Otero- Experiment #3

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Broward College *

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1045L

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Chemistry

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Oct 30, 2023

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pdf

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1 Household chemistry Experiment 3 Data Sheet: 3 Name: Ariana Otero Qualitative Observations of a Chemical Reaction Write observations and data for each procedure step. Take at least three pictures of your choice of observation/steps 1–8 and add to data sheet (required). Step 1 After lighting the candle, I see the was wax begin to melt off and drip into the glass bowl. The two candles I put together create a bigger flame and obviously produces much more wax. The melted wax begins creating a large puddle of melted wax in no shape. It begins to harder quickly after being dropped into the glass bowl. Step 2 In this step, I lit up a match and held it one hand while I blew out the candles that were previously burning into the bowl. I then held the match really close to the blown-out candles and watched how it immediately lit up the candles. Now I was left looking at the lit-up candles and match. It was surprising how the match reignited the candles so quickly. Step 3 In this part of the experiment, I scrapped off all the wax that had fallen from the candle and put it into a smaller glass bowl. The wax had already hardened so it was a bit difficult trying to scrape it off the surface. I then lit up a wooden stick to try to light the hardened wax without burning myself. I watched as the once hardened wax became liquid once again. I thought that it was catch fire like a normal candle, but without the string to keep the flame, it just turned back to liquid wax. Step 4 In this experiment stage, a toothpick is used to produce a temporary wooden wick by inserting it into the soft candle. The toothpick produces a flame when it is ignited with an outside heat source. The surrounding candle wax is burned as a result of the flame spreading to the wooden wick made of the toothpick. The wax is consumed by the flame on the wooden wick, which burns slowly and displays a range of hues and intensities. Eventually, a residue is left behind. Step 5 On a ceramic plate, a lengthy string is laid, then lit. The string ignites and burns, maybe emitting smoke along with a discernible flame. Observations included the dark hues and intensity of the flame, the speed at which the string burns, the existence of smoke, and the amount of black ash or residue that the flamed thread left behind. Step 6 I began by carefully making a tiny slit in an inch of aluminum foil. I saw the candle's flickering flame dance with its alluring radiance as I lit it. I excitedly positioned the foil over the liquid in the wax basin, just below the flame. I was instantly captivated by the flame's behavior since it appeared to be interacting with the foil by becoming longer and arcing around the borders of the slit. The color of the flame varied a little, becoming more vivid in some places. Step 7 I covered the lit candle in this stage by setting a drinking glass upside down. I noticed little drops of condensation on the interior of the glass as the flame burnt. The droplets seemed to be transparent, but when I tested them on a sheet of colored paper, it left a clear mark, indicating that there was water vapor present in the accumulated moisture. Step 8 I covered the candle flame with an upside-down glass bottle for a while during this phase. I poured lime water solution, turned it right side up, sealed the bottle, and gave it a good shake. The limewater subsequently underwent a noticeable shift. The buildup of carbon dioxide (CO2) following burning caused the originally clear limewater to turn milky or hazy. It was an obvious illustration of how lighting the candle generated carbon dioxide, which was then combined with the limewater to produce calcium carbonate, changing the solution in a way that was easy to see.

2 Images: Step 1: Step 2: Step 3: Additional questions: 1) What phases (solid, liquid, gas) are present in the unlighted candle? The wax of an unlit candle is primarily solid, with a little quantity of liquid around the wick because of the temperature. Over the liquid and all through the solid wax are vapors and gases. 2) What phases are present in the lighted phase? Wax is converted from a solid to a gas during combustion through a complicated web of chemical reactions which take place in the wax's liquid phase. The combustion process is sustained by the flame, which also hosts the reactions and phase shifts that are most intense. 3) Why does the candle relight in step number 2 ? Reignition is made possible by the presence of flammable residues, fumes, and a higher temperature close to the wick. The wick receives the appropriate amount of activation energy to start a fresh combustion reaction, which ignites the candle when it is exposed to an external heat source like a lighted match or lighter. 4) When burning a hydrocarbon (candle wax C25H52) what two products are given off? The two main byproducts of burning a hydrocarbon, such as candle wax, are carbon dioxide and water vapor. Candle wax is often made up of atoms like C25H52, a long-chain hydrocarbon. 5) What substance is indicated by the cobalt chloride test/Brown paper? What change takes place for a positive test? The brown paper test identifies the presence of oil or oily substances by alterations to the transparency of the brown paper, whereas the cobalt chloride test identifies the amount of water by a color change within the cobalt chloride paper.

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