have formed after the reaction vs was formed after the reaction

Both phrases are correct, but they are used in different contexts. 'Have formed after the reaction' is in the present perfect tense, indicating that the formation is ongoing or has just been completed. 'Was formed after the reaction' is in the past simple tense, indicating that the formation occurred at a specific point in the past.

Last updated: April 01, 2024 • 490 views

This phrase is correct and commonly used in English.

"have formed after the reaction"

This phrase is in the present perfect tense, indicating that the formation is ongoing or has just been completed. It is used to describe a process that started in the past and continues up to the present moment.

Examples:

Crystals have formed after the reaction was completed.
New compounds have formed after the chemical reaction.

Show examples from the web [+]

The planets that have been found... must have formed after the supernova explosion.
evidence that the reaction products of the contaminant, formed after the performance of the detoxification process, do not endanger animal and public health and the environment;
Te present-day town square was formed after the castle was destroyed in 1808.
People think these holes were all formed after the last ice age.
This system allows to eliminate the excess material formed after the welding of the profile.
SIEF A forum, formed after the pre-registration phase, to share data on a given phase-in substance.
The inner pit with the new lava lake formed after the 2002 lateral eruption (fisheye lens).
Even though a new government has been formed after the recent parliamentary elections, responsibility for environmental matters remains with the combined Ministry for the Environment, Physical Planning and Public Works.
A positive signal today will give the new Slovenian Government which is to be formed after the 10 November elections even more encouragement to meet future challenges, especially in the framework of the national accession strategy, with equal success.
5. This Article shall apply mutatis mutandis to undertakings formed after the date of notification of this Directive which take over business already conducted on that date by a legally distinct body.
The European air transport sector was made to suffer disruptions for over a week as a result of the cloud of ash formed after the volcanic eruption in Iceland.
The company has expressed the auspice that the new Greek government, that he will be formed after the elections of next Sunday, resolves the problem in its entirety.
When a Premonstratensian left the monastery to follow the Czech National Church formed after the separation from Rome which had just occurred, Jakob Kern discovered his vocation in this sad event.
Undertakings formed after the dates referred to in Article 18(3) should not be authorised to carry on life assurance and non-life insurance activities simultaneously.
By the way: each crater in the field, which was formed after the impact of air bomb during the World War, created in the field highly accurate circular crater.
Beyond the museum an interesting element is the Covolo: a huge well, 83 metres deep and very charming, formed after the collapse of a cavern whose calcareous rocks were eroded by water: a typical karst phenomenon.
The PM confirmed that a union of Serb municipalities in northern Kosmet will be formed after the local elections in autumn, but that Kosmet Serbs will not be abandoned meanwhile.
Whether you have a group of two men in partnership or an entire nation which is being formed after the conquest of land from another race-it does not matter the size of the group-they enter into certain agreements.
The interposition of the states, rapidly formed after the victory over Germany and Austria, had created a buffer between red Russia and Berlin, Budapest and Munich strongholds, fallen without the chance of getting any help.
His political program was formed after the model of English politician and philosopher John Stewart Mill, whose book "On Freedom" he translated into Serbian in early 1868 and printed it in Vienna with his own preface.

Alternatives:

have been formed after the reaction
have formed as a result of the reaction
have formed following the reaction
have formed subsequent to the reaction
have formed post-reaction

This phrase is correct and commonly used in English.

"was formed after the reaction"

This phrase is in the past simple tense, indicating that the formation occurred at a specific point in the past. It is used to describe a single event that happened after the reaction.

Examples:

The product was formed after the reaction was complete.
A new layer was formed after the chemical reaction.

Show examples from the web [+]

Te present-day town square was formed after the castle was destroyed in 1808.
evidence that the reaction products of the contaminant, formed after the performance of the detoxification process, do not endanger animal and public health and the environment;
By the way: each crater in the field, which was formed after the impact of air bomb during the World War, created in the field highly accurate circular crater.
His political program was formed after the model of English politician and philosopher John Stewart Mill, whose book "On Freedom" he translated into Serbian in early 1868 and printed it in Vienna with his own preface.
The largest, deepest mountain lake (about 14 meters) in the morainic hills of the Lake Garda area, Lake Frassino was formed after the glacier of the Quarternary Era (Middle Riss) slowly withdrew.
This obliges us to support the legally elected government, which was formed after the last elections in accordance with constitutional requirements, and which today is the target of attacks and threats.
An interim government was formed after Ben Ali fled, but the political and economic situation remain unstable.
A revised line-up of Il Giro Strano was formed after Corte dei Miracoli disbanded in 1976. This new group was rather commercial and had little in common with the original band, lasting around two years.
People think these holes were all formed after the last ice age.
This system allows to eliminate the excess material formed after the welding of the profile.
The planets that have been found... must have formed after the supernova explosion.
SIEF A forum, formed after the pre-registration phase, to share data on a given phase-in substance.
The inner pit with the new lava lake formed after the 2002 lateral eruption (fisheye lens).
After the Little Bang, mass was formed.
Even though a new government has been formed after the recent parliamentary elections, responsibility for environmental matters remains with the combined Ministry for the Environment, Physical Planning and Public Works.
A positive signal today will give the new Slovenian Government which is to be formed after the 10 November elections even more encouragement to meet future challenges, especially in the framework of the national accession strategy, with equal success.
5. This Article shall apply mutatis mutandis to undertakings formed after the date of notification of this Directive which take over business already conducted on that date by a legally distinct body.
The European air transport sector was made to suffer disruptions for over a week as a result of the cloud of ash formed after the volcanic eruption in Iceland.
The company has expressed the auspice that the new Greek government, that he will be formed after the elections of next Sunday, resolves the problem in its entirety.
When a Premonstratensian left the monastery to follow the Czech National Church formed after the separation from Rome which had just occurred, Jakob Kern discovered his vocation in this sad event.

Alternatives:

had formed after the reaction
was created after the reaction
came into existence after the reaction
emerged after the reaction
took shape after the reaction

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have formed after the reaction vs was formed after the reaction