"a impact" is not correct and usable in written English.
Instead, you could use the phrase "an impact". For example: "The new technology had an impact on the way people communicate."
A: Impact funds should spend more time on developing businesses and entrepreneurs.
8. Price RH, Van Ryn M, Vinokour A: Impact of a Preventive Job Search Intervention on the Likelyhood of Depression Among the Unemployed.
They are already starting to make a impact.
The rulings will have a impact far beyond Iraq.
"The FCO's [previous] advice has had a impact.
a. Impact analysis part 1: how do I estimate the costs of control?
We hypothesise that other factors, which also regulate VEGF-A expression, will be responsible of VEGF-A impact on poor prognosis.
Cherchi, A., Masina, S. & Navarra, A. Impact of extreme CO2 levels on tropical climate: a CGCM study.
Yates KF, Sweat V, Yau PL, Turchiano MM, Convit A. Impact of metabolic syndrome on cognition and brain: a selected review of the literature.
Barrios-Garcia, M. N. & Ballari, S. A. Impact of wild boar (Sus scrofa) in its introduced and native range: a review.
Barnhill A. Impact and ethics of excluding sweetened beverages from the snap program.
