Chemistry: 1000÷6000= 17%, the degree corresponding to the central angle = 1000 ÷ 6000× 360 = 60,
Mathematics: 3000÷6000=50%, the degree corresponding to the central angle = 0.5× 360 = 180,
Physics: 2000÷6000=33%, the degree corresponding to the central angle = 2000 ÷ 6000× 360 = 120,
As shown in the figure: