Double Placement Reactions Lab Essay Example

Double Placement Reactions Lab Essay Reactions Lab * November 14, 2010 Double Replacement Reaction Introduction / Purpose: The purpose of this experiment is to combine a solution made of potassium iodide and a solution of lead (II) nitrate and produce a precipitate. The reaction is listed as Pb(NO3)2(aq)+2KI(aq) 2KNO3(aq)+PbI2(s). The contents of the beaker was the solution of potassium iodide and lead (II) nitrate. The solution was poured into an Erlenmeyer flask holding a Buchner funnel with a piece of filter paper at the bottom of the funnel. The filter paper contained a yellow precipitate at the end of the experiment. This precipitate was lead (II) iodide. The potassium combined with the nitrate and filtered through the paper whereas the lead combined with the iodide and was not soluable in water and was collected on top of the paper. Materials: * 40 ml Potassium Iodide (Kl) * 20 ml Lead (II) Nitrate (Pb(NO3)2) * 100 ml Beaker * Stirring rod * Erlenmeyer flask * Buchner funnel * Watch glass * Scale Experimental Methods: 1) Obtain a 100 ml beaker 2) Obtain 40 ml of Potassium Iodide (Kl) 3) Obtain 20 ml of Lead (II) Nitrate (Pb(NO3)2) 4) Obtain an Erlenmeyer flask 5) Obtain a Buchner funnel with filter paper at the end of the funnel 6) Obtain a stirring rod ) Obtain a watch glass 8) Combine the 40 ml of Potassium Iodide (Kl) and 20 ml of Lead (II) Nitrate (Pb(NO3)2) in the 100 ml beaker 9) Use the stirring rod to stir the solution 10) Place the Buchner funnel in the Erlenmeyer flask 11) Pour the solution from the 100 ml beaker into the Buchner funnel 12) Remove the Buchner funnel from the Erlenmeyer flask 13) Place the solid precipitate from the filter paper into the watch glass 14) Using the scale, record the weight of the solid Data: Weight of Percipitate| Color of Percipitate| % Yeild| 9. 112 g| Yellow| . 0098828633| We will write a custom essay sample on Double Placement Reactions Lab specifically for you for only $16.38 $13.9/page Order now We will write a custom essay sample on Double Placement Reactions Lab specifically for you FOR ONLY $16.38 $13.9/page Hire Writer We will write a custom essay sample on Double Placement Reactions Lab specifically for you FOR ONLY $16.38 $13.9/page Hire Writer Results: When Potassium Iodide is combined with Lead (II) Nitrate, a chemical reaction occurs. The lead combines with the idodine and the potassium combines with the nitrate. One solution remains a liquid whereas the other solution becomes a solid. The solid is not soluable in water and is able to be filtered out. The equation is pictured below in Figure 1. The solid turned yellow in color. After the solid was filtered from the solution, it was weighed. This weight was measured and calculated as the percent yield. Figure [ 1 ] Discussion and Analysis: This experiment was a basic one with little possibility for error. The combining of two liquids produced a liquid and a solid. The positively charged atoms present in one solution combined with the positively charged atoms present in the other. This left the negatively charged atoms in both solutions to do the same. This is known as a Double Reaction. In this experiment, the Potassium Iodide was mixed with Lead (II) Nitrate. When the two chemical compounds were combined in a beaker and stirred with a stirring rod, the solution changed color. The solution in the beaker turned yellow in color. After stirring the solution, it was poured into a Buchner funnel that had a piece of filter paper at the bottom. This filter paper aided in collecting the precipitate and allowing the remaining liquid solution to pass through. The precipitate that was collected was transferred to a watch glass. After weighing the watch glass, the weight of the solid was calculated. The weight of the solid subtracted from the original weight of the solution gives the weight of the remaining liquid that was filtered through the filter paper. The weight of the solid is used to calculate the percent yield. The formula used to calculate the percent yield is: = (actual yield/predicted yield) x 100% = (actual yield /((20 ml /1000ml / liter) x GMW of PbI2)) x 100% = (actual yield / (. 2 x 461. 009)) x 100% = (actual yield /9. 22) x 100% = . 0098828633 Conclusions: The experiment went just as planned. The hypothesis was that a precipitate would be yielded as the result of combining two solutions together and passing the solution through filter paper. The solutions combined and reacted just as predicted. The cations and anions combined together and created a precipitate that was yellow in color. The precipitate was weighed and gave a chance to calculate a percent yield. The data collected was plugged into a formula that was given in the experiment procedures. The weight of the solid precipitate was divided by the predicted yield and then multiplied by 100%. In conclusion, the experiment was a success. Observations Record weight of lead (II) iodide solid (grams): 9. 112 g Calculate % yield = (actual yield / predicted yield) x 100% = (actual yield / ((20 ml /1000 ml/liter) x GMW of PbI2)) x 100 % = (actual yield /(. 02 x 461. 009)) x 100 % = (actual yield / 9. 22) x 100% = 0. 0098828633 g

