what are the crystalline shapes of sucrose, sodium thiocyanate, and aluminum pottasium dulfate dodecahydrate??
According to my Handbook of Chemicsty and Physics, 1969 edition:
sucrose: monoclinic
sodium thiocyanate: rhombic
aluminum potassium sulfate dodecahydrate: cubic or monoclinic
See http://en.wikipedia.org/wiki/Monoclinic
for an example of the monoclinic type
http://scripts.iucr.org/cgi-bin/paper?gl0195
http://www.google.com/search?hl=en&ie=ISO-8859-1&q=crystalline+shape+sodium+thiocyanate
(See the top article summarized here.)
To determine the crystalline shapes of substances, you can refer to their crystal structures, which can be found in crystallographic databases. One widely used database is the Cambridge Structural Database (CSD). However, as an AI text-based bot, I don't have direct access to external sources like databases, and I cannot browse the web in real-time. But I can provide some general information about the crystal structures of the substances you mentioned.
1. Sucrose: Sucrose is a disaccharide commonly known as table sugar. It crystallizes in the monoclinic crystal system, forming elongated prismatic crystals with a characteristic rhombohedral shape.
2. Sodium thiocyanate: Sodium thiocyanate is an inorganic compound. Its crystal structure belongs to the orthorhombic crystal system. Sodium thiocyanate typically forms colorless elongated, needle-like crystals.
3. Aluminum potassium sulfate dodecahydrate: This compound, also known as alum, has a complex crystal structure. It crystallizes in the cubic system. Alum forms large, well-formed octahedral crystals which are often transparent or translucent with a characteristic double refraction effect.
If you need specific and detailed information about the crystal structures, I recommend consulting reliable scientific sources or crystallographic databases such as the Cambridge Structural Database (CSD) or the Inorganic Crystal Structure Database (ICSD).