Folders
157980
Azure Afternoon Classic Stampin' Pad
161663