Lab+5+Thermal+Combustion

**a)** Alcohol
//There are different types of alcohol. To see all there vaporization point Click Here//

**b)** Candle Wax
//The critical temperature for candle is//

//between 896 degrees F - 1130 degrees F. For more info Click Here//

//846 degrees F. Others vaporization temperatures can be found Here// //The cup is formed by a current of hot are that heat the wax but at the same times cools the wax outside of the heat range. This is what allows the wax to look like a cup. It can also be explained by the process of c////onvection, which heats are particles around it.//
 * 1. Questions:**
 * Why do candles a cup?**

**What is melting the wax inside the cup?**
//By a flame that runs down the wick and extinguishes before it reaches the bottom.//

**What happens to the wick as the candle burns?**
T//he wick, drawing liquid wax up into the flame, where it vapourises.// //It is essential that it bends to one side, as shown in my photograph. Where the end of the wick reaches the higher temperature and oxygen-rich air at the edge of the flame, it becomes incandescent and quickly burns away.// //This is how the wick maintains its constant, correct length.//

//At the very top because heat rises.//

**What color is the flame where it gets the most oxygen?**
//Blue//

**What is the yellow part of the flame?**
//The hottest part of the flame//

**What does incandescent mean?**
//The brightest part of the flame.//

**1.** How does water put out fires?
//Water takes up the carbon dioxide in the combustion.//

2. How does CO2 extinguishers put out fires?
//They cool the fire and remove the oxygen form the area.//

**3.** Why are people instructed to aim extinguishers at the base of the fire?
//The base of the fire is the most rich in oxygen.//

**4.** Given what you know about oxygen and combustion, why do you think opening a door in a burning building causes an explosion of the fire outwards (also known as a back draft)?
//The fire is looking for oxygen and when someone opens a door, the fire seeks the oxygen explosively.//

====**5.** There are two rooms, one filled with particles of dirt suspended in the air, the other has particles of flour suspended in the air. A match is lit and the room filled with suspended flour particles explodes, but the room with dirt doesn't. Why not?==== //Flour contains carbon and hydrogen chains which are substances that a// //re very fathomable.//

//Because each individual particle is flammable on its own plus it is suspended by air which contains oxygen. When a pound of flour is set on the floor. They tightly packed flour does not allow oxygen particles to flow through.//

**7.** Why does the alcohol for flambee desserts need to be heated or the alcohol won't burn?
//The vaporization heat needs to be reached in order to burn//

//of the taste of alcohol in the dessert. For more info Click Here//


 * Materials**

**3.** Describe what happened in scientific terms using what you have learned about the burning of candles and combustion.
// As the oxygen rises through the air, when one lights the match the gas stream will catch on fire (because the gas form of all organic matter is what burns) again and run down the wick once again. //

**4.** Describe what happened in scientific terms using what you have learned about the burning of candles and combustion.
//The emission carbon dioxide from the combustion of the candle combined with oxygen and hydrogen from the ice formed to create preparation on the foil.//

**5.** Describe what happened in scientific terms using what you have learned about the burning of candles and combustion.
//Just like when you put a lid on a hot pan. The perspiration of carbon dioxide, and hydrogen form a mist, in other words water.//

**6.** Describe what happened in scientific terms using what you have learned about the burning of candles and combustion.
//Carbon dioxide sucks the oxygen from the flame, thus extinguishing it.//

**7.** Describe what happened in scientific terms using what you have learned about the burning of candles and combustion.
// Oxygen is need and order for a combustion to happen. When a candle burning is shut of from its fuel (oxygen), is will extinguish. //

**8.** Describe what happened in scientific terms using what you have learned about the burning of candles and combustion.
//The gas in water in expanded which is carbon dioxide, and with the water it created bubble. The water sucked the oxygen out of the air and the glass stopped any oxygen or fuel form coming. The bubbles is an after math of the combination of water and carbon dioxide when it has no where to go.//