From Gas To Rust

Attach a vertical strip of masking tape to the side of each of your test tubes for marking the water level)and using the permanent marker, make a mark on the tape about 1 CM down from the mom the of the test tube. This will be the outside water level. 4. Tear off enough steel wool to make a ball about 2. 5 CM in diameter. Use a p encircle to push the steel wool down to the bottom of a test tube. Repeat for a total of three test tubes with steel wool. 5. Rinse all of the test tubes (three with steel wool and three without) by filling the test tubes with water, allowing the water to sit there for 1 minute, and then pouring the water out.This step will dampen the tell wool in the three tubes that have it thus making sure there is enough water present for the oxidation reaction. Treating the the ere test tubes without steel wool the same way ensures that all variables are controlled. 6. Turn all six of the test tubes (three with steel wool and three without) upside e down and mount them over the jars so that the water level is at the starting mark you made in step 3 on each test tube. 7. You may want to cover your entire setup with a big plastic bag to minimize evaporation. Be careful not to knock the test tubes when covering and uncovering. Check at least daily, and write your observations down in your lab notebook k. Carefully mark the water level on the tape on each test tube. 9. When the water level is no longer changing in the test tubes, you're ready t o analyze your results. 10. Measure the difference in water level between the open end of the test TU be and the water height inside the test tube at the end of the experiment. For how many tubes did the water level change? For t hose that did: Calculate the volume that corresponds 2 to this difference the total starting volume of air in each test tube.Volume of a cylinder: V=nor h Remember, for tubes containing steel wool, the wool will displace most of the air. Make sure your measure ants and calculations tak e this into account. 1 1 . Calculate the proportion of oxygen in each test tube. Average the proportion on of oxygen from all the test tubes with steel wool. How does this compare with the value for percentage of oxygen in the air that you found in your background research? Background Information The goal of this experiment is to measure the percentage of oxygen in air Sam peels and this reject will show an interesting way of doing that.The method depends on at mesospheric pressure and a chemical reaction that removes oxygen from the air. I will find out what kind 0 f chemical reaction can remove oxygen from the air. Oxidation of iron, also known as rusting, will do t he trick. Exposed iron will rust in the presence of oxygen and water. I will study this chemical reaction a ND I'll see that oxygen becomes combined with the iron atoms and water to create iron oxides. I thin k this meets middle school grade level expectations because it enables me to understand the term s and concepts : atmospheric pressure, oxidation of iron and the layers of the atmosphere.The question I am asking is why does the water level eventually stop rising? I wanted to know how much oxygen is in the air and how much of it we consume when we bread the every day. Well this project shows an interesting way of finding out. The atmosphere contains the oxygen we need to breathe to support cellular respiration, the metabolic process that provides the e chemical energy necessary for life. This makes my project possible and yet at the same time ca vitiating. I'm going to SE test tubes to measure the percentage of oxygen in my air sample.This is what gave me the idea to do this science experiment. Variables The independent variable was the varying types of metal: steel, copper, and iron. The dependent variable was the amount on rust on each sample. The control fifths experiment is the surrounding air. The constants in this experiment are the type of test tubes used, the time each metal spent subm erged in water, the water in each bottle/jar, and the temperature of the surrounding air. Graph Data Table Types of Metal Trial 1 Trial 2 Trial 3 Average Copper ml ml mm 21. Ml ml gorgon ml 28. Ml Steel Wool ml mm mm L 34. Ml Hypothesis If the metal rusts, then the level of the water in the measuring beaker will decrease. Conclusion My hypothesis was if the metal rusts, then the amount of water in the measuring beaker will decrease and it was correct. My data supported my hypothesis because as the metals developed rust, the amount of water in the measuring beakers decreased. The average for the copper was 21. 3. The average for the iron was 28. 7 and the average for the steel wool was 33. 7. The copped water level decreased the most and the steel wool decreased the least.My question, why does the water eventually stop rising was answered. I found out that the water level decreased because of evaporation. Reflection loved working on the project but what I enjoyed the most about it wa s making g the test tubes. My data made sense because its shows the water level decreasing for each metal like I said it would in my hypothesis. Now that I have finished my experiment have new questions such h as what would happen if collected air samples at high altitude, and then tested them at low altitude or vice versa).If I ever took a vacation in the mountains, I can use this method to compare oxygen el veils in the air at high and low altitude. I could try doing this experiment at high altitude and comparing t he results with same experiment done at a lower altitude. Can use this procedure to detect decree seed oxygen content in exhaled air. Then I could do background information and find out how much oxygen we consume when we breathe. I think this method is sensitive enough to detect the difference an d would provide me with more accurate data.

