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Barium chromate

inorganic compound

This entry is made by Compilation and application of scientific encyclopedia entries of "Science Popularization China" to examine.

Barium chromate is an inorganic compound, chemical formula is BaCrO four 。 It is yellow crystalline powder, insoluble in water, flammable when heated, green flame, and decomposes into BaCr above 900 ℃ two O four And Ba three Cr two O six It is mainly used for making pigments, ceramics, glass, safety matches, etc.

On October 27, 2017, the list of carcinogens published by the International Agency for Research on Cancer of the World Health Organization (WHO) was preliminarily sorted out for reference. Chromium (6-valent) compounds were included in the list of Class 1 carcinogens.^[1]

Chinese name: Barium chromate
Foreign name: barium chromate
chemical formula: BaCrO four
molecular weight: two hundred and fifty-three point three two one
CAS login number: 10294-40-3
EINECS login number: 233-660-5
Melting point: 210 ℃ (Disassembly)

Water solubility: Insoluble
Density: 4.5 g/cm³
Appearance: Yellow crystalline powder
Security description: S36/37；S45；S53；S60；S61
Hazard symbol: T
Hazard description: R8；R20/22；R43；R49；R50/53
UN dangerous goods number: one thousand four hundred and seventy-nine

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Physical and chemical properties

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Melting point: 210 ℃ (decomposition)

Density: 4.5g/cm three

Appearance: yellow crystalline powder

Solubility: insoluble in water, dilute acetic acid and chromic acid solution^[2]

Calculate chemical data

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Reference value for drainage parameter calculation (XlogP): None

Number of hydrogen bond donors: 0

Number of hydrogen bond receptors: 4

Number of rotatable chemical bonds: 0

Number of tautomers: 0

Topological molecular polar surface area: 80.3

Number of heavy atoms: 6

Surface charge: 0

Complexity: 62.2

Number of isotope atoms: 0

Determine the number of atomic structure centers: 0

Number of uncertain atomic structure centers: 0

Determine the number of chemical bond structure centers: 0

Number of uncertain chemical bond structure centers: 0

Number of covalent bond units: 2^[2]

purpose

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Mainly used for making pigments, ceramics, glass, safety matches, etc.

security information

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Safety terminology

S36/37：Wear suitable protective clothing and gloves.

Wear appropriate protective clothing and gloves.

S45：In case of accident or if you feel unwell, seek medical advice immediately (show the lable where possible).

In case of an accident or feeling unwell, seek medical advice immediately (show the label if possible).

S53：Avoid exposure - obtain special instructions before use.

Avoid contact and obtain special instructions before use.

S60：This material and/or its container must be disposed of as hazardous waste.

The substance and its container must be disposed of as hazardous waste.

S61：Avoid release to the environment. Refer to special instructions/Safety data sheets.

Avoid releasing into the environment, refer to special instructions/safety receipt instructions.

Risk terminology

R8：Contact with combustible material may cause fire.

Contact with combustible materials may cause fire.

R20/22：Harmful by inhalation and if swallowed.

Harmful by inhalation and if swallowed.

R43：May cause sensitization by skin contact.

Skin contact may cause irritation.

R49：May cause cancer by inhalation.

May cause cancer if inhaled.

R50/53：Very toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment.

It is extremely toxic to aquatic organisms and may cause long-term adverse effects in the aquatic environment.

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