What three factors must be present to support combustion? fuel, CO, and ignition fuel, oxygen, and an ignition source fuel, oxygen, and aldehydes radiation, conduction, and convection

## Step 1<br />Combustion is a chemical reaction that involves the rapid oxidation of a substance, usually a hydrocarbon, in the presence of oxygen. This reaction is exothermic, meaning it releases heat and light. <br /><br />## Step 2<br />The three factors that must be present to support combustion are fuel, oxygen, and an ignition source. <br /><br />### **Fuel**: <br />This is the substance that undergoes combustion. It is usually a hydrocarbon, but can also be other substances. <br /><br />### **Oxygen**: <br />This is the oxidizing agent in the reaction. It is necessary for the combustion process to occur. <br /><br />### **Ignition Source**: <br />This is the source of heat that initiates the combustion process. It can be a spark, flame, or any other source of heat. <br /><br />## Step 3<br />The other options provided, such as CO, aldehydes, radiation, conduction, and convection, are not necessary for combustion to occur. CO and aldehydes are products of combustion, not reactants. Radiation, conduction, and convection are methods of heat transfer, not factors that support combustion.