The objective of this lab was to measure the amount of protein from a piece of beef liver . This was done by taking the liver‚ blending it and then using a centrifuge to separate the supernatant from the pellet. Once that was completed‚ ammonium sulfate was added to the supernatant‚ chilled and then spun for a second time. Next‚ 20 mL of water is added to the pellet‚ stirred and the volume was recorded. The teacher calculated the total mass of liver to be 10.098g. Lastly a spectronic 20 at a wavelength
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Discussion: From Filling out the table on page 104 of the lab manual I could already narrow by unknown hydrate down to only two options. My unknown compound I was given was green so I knew it had to be either copper (ll) chloride dehydrate or nickel (ll) chloride hexahydrate. After completing the dehydration part of the experiment I found my substance to have a water loss of 45.369%. The value I calculated for the percent water loss of my unknown compound was
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covering of another metal surface with another metal)‚ and the manufacturing of many kinds of chemicals such as chlorine‚ sodium chloride‚ and bleach. Also‚ electrolysis is used to extract reactive metals such as aluminium and the purification of copper. With these examples‚ we can say that electrolysis has many benefits‚ for example the manufacturing of bleach. Bleach can be used to clean household equipments‚ and to whiten/lighten or clean stains on white cloth. Other than that‚ there
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notes and calculation methods. Advanced Level Energetics–Thermochemistry – Enthalpies of Reaction‚ Formation & Combustion Sub-index for ENERGY CHANGES (GCSE/IGCSE/O level) 1. Heat changes in chemical/physical changes - exothermic and endothermic 2. Reversible reactions and energy changes 3. Activation energy and reaction profiles 4. Catalysts and activation energy 5. Introduction to bond energy/enthalpy calculations 6. Calorimeter methods of determining energy changes 7. Energy
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w w ap eP m e tr .X w om .c s er UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education 0620/12 CHEMISTRY Paper 1 Multiple Choice May/June 2010 45 Minutes Additional Materials: *8778752636* Multiple Choice Answer Sheet Soft clean eraser Soft pencil (type B or HB is recommended) READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples‚ paper clips‚ highlighters‚ glue or correction
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Reactions: Combustion: Lab Worksheet and Rubric Before You Begin: You may either copy and paste this document into a word processing program of your choice or print this page. Procedure: 1. Iron (IIII) and copper (II) sulfate solution Fill a small test tube halfway with copper (II) sulfate solution. Add a 2.0 gram iron rod to the solution and observe the reaction. 2. Lead (II) nitrate and potassium iodide solutions Pour about 2.0 mL of lead (II) nitrate into the test tube. Add 5 to 10 drops
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dichloride 75763-82-5 Ag2CrO4 silver chromate 7784-01-2 Ag2Cr2O7 silver dichromate Ag2F silver subfluoride 1302-01-8 Ag2MoO4 silver molybdate 13765-74-7 Ag2O silver(I) oxide 20667-12-3 Ag2S silver sulfide 21548-73-2 Ag2SO4 silver sulfate 10294-26-5 Ag2SeO3 silver selenite 7784-05-6 Ag2SeO4 silver selenate 7784-07-8 Ag2Te silver(I) telluride 12002-99-2 Ag3Br2 silver dibromide 11078-32-3 Ag3Br3 silver tribromide 11078-33-4 Ag3Cl3 silver(III) trichloride 12444-96-1
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configuration of Cu+‚ Cu2+ and Cr3+ are respectively 3d10 4s°‚ 3d9 4s° and 3d3 4s°. m o .c y a d with the help of above. The following questions can be answered o t (i) Scandium (Z = 21) is a transition s element but zinc (Z = 30) is not. e i (ii) Copper (Z = 29) and silver (Z = 47) both have fully filled d-orbitals dthese u i.e.‚ (n - 1) d . why are elements are regarded as transition t s elements? . w (iii) Which of the d-block elements are not regarded as transition w elements? w 10 UNDERSTANDING
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Procedure: 1. Iron (IIII) and copper (II) sulfate solution. Fill a small test tube halfway with copper (II) sulfate solution. Add a 2.0 gram iron rod to the solution and observe the reaction. Observations: When I put the Iron (lll) and cooper (ll) in the test tube I notice that the color change to a darker gray at the beginning. Regarding to the sulfate solution I also notice that its color change in to a clear blue. When they are mixt together the blue solution vanished slowly while its color
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used to heat a strip of copper foil in the Bunsen burner. The copper was allowed time to cool and the spatula was used to scrape its surface. Also a strip of Magnesium was heated in the bunsen burner and when it combusted it was held over the ceramic plate. In part 2 of the lab 3 scoops of hydrogen carbonate were heated in a test tube and a lit wooden splint was put in the opening of the test tube. Also in part 2 of the lab the same steps were repeated with copper sulfate. In part 3 of the lab
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