Fill beaker with water Use the disposable pipette to place water in the graduated cylinder until the unidentified object would be completely submerged in water Record what the measurement of water in milliliters before placing the unidentified object into the graduated cylinder Gently place the unidentified object into the graduated cylinder Record the measurement of the water in milliliters after placing the unidentified object into the graduated cylinder Subtract the measurement of water in milliliters before placing the unidentified object into the graduated cylinder from the measurement of the water in milliliters after placing the unidentified object into the graduated cylinder, this is the volume of the unidentified object Record the volume (the answer you got in step 10) of the unidentified object in the data table Weigh the unidentified object on the scale, this is the mass of the unidentified object Record that number in the data table Calculate the density of the object by dividing the mass by the volume and rounding it to the proper significant figure, Record the density of the unidentified object in the data table Repeat the lab 2 more times and with each experiment record the data in the chart under the correct trial number corresponding with the correct
In the lab “All That Glitters” the objective that was focused on during the lab was calculating the density, volume and mass of various substances. The method that was used in finding the volume of the samples is called the displacement method. This is a process where the volume of the water in the graduated cylinder is calculated before and after the sample is placed. In this lab, the goal of the experiment was to identify and come to consensus about what the unknown substance might be. For this experiment, the required materials were ten pre and post pennies, unknown sample, graduated cylinder, weigh boat, water, paper towels and a weighing scale.
The lab started off by measuring critical materials for the lab: the mass of an an empty 100 mL beaker, mass of beaker and copper chloride together(52.30 g), and the mass of three iron nails(2.73 g). The goal of this experiment is to determine the number of moles of copper and iron that would be produced in the reaction of iron and copper(II) chloride, the ratio of moles of iron to moles of copper, and the percent yield of copper produced. 2.00 grams of copper(II) chloride was added in the beaker to mix with 15 mL of distilled water. Then, three dry nails are placed in the copper(II) chloride solution for approximately 25 minutes. The three nails have to be scraped clean by sandpaper to make the surface of the nail shiny; if the nails are not clean, then some unknown substances might accidentally mix into the reaction and cause variations of the result.
At the beginning, the wax of the candle felt firm, and it was 8.1 cm and 9.078 g.
After we put the substance on the burner, we weighed it. Each time after we put it on the burner came with the exact same number: 21.16 grams. After we found the mass of the crucible, cover, and hydrated sample, and the mass of the crucible, cover, and dehydrated sample, we subtracted the two values to get the mass of water evolved: 0.24 grams. Then, we subtracted that value to the mass of the hydrated sample to get the mass of the dehydrated sample: 0.76 grams.
It took a little while, but soon the water started rising into the glass cover. 7. The data is recorded in a data table, and this experiment was replicated 3 other times. 8. The other candles were also later after the one candle was lit.
Therefore, the more Oxygen in the air, the longer the candle will burn. Under a beaker with inhaled air, the candle burned 2.3 seconds longer than under a beaker with exhaled air. This proves that there is more Oxygen in inhaled air than exhaled air. Also, there is more Carbon dioxide in exhaled air than in inhaled air. That can be proven by a lab performed.
The items that were massed were the evaporating dish, watch glass, and NaCO3. The materials were massed once before and once after being heated in the drying oven. The mass of the evaporating Dish before was 46.57 g; while after being heating was 60.15 g. The mass of the watch glass before was 57.97 g and after was 48.75g. There were two masses taken for the substance NaHCO3- one with the evaporating dish and one without, subtracted out after the lab was concluded. The mass of the substance with the dish was 48.79 g before and 62.33 g after; meanwhile, the mass of the substance without the dish was 2.22 g before and 2.18 g after. The mass of the NaHCO3 had changed after the reaction occurred along with after it was placed on the hot plate and being in the drying oven.
Based on several pieces of data it is now understood that when you remove pressure, volume rises. The data that supports this claim is the Candle in a Jar experiment. In this experiment, you pour water into a plate, light a candle, place it in the middle of the plate, then cover it up with a cup. The flame uses up the oxygen in the cup and it creates low air pressure. The pressure outside tries to push in.
As the candle heats up the air, the temperature increases. Therefore the volume decreases creating a vacuum that “sucks” up the water. Since twice as much oxygen is burned than the carbon dioxide is being released, the air volume decreases as a result, allowing a liquid to flow in until the air volume lost is replaced. When the candle is thicker or the candle burns for a longer period of time changes, said variables cause a difference in the level of the liquid rising and how much the liquid rises. If the candle burns for longer, the air around the candle will be hotter, therefore the volume of the air will decrease.
However, we can say that it is the same wax as before. Even though sensory properties of the piece of wax changed, an object is still an object after undergoing external change. We see this change in nature as well, like a caterpillar
Descartes: But if we were to light the candle the wax would be very different. Leibniz: Yes, it would. It would be soft – melted even -, transparent and liquid more fragrant.
Just like everything else in this universe, there’s a chemical explanation behind candles. First, let’s discover what candles are made up of. They consist of the fuel which is the wax, and the wick. In the US for example, companies use stearic acid, beeswax and a large amount of paraffin to make the wax of candles. Paraffin comes from crude oil, it’s a dense hydrocarbon.
As well, this study is also important because it could affect the manufacturing of the candles, in terms of amount of materials and dyes that should be added to the candles, especially from safety and environment perspectives. Evaluation: Limitation How This Limitation Affected Your Results Realistic Improvements The height of the candle used in the experiment was relatively small, which made the measuring process challenging.
When the candle was lit, the vapours would be deadly. None of the poisons lost their potency especially in airtight chambers of the tomb where they can’t even
