Candle Experiments

In science, we did many experiments using candles. For the first experiment we massed a candle on a balance, and recorded it. We then lit the candle and every 20 seconds, recorded the mass. The candle dropped around .15 grams every 20 seconds. This just proves that a candle will evaporate over time. For the second experiment we tried to prove that the candle needs oxygen to continue burning. We placed a beaker over the candle and recorded how long it takes for the candle to run out of oxygen. The candle took 5 seconds to burn out. With the beaker covering the candle and not allowing any oxygen to flow into the beaker the candle ran out of oxygen to burn on.

For the third experiment we attempted to prove that carbon dioxide was a product of burning a candle. First we burned a candle to produce liquid wax. We then dumped the wax into a pan, and quickly placed the candle on top, this was used to hold the candle down.We then poured water into the pan around the candle. The candle was then lit, and we placed an Erlenmeyer flask over the candle. As the candle continued to burn the water moved up the Erlenmeyer flask. This happens because as the oxygen burns it heat up the inside of the flask. Heated particles move faster which created a higher pressure. The water was then used to to equal out that pressure. So as the water moved up the flask the candle burned out. We then quickly pulled of the flask, flipped it over, then poured bromothymol blue into it. The bromothymol blue reacts with carbon dioxide and turns a green color.

For the fourth experiment was to show how a candle burns. We took two candles and lit them, we then blew one out and tried to relight one with the other. Using heat from the still lit candle, the candle heated the particles of the unlit candle and relighted the candle. Next we had to balance an equation. I ended up with the equation 2C2OH42+61O2=> 40CO2+42H2O. This equation is balanced, because the molar mass on each side is congruent.
This Shows the Third Experiment
  

Volume,Mass,Density

In Advance Science we did a water displacement test to find volume. We dunked Sarah into a trash can full of water. We filled 1000ml graduated cylinders with the water that fell out of the trash can. We came up with 54,520ml of water that was displaced, which means her volume was 54,520ml. There are many errors in this experiment. Some of them such as human errors, water spilling form the cups, not exact measuring in the beakers were some of the bigger errors.

Precision- As close as you can get with the tool you are using.
Accuracy- How close you are to being right.

We also did a candy bar density experiment. Our job was to take three different candy bars of one type of candy and measure the mass and volume. To get the volume I measured Length,width, and height. We did this by using a ruler to measure each side, and trying to get the least air as possible. You label your data as Cm3. To find the mass you place it on a balance. You label this data as G.After figuring all of the mass and volume measurements, you find the density. Density is Mass/Volume. After doing this equation for each one you label it G/Cm3. We then take the three measurements add them together and divide by three. This gives you the average of the density. From here you have to decide weather the candy bar can float in water. Water has a density of 1gG/Cm3. Now there was several mistakes in this experiment. First off there was still air in the candy bar, which made it harder to measure, also we might of not been as exact.
This is an example why a candy bar would sink.

This example shows a candy bar floating because it has a higher density(Tennis Balls) than the water.
Here is another example of density

This shows density because the red liquid is less dense than the green, more more dense then the white. The white and purple liquids have a relatively close density so it it drooping.