Betekenis van:
chemical element
chemical element
Zelfstandig naamwoord
- enkelvoudige, ondeelbare grondstof
- any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter
Synoniemen
Hyperoniemen
Hyponiemen
- allotrope
- transuranic element
- argonon
- metal
- nonmetal
- ac
- ar
- arsenic
- astatine
- atomic number 107
- atomic number 5
- atomic number 35
- atomic number 6
- atomic number 17
- atomic number 110
- atomic number 105
- atomic number 9
- atomic number 32
- atomic number 108
- atomic number 2
- atomic number 1
- atomic number 53
- atomic number 36
- atomic number 103
- atomic number 101
- atomic number 10
- atomic number 7
- atomic number 102
- atomic number 8
- atomic number 15
- atomic number 94
- atomic number 86
- atomic number 111
- atomic number 104
- atomic number 106
- atomic number 34
- atomic number 14
- atomic number 16
- atomic number 52
- atomic number 112
- atomic number 116
- atomic number 115
- atomic number 54
- trace element
Voorbeeldzinnen
- Magnesium is a chemical element.
- ‘substance’ means any chemical element and its compounds, with the exception of radioactive substances;
- ‘substance’ means any chemical element and its compounds, with the exception of the following substances:
- All metals shall be reported as the total mass of the element in all chemical forms present in the release.
- This was based on the fact that seamless pipes and tubes represented only a small element in the overall costs of the user industries (including the chemical and petrochemical industries, power stations, the automobile and construction industries).
- The common element in the exclusion of all mineralogical processes from the scope of the Energy Taxation Directive, therefore, is that fuel is being used for the chemical process rather than as heating or motor fuel.
- in respect of heavy oils of heading ex2710 only, treatment with hydrogen, at a pressure of more than 20 bar and a temperature of more than 250 oC, with the use of a catalyst, other than to effect desulphurisation, when the hydrogen constitutes an active element in a chemical reaction.
- (in respect of products of subheadings 27101931 to 27101999 only) treatment with hydrogen at a pressure of more than 20 bar and a temperature of more than 250 °C with the use of a catalyst, other than to effect desulphurisation, when the hydrogen constitutes an active element in a chemical reaction.
- ‘substance’ means a chemical element and its compounds in the natural state or obtained by any manufacturing process, including any additive necessary to preserve its stability and any impurity deriving from the process used, but excluding any solvent which may be separated without affecting the stability of the substance or changing its composition;
- Participants will also receive intensive hands-on training in the preparation of different sample matrices to be analysed by GC with element-selective detectors and by GC/MS in electron impact and chemical-ionisation modes and they will be introduced to a range of extraction, clean-up, and derivatisation procedures.
- substance: means a chemical element and its compounds in the natural state or obtained by any manufacturing process, including any additive necessary to preserve its stability and any impurity deriving from the process used, but excluding any solvent which may be separated without affecting the stability of the substance or changing its composition;
- The main element of the exposure part of the chemical safety report is the description of the exposure scenario(s) implemented for the manufacturer's production, the manufacturer or importer's own use, and those recommended by the manufacturer or importer to be implemented for the identified use(s).
- in respect of heavy oils of heading ex2710 only, treatment with hydrogen, at a pressure of more than 20 bar and a temperature of more than 250 °C, with the use of a catalyst, other than to effect desulphurisation, when the hydrogen constitutes an active element in a chemical reaction.
- It was in this spirit that Article 2(4) of the Directive excluded mineralogical processes. In those processes fuel is considered to be used not as motor fuel or heating fuel, but to support the chemical process. The common element in the exclusion of all mineralogical processes from the scope of the Energy Taxation Directive, therefore, is that fuel is being used for the chemical process rather than as heating or motor fuel. A tax exemption for the processes concerned here [19] would be justified only if it applied to all mineralogical processes across the board, thus ensuring that all mineralogical processes were being treated consistently [20].
- "Stability" (7) means the standard deviation (1 sigma) of the variation of a particular parameter from its calibrated value measured under stable temperature conditions. This can be expressed as a function of time. "States (not) Party to the Chemical Weapon Convention" (1) are those states for which the Convention on the Prohibition of the Development, Production, Stockpiling and Use of Chemical Weapons has (not) entered into force. (See www.opcw.org) "Substrate" (3) means a sheet of base material with or without an interconnection pattern and on which or within which "discrete components" or integrated circuits or both can be located. N.B. 1:"discrete component": a separately packaged "circuit element" with its own external connections.