Judaism and Passover

* This essay will describe Passover a Jewish Holy Days. This essay will discuss the time of the year of the holy day(s), the historic origin of the holy day(s), and the religious practices associated with the day(s). This essay will also identify the theological or cultural differences that may lead to differences in the observance of the holy day by the various branches of Judaism. * Passover is a Jewish holidays, best known maybe because Christian history, the Last Supper was said to be a Passover meal. The last and greatest of the plagues is the death of the first-born sons of the Egyptians.The Israelite’s son weren’t killed because they have followed Yahweh’s warning and have marked the doors of their homes with the blood of a substitute – a sacrificial lamb (Exod. 12:13). Because God has â€Å"passed over† Egypt, the event is thereafter called the Passover or Pesach, and its yearly memorial has become one of the major Jewish festivals. Passover begins on the 15th day of Nissan (Nissan is 30 days between March-April). Passover is the first of the three major holidays (Passover, Shavu’ot and Sukkot) with both historical and agricultural significance.Historically Passover observes the Exodus from Egypt after many years as slave to the Egyptians, as told in Exodus. Agricultural receives little attention, it is the beginning of the harvest season in Israel. The weeklong holiday of Passover starts on the first lunar month and may have originally begun as a renewal springtime nature day. It recalls the Hebrew’s escape from Egypt slavery. Placing lamb blood from the Passover meal, as told in Book of Exodus, over the doors of the Hebrews, keeps the angel of death from killing their first born sons and the power of God â€Å"passed over† Egypt.The Passover Meal is a memorial meal, the Seder or order, at which Jews eat several symbolic foods (bread, a meal, salad of nuts and fruits). The bread, a thin flat bread called matzah, does not have yeast. Matzah shows how there was no time for bread to rise in the Hebrews’ rush to leave Egypt. This is also refer to as chametz (leaven; sounds like â€Å"hum it's† with that Scottish â€Å"ch†), it symbolizes a way of removing the â€Å"puffiness, arrogance, pride† from their souls. Chametz includes anything made from the five major grains (wheat, rye, barley, oats, and spelt) that have not been completely cooked within 18 minutes after coming into contact with water† (Judaism 101). A shank bone of lamb or other animal is in the meal, symbolizing the sacrificial lamb. A salad of nuts and fruits, or haroseth, symbolizes the mortar used by the Hebrews in their forced labor. To remember the suffering of the Hebrews during their oppression, diners dip parsley in saltwater and eat bitter herbs. During the meal the story of Moses, and the Israelites is retold.A place and cup of wine is set up at the table for the prophet E lijah, â€Å"actions representing the hope that he will return to earth to announce the coming of the Messiah. A delicious meal follows the ritual part of the supper. Today many Jews invite non-Jews to share in their Seder and celebration of Jewish customs† (Molloy (2010)). The text of the Passover seder is written in a book called the Haggadah. â€Å"Orthodox Jews of Ashkenazic background also avoid rice, corn, peanuts, and legumes (beans) as if they were chametz.All of these items are commonly used to make bread, thus use of them was prohibited to avoid any confusion. Such additional items are referred to as kitniyot† (Judaism 101). * In conclusion this essay described Passover. The essay discussed the time of the year of the holy day(s), the historic origin of the holy day(s), and the religious practices associated with the day(s). This essay also identified the theological or cultural differences that may lead to differences in the observance of the holy day by the various branches of Judaism.