Final answer:
A properly adjusted hot flame results in complete combustion, characterized by a thorough burn of fuel, producing carbon dioxide, water, and releasing heat, rather than incomplete combustion, no combustion, or an explosion.
Step-by-step explanation:
When considering the question of what happens if you have a properly adjusted hot flame, the correct answer is A) Complete combustion occurs. Complete combustion is characterized by a flame that burns blue, indicating that it has enough oxygen to ensure that the fuel is entirely burned, producing carbon dioxide (CO₂), water (H₂O), and releasing heat.
A flame that has been properly adjusted allows for the thorough mixing of gas and oxygen, therefore facilitating complete combustion as opposed to incomplete combustion where less oxygen is available, leading to the production of carbon monoxide (CO) and soot. As such, a properly adjusted hot flame will not result in incomplete combustion (B), no combustion (C), or an explosion (D).