Short answers, pulled from the story.
The attack on Pearl Harbor began at 7:48 a.m. Hawaiian time on the 7th of December 1941. The strike lasted approximately ninety minutes and was carried out in two waves launched from six Japanese aircraft carriers.
A total of 2,403 Americans were killed and 1,178 were wounded. Nearly half of the American fatalities resulted from the explosion of the battleship Arizona's forward magazine after it was struck by a modified 16-inch shell.
Japan attacked Pearl Harbor as a pre-emptive strike to prevent the United States Pacific Fleet from interfering with Japanese military expansion into Southeast Asia and the Dutch East Indies. Admiral Yamamoto planned the strike after the United States cut off oil exports to Japan in July 1941, leaving Japan dependent on capturing oil-rich territories in the region.
A total of 353 Japanese aircraft reached Oahu in two waves. The attacking force originally launched 408 aircraft, with 360 assigned to the two attack waves and 48 assigned to defensive patrol duty.
Admiral Nagumo declined to order a third strike for several reasons: American anti-aircraft fire had improved during the second wave, the location of the three absent American carriers was unknown, the task force was low on fuel, and a third wave would have required night carrier landings for which only the Royal Navy had developed techniques. Yamamoto later called the failure to order a third strike a great mistake.
The Hull note was the American counter-proposal delivered on the 26th of November 1941, demanding that Japan completely evacuate China without conditions and conclude non-aggression pacts with Pacific powers. Japan considered the note an ultimatum. The Japanese naval task force had already departed for Pearl Harbor on the 26th of November in Japan, the day before the note was even delivered.