How did the flaming splint behave when it was inserted into the tube with CO2 (g)?

When a flaming splint is inserted into a tube containing carbon dioxide (CO2), it typically extinguishes immediately. This is because CO2 is a non-combustible gas that does not support combustion, effectively suffocating the flame by displacing oxygen. As a result, the splint will go out, demonstrating that CO2 cannot sustain a flame.