20-Pack Unknown Composition Ferrous Ammonium Sulfate Samples, 100g Each, Varying Iron 0.1-13% Racks & Stands_Wintrobe Stands Nine-piece stainless steel slotted mass

Nine-piece stainless steel slotted mass set with a hooked hanger

Claisen adapter in heavy-duty borosilicate glass features two parallel necks with 19/26 sockets for vacuum distillation and chemistry procedures

the elongated proportions matching ray-tracing setups where a tall surface meets a single beam

calculating radius of curvature for round and spherical optical surfaces

Economy-format graphite crystal model showing the layered hexagonal structure and the weak interlayer bonds responsible for graphite's slippery

20-Pack Unknown Composition Ferrous Ammonium Sulfate Samples, 100g Each, Varying Iron 0.1-13% Racks & Stands_Wintrobe Stands Nine-piece stainless steel slotted massTwenty sample pack of 100g ferrous ammonium sulfate unknowns at 0. 1 13% iron, providing investigation material for analytical determination practice in chemistry student coursework.