- InChI
- InChI=1S/Si
- InChI Key
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N
- Formula
- Si
- SMILES
- [Si]
- Molecular Weight1
- 28.09
- CAS
- 7440-21-3
- PAff : Proton affinity (kJ/mol).
- BasG : Gas basicity (kJ/mol).
- Cp,gas : Ideal gas heat capacity (J/mol×K).
- Cp,liquid : Liquid phase heat capacity (J/mol×K).
- Cp,solid : Solid phase heat capacity (J/mol×K).
- EA : Electron affinity (eV).
- ΔfH°gas : Enthalpy of formation at standard conditions (kJ/mol).
- IE : Ionization energy (eV).
- Pvap : Vapor pressure (kPa).
- S°gas,1 bar : Molar entropy at standard conditions (1 bar) (J/mol×K).
- csound,fluid : Speed of sound in fluid (m/s).
- S°solid,1 bar : Solid phase molar entropy at standard conditions (J/mol×K).
- 1: Molecular weight from the IUPAC atomic weights tables.
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Physical Properties
| Property | Value | Unit | Source |
|---|---|---|---|
| PAff | 837.00 | kJ/mol | NIST |
| BasG | 814.10 | kJ/mol | NIST |
| EA | [1.39; 1.39] | eV |
|
| EA | 1.39 ± 0.00 | eV | NIST |
| EA | 1.39 | eV | NIST |
| EA | 1.39 ± 0.00 | eV | NIST |
| EA | 1.39 ± 0.01 | eV | NIST |
| ΔfH°gas | 450.00 ± 8.00 | kJ/mol | NIST |
| IE | [8.10; 8.50] | eV |
|
| IE | 8.15 | eV | NIST |
| IE | 8.15 | eV | NIST |
| IE | 8.15 | eV | NIST |
| IE | 8.20 ± 0.50 | eV | NIST |
| IE | 8.15 ± 0.00 | eV | NIST |
| IE | 8.10 ± 0.50 | eV | NIST |
| IE | Outlier 8.50 ± 0.50 | eV | NIST |
| IE | 8.15 | eV | NIST |
| S°gas,1 bar | 167.98 ± 0.00 | J/mol×K | NIST |
| S°solid,1 bar | 18.81 ± 0.08 | J/mol×K | NIST |
Cheméo can also estimate Normal Boiling Point Temperature, Normal melting (fusion) point, Critical Temperature, Critical Pressure, Critical Volume, Enthalpy of vaporization at standard conditions, Standard Gibbs free energy of formation, Acentric Factor, Log10 of Water solubility in mol/l for this compound, but they fall outside the models' validated range, so they are not shown here. Open the prediction tool to compute them on demand.
Temperature Dependent Properties
| Property | Value | Unit | Temperature (K) | Source |
|---|---|---|---|---|
| csound,fluid | [3916.10; 4020.00] | m/s | [1723.00; 1889.00] |
|
| csound,fluid | 3916.10 | m/s | 1723.00 | Temperature Dependence of the Velocity of Sound in Liquid Metals of Group XIV |
| csound,fluid | 3929.00 | m/s | 1748.00 | Temperature Dependence of the Velocity of Sound in Liquid Metals of Group XIV |
| csound,fluid | 3945.90 | m/s | 1755.00 | Temperature Dependence of the Velocity of Sound in Liquid Metals of Group XIV |
| csound,fluid | 3973.30 | m/s | 1789.00 | Temperature Dependence of the Velocity of Sound in Liquid Metals of Group XIV |
| csound,fluid | 3969.00 | m/s | 1795.00 | Temperature Dependence of the Velocity of Sound in Liquid Metals of Group XIV |
| csound,fluid | 3976.30 | m/s | 1823.00 | Temperature Dependence of the Velocity of Sound in Liquid Metals of Group XIV |
| csound,fluid | 4003.00 | m/s | 1852.00 | Temperature Dependence of the Velocity of Sound in Liquid Metals of Group XIV |
| csound,fluid | 4020.00 | m/s | 1889.00 | Temperature Dependence of the Velocity of Sound in Liquid Metals of Group XIV |
Correlations
