Heat the crucible using a high flame for about 5 minutes to drive out any impurities they may be in the crucible. Allow to cool for 10 minutes. Using the tongs, place the crucible and cover onto a fiber pad and record the mass of the crucible and cover with the scale. Record your data. Clean a 25cm long ribbon of magnesium with a ball of steel wool. Coil up the ribbon of magnesium so that it will easily fit into the crucible. Record the mass of the crucible, cover, and magnesium. Place the crucible with the substance in it on top of the triangle pipe stem. Place the cover ajar to allow the flow of oxygen inside the crucible.
Heat it gently for 2 minutes, then under high heat, heat it up for another 10 minutes. Allow to cool for 10 minutes. Place the crucible, cover, and contents onto a fiber pad. Record the mass. Repeat 11-16. If the difference between mass measurements in less than 0. 01g. record the mass as the constant mass. If the mass is greater than 0. 01g, repeat steps 11-16 until the measurements differ by 0. 01g or less. Record this in your data table as the constant mass. Put the remains of the substance into a hazardous waste container. Calculations: Mass of MG reacted| 0. 43g. | Moles of MG reacted| 0. 017g/mol|
Mass of product| 0. 67g. | Mass of oxygen reacted| 0. 24g. | Moles of oxygen reacted| 0. 015mol. | Experimental molar ratio: MG to O| 3:2| Accepted molar ratio: MG to O | 1:1| Percentage error| 1. 033| Post- Lab Questions: 1. What three types of information are used to find an empirical formula from percentage composition data? Answer in complete sentences. You must know the percent composition of each individual element, the molar mass of each element, and you must know the smallest number of moles of a given group of elements. 2. What is the relationship between the empirical and molecular formula of a compound?
The Essay on The Crucible Was The Mass Hysteria Necessary
In The Crucible, there was a lot of senseless behavior. The purpose of The Crucible is to educate the reader on the insanity that can form in a group of people who think they are judging fairly upon a group of people. Judge Hawthorne believes what he is told by certain people is the truth even if little evidence is to be shown. The young girls with Abigail convince Hawthorne of others being ...
Answer in complete sentences. They both can show the composition of each element in a compound. 3. Calculate the empirical formula for this salt: 56. 58% K, 8. 68% C, and 34. 73% O. K 1/39*56. 58=1. 45/. 72=2 Empirical Formula= K2CO3 C 1/12*8. 68=. 72/. 72=1 O 1/16*34. 73=2. 17/. 72=3 4. What is the simplest formula of a substance of 27. 3g of C and 72. 7g of O? C 1/12*27. 3=2. 275/2. 275=1 Empirical Formula= CO2 O 1/16*72. 7=4. 543/2. 275=2 5. When you heated the magnesium in this experiment, the mass went up. Did this surprise you? Where did the mass come from?
Answer in complete sentences. Yes, this did surprise me. I expected it to lose mass instead of gaining it considering when you burn something, it becomes smaller. The extra mass came from the oxygen in the air. It bonded with the magnesium atoms. Analysis and Conclusion: The purpose of this experiment was to determine the empirical formula of an oxide of ribbon. There was a set of three heatings. One to drive out impurities, one to heat the substance, and another to heat the substance again to see and differing results. We measured and recorded the masses after each heating.
The goal of this lab was to observe how oxygen can bond with magnesium using extreme heat. The mass of the crucible, cover, and contents was 23. 22g. After the first heating, it became 23. 46g. After the second heating, it was the same as the first heating. Our percent error was 1. 033. There weren’t too many margins of error that I observed that occurred during this lab. The only mistakes I saw were that one of my group members touched the crucible with their hands, possibly adding to the mass of the crucible. Also, there may have been a slight error in time, however only by less than a minute.
The Term Paper on Heat Pump
Outdoor components of a residential air-source heat pump A heat pump is a machine or device that transfers thermal energy from one location, called the “source,” which is at a lower temperature, to another location called the “sink” or “heat sink”, which is at a higher temperature. Thus, heat pumps moves thermal energy opposite to the direction that it normally ...