Ideas for Celebrating Student Birthdays in School

Ideas for Celebrating Student Birthdays in School Teachers celebrate many special days in their classrooms throughout the school year, but birthdays are a special celebration and teachers should make it special for each student. Here are a few ideas for celebrating student birthdays  in the classroom. Birthday Placemats, Balloons, and Covers Make your students day even more special by placing a birthday placemat on their desk. When students enter the classroom everyone will know whos birthday it is by looking at the desks. For an added touch you can attach a brightly colored balloon to the back of the students seat, and cover their chair with a birthday chair cover. All About Me Poster When you know its one of your students birthdays coming up have that child create a special all about me poster. Then, on the day of their birthday, have them share their poster with the class. Birthday Questions Each time it is someones birthday in the class each student gets to ask the birthday student a question from the flower pot. For directions on how to make the flower pot and a downloadable question bank visit Fun For First. Birthday Graph Celebrate birthdays in your classroom by having students create a birthday graph! During the first week of school as a class create a birthday graph that will pose as the birthday bulletin board. Above each month, put the students birthday. Birthday Bags Every child loves getting presents on the birthday! So here is an idea that will not break the bank. At the beginning of the school year go to the nearest Dollar Store and purchase the following items: Cellophane bags, pencils, erasers, candy, and a few trinkets. Then make a birthday bag for each student. This way when their birthday comes around, you will already be prepared. You can even print out cute labels that say Happy Birthday with their name in it. The Birthday Box To create a birthday box all you have to do is cover a shoe box with birthday wrapping paper and place a bow on the top of it. In this box place a birthday certificate, pencil, eraser, and/or any small trinket. When students enter the classroom have each person make the birthday girl or boy a birthday card (this goes in the box too). Then at the end of the day when its time to celebrate give the student their birthday box. Birthday Wish Book Celebrate each students birthday by having the class create a birthday wish book. In this book have each student fill out the following information: Happy Birthday, _____My birthday wish for you on your birthday is _______If I could give you a gift I would give you _______The thing I like the best about you is ______Have a great day! From _______ Once students have filled out their page for the book have them draw a picture. Then assemble all of the pages into a book for the birthday student to take home. Mystery Gift A fun gift to give to students on their birthday is a mystery bag. Purchase one or more items (the dollar store has great cheap gifts for kids) and wrap the items up in different colored tissue paper. Choose dark colors so the student cannot see what is inside. Then place the gifts into a basket and allow the student to choose whichever gift they want.

Creative Process Essay Entry Example | Topics and Well Written Essays - 750 words

Creative Process Entry - Essay Example several common ideas such as the fact that creativity entails innovative and novel contemplations of the world, I do not think it is a teachable skill. A person is born with a certain amount of creativity, and while these can be developed through experience and education, if one is not naturally creative, your creativity can only improve to a limited extent through education. According to Franken, creativity entails a tendency to generate or recognizes ideas alternatives and possibilities, which can be applied in problem solving or communication with others (396). I found this definition to be in line with my own since I believe creativity is best understood when observed in a functional perspective in view of how it can solve problems or help one deal with issues. In my life, I believe creativity often surfaces when I am face with unusual situations that call for me to be innovative and think outside the box, sometimes, it emerges when I am under pressure to do something, and not all the conventional methods produce the desired result. I remember an incident when I was in high school, and my creative writing teacher told us to construct a sentence using the word flummox. We had no idea what the word mean, and we were given 30 seconds in which to do it. After realizing that none of my word attack skills was going to get me an answer, I wrote, the sentence â€Å"Flummox is not a very common word in most high school students vocabulary†. The teacher said that was not the way to construct sentences, but she gave me a mark because I had used my imagination where less none of my classmates had. My creative process is dictated by circumstances and managing it is more often than not a subconscious activity. For instance, there are times I am b ursting with new ideas when I cannot apply them, sometimes I come up with what I feel are incredible storylines for creative writing essays, and shorts stories when am in the bus or shower but forget them almost