| Property | Value | Unit | Temperature (K) | Source |
|---|---|---|---|---|
| Cp,gas | [23.03; 23.15] | J/mol×K | [3504.62; 6000.00] |
NIST
|
| Equation | Y = A + B·t + C·t² + D·t³ + E/t², t = T/1000 Y is Cp,gas in J/mol×K, T in K | |||
| Coefficient A | 1.45932e+01 | |||
| Coefficient B | 5.22464e+00 | |||
| Coefficient C | -1.07888e+00 | |||
| Coefficient D | 7.40000e-02 | |||
| Coefficient E | 2.30940e+00 | |||
| Reference | Chase, 1998 | |||
| Comment | F=450.3365, G=190.2494, H=450.0018; Data last reviewed in March, 1967 | |||
| Temperature range, min. | 3504.62 | |||
| Temperature range, max. | 6000.00 | |||
| Cp,gas | 23.03 | J/mol×K | 3504.62 | Calculated Property |
| Cp,gas | 23.09 | J/mol×K | 3781.88 | Calculated Property |
| Cp,gas | 23.11 | J/mol×K | 4059.15 | Calculated Property |
| Cp,gas | 23.12 | J/mol×K | 4336.41 | Calculated Property |
| Cp,gas | 23.11 | J/mol×K | 4613.68 | Calculated Property |
| Cp,gas | 23.09 | J/mol×K | 4890.94 | Calculated Property |
| Cp,gas | 23.08 | J/mol×K | 5168.21 | Calculated Property |
| Cp,gas | 23.08 | J/mol×K | 5445.47 | Calculated Property |
| Cp,gas | 23.10 | J/mol×K | 5722.74 | Calculated Property |
| Cp,gas | 23.15 | J/mol×K | 6000.00 | Calculated Property |
| Property | Value | Unit | Temperature (K) | Source |
|---|---|---|---|---|
| Cp,liquid | [27.20; 27.20] | J/mol×K | [1685.00; 3504.62] |
NIST
|
| Equation | Y = A + B·t + C·t² + D·t³ + E/t², t = T/1000 Y is Cp,liquid in J/mol×K, T in K | |||
| Coefficient A | 2.71960e+01 | |||
| Coefficient B | -1.19831e-10 | |||
| Coefficient C | 5.35326e-11 | |||
| Coefficient D | -6.95661e-12 | |||
| Coefficient E | -4.29437e-12 | |||
| Reference | Chase, 1998 | |||
| Comment | F=40.36163, G=77.37178, H=48.46997; Data last reviewed in March, 1967 | |||
| Temperature range, min. | 1685.00 | |||
| Temperature range, max. | 3504.62 | |||
| Cp,liquid | 27.20 | J/mol×K | 1685.00 | Calculated Property |
| Cp,liquid | 27.20 | J/mol×K | 1887.18 | Calculated Property |
| Cp,liquid | 27.20 | J/mol×K | 2089.36 | Calculated Property |
| Cp,liquid | 27.20 | J/mol×K | 2291.54 | Calculated Property |
| Cp,liquid | 27.20 | J/mol×K | 2493.72 | Calculated Property |
| Cp,liquid | 27.20 | J/mol×K | 2695.90 | Calculated Property |
| Cp,liquid | 27.20 | J/mol×K | 2898.08 | Calculated Property |
| Cp,liquid | 27.20 | J/mol×K | 3100.26 | Calculated Property |
| Cp,liquid | 27.20 | J/mol×K | 3302.44 | Calculated Property |
| Cp,liquid | 27.20 | J/mol×K | 3504.62 | Calculated Property |
| Property | Value | Unit | Temperature (K) | Source |
|---|---|---|---|---|
| Cp,solid | [19.99; 29.23] | J/mol×K | [298.00; 1685.00] |
NIST
|
| Equation | Y = A + B·t + C·t² + D·t³ + E/t², t = T/1000 Y is Cp,solid in J/mol×K, T in K | |||
| Coefficient A | 2.28172e+01 | |||
| Coefficient B | 3.89951e+00 | |||
| Coefficient C | -8.28850e-02 | |||
| Coefficient D | 4.21110e-02 | |||
| Coefficient E | -3.54063e-01 | |||
| Reference | Chase, 1998 | |||
| Comment | F=-8.163946, G=43.27846, H=0.000000; Data last reviewed in March, 1967 | |||
| Temperature range, min. | 298.00 | |||
| Temperature range, max. | 1685.00 | |||
| Cp,solid | 19.99 | J/mol×K | 298.00 | Calculated Property |
