Candle Experiment - First Lab PDF

Preview

Summary

First Lab...

Description

Experiment A. Reigniting a Candle

Observations   

B. Water Suck-Up

   

C. Extinguishing a Candle with Aluminum Foil

   

D. Candle Condensation

    

E. Extinguishing a Candle with Carbon Dioxide

  

Candle Experiment

Lit candle for 1.5 minutes Carefully blew out Put new match in smoke trail and it reignited

Results and Explanations

A candle works by melting the wax underneath, which turns into light and heat. The smoke trail is having some more wax residue that wasn’t burnt so when a flame comes by, it is reignited Melted bottom of candle With the water, the cup creates a seal, not letting anymore air to stick to middle of inside. The flame continues to bowl Filled up with room burn the left-over oxygen that is leftover. When that runs out, it temperature water Lit candle for 1.5 extinguishes. Air then cools, and decreases in volume that brings minutes Placed glass over and it the water up to rise extinguished Water rose into cup Lit candle for 1.5 The foil surrounding that wick is minutes preventing oxygen from travels Place aluminum around to the candle wax. The flame wick increases because oxygen is Flame grew a little in pushed upward to the flame size which then consumes the Flame extinguished oxygen and flame extinguishes Lit candle for 1.5 Warm air rises, but then cools minutes rapidly when it reaches the Put ice in aluminum foil bottom of the ice pack. The air Place ice aluminum foil underneath then condenses pack above flame quickly and forms the water Bottom of foil pack droplets starts to form condensate, gets all wet Lit candle for 1.5 Carbon dioxide is released as minutes product of mixing baking soda Combine baking soda and vinegar. When the cup is with vinegar in one cup tilted, all of that carbon dioxide When foamy, pour cup is moved towards the flame, into jar with candle, extinguishing it flame extinguishes

Candle Experiment Questions 1. Why did the candle reignite with a match held away from the wick? The smoke trail that is left behind after blowing out the candle still has some leftover wax that wasn’t burned up initially. So, when a new flame is added to the system, that same unburned wax is what caught on fire and still being “connected” to the wick, it all lit. 2. a. Explain how the candle extinguished with aluminum foil and carbon dioxide. In order for a candle to work, you need oxygen and that wax to burn. When the aluminum foil is placed in between the wick and flame, the oxygen is interrupted from being able to reach the candle to continue fueling the flame. As for the carbon dioxide, a flame needs oxygen to be able to burn, so when you replace all of the oxygen in the system with carbon dioxide, it has nothing left to burn so it extinguishes. b. Suggest and explain another method to extinguish a candle not already used in Part A of this experiment. You can simply cover the candle with a cup, and it will not let as much oxygen in as is necessary to keep burning. Putting it out. c. Write out the balanced chemical equation for the reaction that produced the carbon dioxide you used to extinguish the flame. CaCO3 (s) + 2HCL (aq)  CaCl2 (aq) + H20 (l) + CO2 (g) 3. What does the formation of water on the aluminum ice sack suggest about the chemistry of a burning candle? Candles are made up of hydrocarbons, meaning that is hydrogen and water that is within it. When heat is introduced to the system, you get carbon dioxide and water as products. So, when it travels upward, and comes in contact with a cold surface, it condenses and forms liquid. 4. a. Suggest a reason why the water is sucked up into the glass jar. The flame uses up all the available oxygen in the cup up until there is no more in the cup and extinguishes, leaving behind a void in space within the cup and then the water is sucked up as a result. Not only that though, the air inside is being heated while the candle is still lit, expanding the volume it takes up, so when it burns out, this air cools and takes up less space then before and has a lower pressure in the cup. b. A candle flame will use up oxygen as it burns. However, the consumption of oxygen alone does not explain the observed volume change. What other factor(s) need to be considered? The air inside is being heated while the candle is still lit, expanding the volume it takes up, so when it burns out, this air cools and takes up less space then before and has a lower pressure in the cup.

5. Explain the difference in the shapes of the two flames (Normal candle and the nearly identical candle in micro gravity flame) shown on page 51 of this manual. A flame is dealing with gravity on Earth so as a result, the classic teardrop shape forms. Additionally, hot air rises and with it, draws cool air behind it. When an environment has limited number of oxygens, the flame is forced to diminish in size and ball up like that, making them great in low gravity environments....