combustion and flame 8th

what is spontaneous combution?

• Spontaneous combustion is the ignition of a material without an external flame or spark.
• Spontaneous combustion requires a direct flame to ignite.
• It is a chemical reaction that occurs only in liquids.
• Spontaneous combustion is the result of electrical sparks.

Is kerosene a spontaneous combustion

What is combustion?

• Combustion is a process that cools down substances.
• Combustion is a slow reaction that occurs without oxygen.
• Combustion is a rapid chemical reaction between a fuel and oxygen that produces heat and light.
• Combustion is the mixing of two liquids without any reaction.

What is a flame?

• A flame is the visible part of a fire resulting from combustion.
• A flame is a type of gas used for cooking.
• A flame is a solid object that burns slowly.
• A flame is a liquid that ignites easily.

What are the products of combustion?

• Hydrogen and carbon monoxide.

• Methane and sulfur dioxide.

• Oxygen and nitrogen.

• Carbon dioxide and water vapor.

What factors affect the rate of combustion?

• Temperature, pressure, and the presence of catalysts.

• Color, shape, and size of the fuel.

• Humidity and the time of day.

• The age of the fuel and its packaging.

What is the role of oxygen in combustion?

• Oxygen is necessary for the combustion process to occur.

• Oxygen is a byproduct of combustion.

• Oxygen acts as a fuel source.

• Oxygen cools down the combustion reaction.

What is the significance of the ignition temperature in combustion?

• It is the temperature at which a fuel will spontaneously ignite.

• It is the temperature at which combustion stops.

• It is the temperature that determines the color of the flame.

• It is the temperature at which oxygen becomes a fuel.

How does the presence of moisture affect combustion?

• Moisture enhances the combustion process.

• Moisture increases the temperature of combustion.

• Moisture has no effect on combustion.

• Moisture can inhibit combustion by absorbing heat.

What is the difference between complete and incomplete combustion?

• Complete combustion occurs only in liquids, while incomplete combustion occurs in solids.

• Complete combustion requires more fuel than incomplete combustion.

• Complete combustion produces carbon dioxide and water, while incomplete combustion produces carbon monoxide and soot.

• Complete combustion is a slow process, while incomplete combustion is rapid.