| Cp,solid | 22.83 | J/mol×K | 452.11 | Calculated Property |
| Cp,solid | 24.20 | J/mol×K | 606.22 | Calculated Property |
| Cp,solid | 25.14 | J/mol×K | 760.33 | Calculated Property |
| Cp,solid | 25.92 | J/mol×K | 914.44 | Calculated Property |
| Cp,solid | 26.63 | J/mol×K | 1068.56 | Calculated Property |
| Cp,solid | 27.30 | J/mol×K | 1222.67 | Calculated Property |
| Cp,solid | 27.95 | J/mol×K | 1376.78 | Calculated Property |
| Cp,solid | 28.59 | J/mol×K | 1530.89 | Calculated Property |
| Cp,solid | 29.23 | J/mol×K | 1685.00 | Calculated Property |
| Property | Value | Unit | Temperature (K) | Source |
|---|---|---|---|---|
| Pvap | [1.00e-03; 100.37] | kPa | [1908.00; 3538.00] |
The Yaws Handbook of Vapor Pressure
|
| Equation | ln(Y) = A + B/(T + C) Y is Pvap in kPa, T in K | |||
| Coefficient A | 1.80476e+01 | |||
| Coefficient B | -4.74659e+04 | |||
| Coefficient C | -5.98000e+00 | |||
| Temperature range, min. | 1908.00 | |||
| Temperature range, max. | 3538.00 | |||
| Pvap | 1.00e-03 | kPa | 1908.00 | Calculated Property |
| Pvap | 8.75e-03 | kPa | 2089.11 | Calculated Property |
| Pvap | 0.05 | kPa | 2270.22 | Calculated Property |
| Pvap | 0.26 | kPa | 2451.33 | Calculated Property |
| Pvap | 0.98 | kPa | 2632.44 | Calculated Property |
| Pvap | 3.13 | kPa | 2813.56 | Calculated Property |
| Pvap | 8.72 | kPa | 2994.67 | Calculated Property |
| Pvap | 21.61 | kPa | 3175.78 | Calculated Property |
| Pvap | 48.55 | kPa | 3356.89 | Calculated Property |
| Pvap | 100.37 | kPa | 3538.00 | Calculated Property |
| Pvap | [0.13; 99.83] | kPa | [1997.00; 2560.00] |
NIST
|
| Equation | ln(Y) = A + B/(T + C) Y is Pvap in kPa, T in K | |||
| Coefficient A | 2.66279e+01 | |||
| Coefficient B | -5.36706e+04 | |||
| Coefficient C | -1.23133e+02 | |||
| Reference | Stull, 1947 | |||
| Comment | Coefficents calculated by NIST from author's data. | |||
| Temperature range, min. | 1997.00 | |||
| Temperature range, max. | 2560.00 | |||
| Pvap | 0.13 | kPa | 1997.00 | Calculated Property |
| Pvap | 0.34 | kPa | 2059.56 | Calculated Property |
| Pvap | 0.80 | kPa | 2122.11 | Calculated Property |
| Pvap | 1.81 | kPa | 2184.67 | Calculated Property |
| Pvap | 3.90 | kPa | 2247.22 | Calculated Property |
| Pvap | 8.03 | kPa | 2309.78 | Calculated Property |
| Pvap | 15.89 | kPa | 2372.33 | Calculated Property |
| Pvap | 30.31 | kPa | 2434.89 | Calculated Property |
| Pvap | 55.88 | kPa | 2497.44 | Calculated Property |
| Pvap | 99.83 | kPa | 2560.00 | Calculated Property |
Mixtures
Sources
- Cheméo Relay (1.0, beta) Beta: served but experimental, data-limited and below our cross-validation release bar; the Joback value is recommended where available.
- Temperature Dependence of the Velocity of Sound in Liquid Metals of Group XIV
- The heat capacity and entropy of the lithium silicides Li17Si4 and Li16.42Si4 in the temperature range from (2 to 873) K
- KDB
- NIST Webbook
- The Yaws Handbook of Vapor Pressure
Note: Cheméo is only indexing the data, follow the source links to retrieve the latest data. The source is also providing more information like the publication year, authors and more.
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