"Freeze-Dried+Specimens"

Students discover how fossils are formed, learn why they are important to us and what they can tell us about the Earth's past by casting and painting four life-size fossil replicas based on actual specimens:. 3" shark tooth, 4" crinoid, 3" trilobite and a 3" ammonite.

CAS Number: 7646-93-7
Formula Weight: 136.17
Formula: KHSO4
Density (g/mL): 2.245
Freezing Point (°C): 197
Solubility: Water
Synonyms: Potassium Hydrogen Sulfate
Shelf Life (months): 12
Storage: White

CAS Number: Mixture
Formula Weight: Mixture
Formula: Mixture
Density (g/mL): Approximately 1.0
Boiling Point (°C): Approximately 100
Freezing Point (°C): Approximately 0
Solubility: Water
Shelf Life (months): 36
Storage: Blue

CAS Number: 1309-37-1
Formula Weight: 159.68
Formula: Fe2O3
Density (g/mL): 5.24
Freezing Point (°C): 1565
Solubility: Acids
Synonyms: Ferric Oxide Red
Shelf Life (months): 36
Storage: Green

CAS Number: 7775-14-6
Formula Weight: 174.11
Formula: Na2O4O2
Density (g/mL): 2.500
Freezing Point (°C): 300
Solubility: Water
Synonyms: Sodium Hydrosulfite
Shelf Life (months): 12
Storage: Red

CAS Number: Mixture
Formula Weight: Mixture
Formula: Mixture
Density (g/mL): 8.45-8.86
Freezing Point (°C): 898-1064
Synonyms: Copper-zinc Alloy
Shelf Life (months): 36
Storage: Green

CAS Number: 9000-70-8
Formula Weight: Mixture
Formula: Natural Product
Density (g/mL): >1.0
Boiling Point (°C): Decomposes
Freezing Point (°C): Decomposes
Solubility: Hot Water
Shelf Life (months): 36
Storage: Green

Formula Weight: Mixture
Formula: Mixture
Hazard Info: Irritant
Density (g/mL): 1.0
Boiling Point (°C): 100
Freezing Point (°C): 0
Solubility: Water and Alcohol
Shelf Life (months): 36
Storage: White

CAS Number: Mixture
Formula Weight: Mixture
Density: 0.60—0.75 g/mL
Boiling and Freezing Point: 20—75°C, -73°C:
Solubility: Insoluble in Water
Synonyms: Petroleum Ether/Acetone 9:1
Shelf Life: 36 Months

CAS Number: 6381-79-9
Formula Weight: 165.24
Formula: K2CO3·1.5H2O
Density (g/mL): 2.428
Freezing Point (°C): 891
Solubility: Water
Synonyms: Potash Sesquihydrate
Shelf Life (months): 12
Storage: Green

CAS Number: 8001-25-0
Density (g/mL): 0.910-0.915
Boiling Point (°C): will not boil @ 760 mm
Freezing Point (°C): -6
Solubility: Carbon Disulfide, Chloroform, Ether
Synonyms: Sweet Oil
Shelf Life (months): 36
Storage: Green

CAS Number: 7446-70-0
Formula Weight: 133.34
Formula: AlCl₃
Density (g/mL): 2.44
Boiling Point (°C): 182
Freezing Point (°C): 194
Solubility: Water
Shelf Life (months): 12
Storage: White

CAS Number: 7789-23-3
Formula Weight: 58.10
Formula: KF
Density (g/mL): 2.481
Boiling Point (°C): 1505
Freezing Point (°C): 859
Solubility: Water and Hydrochloric Acid
Shelf Life (months): 36
Storage: Blue

CAS Number: 7647-01-0
Formula: HCl
Density: 1.16 mL
Boiling and Freezing Point: 81.11 to 85°C, -45°C
Solubility: Water
Synonyms: Muriatic Acid, Hydrogen Chloride
Shelf Life: 24 Months

Stains cells an intense blue for ease of visualization in histological specimens.

A set of 15 samples of different materials used to challenge students to identify materials based on measurement of their density. For some specimens this will be straightforward. In other cases, it will lead to a discussion of uncertainty in measurements and data, and to an awareness that different materials may have nearly the same density.