@[email protected]M to Science [email protected]English • edit-25 days ago[Partially incorrect, see comments.] Pens in Spacemander.xyzimagemessage-square151fedilinkarrow-up11.46Karrow-down135
arrow-up11.43Karrow-down1image[Partially incorrect, see comments.] Pens in Spacemander.xyz@[email protected]M to Science [email protected]English • edit-25 days agomessage-square151fedilink
minus-square@[email protected]linkfedilinkEnglish5•4 days agoRegular chalk is calcium carbonate. Crayola’s website says their sidewalk chalk uses calcium sulfate (gypsum as an ingredient in plaster of paris). So they’re both calcium salts.
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Chalk isn’t chalk?
Regular chalk is calcium carbonate. Crayola’s website says their sidewalk chalk uses calcium sulfate (gypsum as an ingredient in plaster of paris).
So they’re both calcium salts.
no