Competitors at the 2014 International Chemicals Olympiad (IChO 2014) sat for a five-hour theoretical examination on July 25, following a five-hour practice test on July 23.

After the test, Karol Rzad from Poland said he felt relieved after the test, which is long and rather difficult, adding that he had tried his best.

A Vietnamese competitor, Do Viet Hung from Tran Phu High School for Gifted Students in Hai Phong City said the theoretical test was not as hard as the practical one. The student also shared his thought that Vietnamese students need more training in practice in order to gain better results at IChO events.

The 46th annual International Chemistry Olympiad (IChO) opened in Hanoi on July 21 with 291 high school students from 77 countries and territories worldwide taking part. This is the first time Vietnam has hosted the event.

The prizes will be announced on July 28.

At the 45th IChO held in Russia from July 15-23, 2013, all four students of the Vietnamese team won medals - one gold and three silvers.-VNA