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at home science chemistry pages home a and p astronomy biology chemistry earth science general nature physics our house about me showing posts with label chemistry show all posts showing posts with label chemistry show all posts sunday february 19 2012 crime busters crime busters is a skills oriented chemistry event in science olympiad students are given a scenario and evidence collected at the scene of the non violent crime they analyze the clues in order to solve the crime you can see a good description of the event at crime busters on scioly a student wiki for science olympiad for exchanging tips and resources note that gypsum is plaster of paris and calcium carbonate is chalk half the points are earned in the analysis portion in which students need to identify an unknown powdered solid a liquid and a metal these are pictures from the powdered solid analysis what you see are 11 of the 13 possibilities that i actually had around my house even acetic acid being a bread baker sand go figure and sodium acetate were the only two i did not have other things you need are lugol s iodine not alcohol based like the stuff at the pharmacy hydrochloric acid hcl and ph paper all available along with acetic acid from home training tools they include instructions to make a 3m hcl solution you may want to get a brown glass bottle to store it in as well and a 10 ml graduated cylinder to measure it out though not necessary the coolest reaction vitamin c acetic acid turns iodine from brown to completely clear posted by kris at 2 19 2012 2 comments labels chemistry experiments science olympiad wednesday september 28 2011 chemical proportions and electrolysis in preparing for middle school chemistry with our co op our family we are going through matter and energy principles of matter and thermodynamics this volume has two chapters about chemical reactions and the periodic table so it makes a good transition the first chapter is about the law of conservation of matter and while we just read the chapter i ve been inspired by something i found here i modified it for homeschoolers taking out much of the school jargon and requirements and posted it here i hope to try it and blog about it soon meanwhile the second chapter is how the elements combine proust first figured out that chemicals combine by mass in definite proportions dalton realized that some chemicals combine in several but definite proportions a fact that fit in well with his proposition of matter being made up of atoms next gay lussac showed that gases combined in the same proportions by volume leading to his law stating that equal volumes of gases have equal numbers of atoms avogadro figured out how many this was all well and good but i was not sure how much they got from this chapter i did not have the materials the book listed to carry out electrolysis i did an internet search and found that some people used pencils with both ends sharpened making holders from styrofoam trays or cardboard all powered with a 9v battery see here and here i wanted to capture the gas as was done in the book so we could test them so this is what i did i filled a measuring cup with water and added a teaspoon of salt i attached a piece of aluminum foil to one end of two wires with alligator clips i filled the test tubes with water and placed them over the foil pieces using the top of the test tube rack to hold them upright finally i connected the other end of the wires to each terminal of a 9v battery as you can see at the top of the test tubes gas began to collect my boys knew water was h2o and that meant 2 molecules of hydrogen and one of oxygen i explained that electrolysis was splitting water with electricity i posed the question how do you know which gas is collecting in which tube we went through the chapter again proust and dalton both worked with mass while our experiment was based on volume we discussed more about gay lussac s law and asked how definite proportions relate to the creation of water with h and o the wheels started turning and they then knew for certain that the tube with more gas had to be the hydrogen i do suggest a lantern battery for this though because the 9v ran out when only a fourth of the hydrogen tube was filled but i am actually a bit glad i pulled it out of the water let the water fall into the measuring cup lit a match and put it into the mouth of the tube the loud whistle and pop was impressive enough to prove that indeed it was hydrogen posted by kris at 9 28 2011 4 comments labels chemistry experiments secrets of the universe sunday september 11 2011 middle school chemistry our focus this year is chemistry a long while back i found a great free resource called middle school chemistry by the american chemical society this 600 page pdf takes an inquiry approach to chemistry meaning that students first make observations through hands on activities and then learn about the concepts behind them the book has 6 chapters and 38 lessons it starts off simply but builds quickly the needed specialty supplies like graduated cylinders and copper sulfate are few are not needed until later in the book everything else is around the house or at the pharmacy to go with this we are reading the wonder book of chemistry by jean henri fabre it is available at google books or the baldwin project online or through yesterday s classics in print form it covers a lot of what middle school chemistry does plus a whole lot more including a little plant biochemistry this is a wonderful living science book it s the story of uncle paul educating his two nephews emile and jules through demonstration and conversation i hope my boys are as inspired as the nephews are in the book and that they don t expect that we can carry out the same demonstrations finally after working through these i hope to work through tops analysis 10 it contains 16 task card activities i am supposed to give them one and have them work through the task at hand the book gives detailed explanations for teachers so they can get students started if they don t quite understand what is being asked but after going through the above materials i am hoping they will have fun exploring the materials in this one i will find supporting material on explorelearning gizmos adaptive curriculum and discovery streaming as well and blog when i can about our progress posted by kris at 9 11 2011 4 comments labels chemistry middle school chemistry book older posts home subscribe to posts atom my live online courses and more homeschool connections live online classes and unlimited recorded subscription service middle school kingdom animalia begins 1 12 2016 from my science library click on a cover for more information my library at librarything twitter feed tweets by athomescience share my button science resources acorn naturalist american educational products bargain microscopes blue spruce scientific carolina biological supply delta education edmunds scientific great scopes home 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specimen of the two the former is preferable anna botsford comstock handbook of nature study science can purify religion from error and superstition religion can purify science from idolatry and false absolutes pope john paul ii beautiful is what we see more beautiful is what we understand most beautiful is what we do not comprehend bl nicolas steno founder of modern geology go my sons burn your books and buy stout shoes climb the mountains search the valleys the deserts the sea shores and the deep recesses of the earth observe and experiment without ceasing for in this way and no other will you arrive at a knowledge of the true nature of things petrus severinus 16th century danish alchemist all this propaganda for literacy of one sort or another comes from people who believe that everyone should share their particular views of what the most important knowledge is and what conclusions should be drawn from it in other words they want others to be indoctrinated henry h bauer scientific literacy and the myth of the scientific method furthermore and contrary to popular belief the church never supported the idea that the earth is flat never banned human dissection never banned the zero and certainly never burnt anyone at the stake for scientific ideas james hannam the genesis of science snap shots theme images by sololos powered by blogger