electromotive series
Học thuậtThân thiện
Definition
- Noun:
- A serial arrangement of metallic elements or ions according to their electrode potentials: The "electromotive series" is a list that orders metals based on their tendency to lose electrons and form positive ions, measured under specific standard conditions.
- A ranking of reduction/oxidation tendencies: The order indicates how readily a metal will be oxidized (lose electrons) or, conversely, how readily its ions will be reduced (gain electrons). A metal higher in the series can reduce the ions of any metal placed below it.
Usage
- The "electromotive series" is used primarily in chemistry and electrochemistry to predict the direction of redox reactions, the feasibility of galvanic cells, and the likelihood of corrosion.
- It is a standard reference tool. When using it, one typically refers to an element's within the series.
Examples
- Noun:
- Zinc is above copper in the electromotive series, meaning it will displace copper ions from a solution.
- The reactivity of metals can be predicted by consulting the electromotive series.
- In the electromotive series, alkali metals like sodium and potassium are at the top, indicating they are strong reducing agents.
Advanced Usage
- "To be high/low in the electromotive series": Describes an element's relative position, which correlates with its reactivity and standard electrode potential.
- Gold is very low in the electromotive series, which explains its resistance to oxidation and corrosion.
- "According to the electromotive series": Used to justify a prediction about a chemical reaction.
- According to the electromotive series, magnesium should react vigorously with dilute acids.
Variants and Related Words
- Electrochemical series: A synonymous term for "electromotive series."
- Activity series: A closely related list focusing on the reactivity of metals with water and acids, often overlapping with the electromotive series.
- Standard electrode potential (E°): The quantitative measurement, in volts, upon which the order in the electromotive series is based.
Synonyms
- Electrochemical series
- Galvanic series (Note: While closely related, the "galvanic series" is typically specific to metals in seawater and is not always identical to the standard electromotive series.)
Related Phrases and Concepts
- Redox reaction: An oxidation-reduction reaction, the type of reaction the series helps predict.
- Displacement reaction: A reaction where a more reactive metal (higher in the series) displaces a less reactive metal from its compound.
- Standard hydrogen electrode (SHE): The reference electrode against which all standard electrode potentials in the series are measured.
Noun
- a serial arrangement of metallic elements or ions according to their electrode potentials determined under specified conditions; the order shows the tendency of one metal to reduce the ions of any other metal below it in the series