Kenneth Plant, who has been vice president for research at the Federal Home Loan Mortgage Corp., will become president of Capital City Federal savings and Loan Association of Washington on Feb. 1.

He succeeds George J. Boyce, who retired last August after more than a decade as head of the S&L, which has assets of $170 million and six offices in D.C.

Plant has been engaged in analysis and formulation of policies as well as economic forecasting for the Mortgage Corp., and also was a consultant to the Federal Home Loan Bank Board, which regulates the nation's S&L industry.

A resident of Alexandria, he has B.A. and M.A. degrees in economics from Northwestern University and is continuing studies toward a Ph. D. at the University of Chicago.

Dr. Gardner W. Stacy, professor of chemistry at Washington State University, has assumed the presidency of the 115,000 member American Chemical Society.

Stacy succeeds Dr. Anna J. Harrison, who will remain on the society's board of directors.

Stacy has been a member of the society since 1945 and has represented the Washington-Idaho Border section on the governing council from 1957 to 1970.

Stacy was a postdoctoral fellow at Cornell Medical College for two years before he joined the faculty at Washington State University as assistant professor in 1948. He was named associate professor in 1955 and professor of chemistry in 1960.

John A. Blessing Jr. has been named senior vice president business services for Commercial Credit Co. of Baltimore effective Jan. 1. Blessing formerly was president of the Commercial Credit/McCullagh Leasing group. Stephen R. Leskovsky will succeed Blessing as president of the leasing group.

Samuel C. Brown Jr. was promoted to senior vice president of power station engineering and construction for Virginia Electric and Power Co. effective Jan. 1. Vepco also elected William C. Spencer, vice president of power station engineering and construction services; C.M. Jarvis as vice president, public relations, and Randolph D. McIver as vice president, southern division.

Brown joined Vepco in 1953 and has served in a number of capacities, including efficiency engineer, supervisor of mechanical engineering and executive manager of environmental services. He was elected a vice president in 1976.

George M. Chandler has been named associate director of the Office of Proceedings of the Interstate Commerce Commission.

The Office of Proceedings is responsible for preparing decisions in all the commission's formal proceedings.

Chandler has been involved in transportation regulation since 1957 when he joined the ICC as an attorney. His most recent assignment was director of the Policy Review Office -- a post he will retain until a successor is found.

Neal J. Edwards, vice presidentaccount executive of the Washington advertising firm of Ehrlich-Manes & Associates, was recently presented with the Crystal Prism Award by the American Advertising Federation in honor of his "outstanding contributions to the Advertising Club and involvement and dedication to local civic and community activities."