strips that are stained with dark‚ reddishbrown stuff. Part II: Decomposition of hydrogen peroxide Appearance of potato and hydrogen peroxide combination: Lots of white‚ foamy bubbles around the potato slices. Day 2 Observations: Part III: Reaction between zinc and acetic acid Appearance of penny in vinegar after 30 minutes: Pretty dark coloured. Quite hard to see Lincoln’s head or the Memorial. Part IV: Reaction between baking soda and vinegar Description of what happened when the baking soda and vinegar were combined Immediately
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the different reactions formed between various acids and bases with the aid of indicators. Equipment: 1. Safety goggles. 2. Droppers. 3. Red Litmus paper. 4. Blue Litmus paper. 5. pH paper. 6. Well plate. 7. Micro spatula. Materials: 1. Zinc. 2. Magnesium. 3. Iron. 4. Copper. 5. HCL. 6. HC₂H₃O₂. 7. NaOH. 8. Phenolphthalein. Procedure: Part A: 1. Add five drops of HCL‚ HC₂H₃O₂‚ and NaOH to different depressions in the well plate. 2. Place a drop of each solution onto a piece
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peroxide combination ________________________ Day 2 Materials: Part III: a penny dated after 1983 metal file or coarse sandpaper vinegar (CH3COOH) Part IV: baking soda (NaHCO3) vinegar (CH3COOH) cup spoon Procedures: Part III: Reaction between zinc and acetic acid 1. Use a file or sandpaper to completely remove the
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Chapter 1 Chemical Reactions and Equations Q.1. Why should magnesium ribbon be cleaned before burning in air ? Ans: Magnesium ribbon is a very reactive metal. When stored it reacts with oxygen to form a layer of magnesium oxide on its surface. This layer of magnesium oxide being a stable compound prevents further reaction of magnesium with oxygen. The magnesium is cleaned before burning in air to remove this layer so that the metal can be exposed to air properly. Q.2. Write the balanced
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We take for granted much of what we have in the world today. Our basic necessities – food‚ shelter and clothing – are easily accessible to nearly everyone in the developed world‚ and things that were once considered luxury items‚ such as televisions and refrigerators‚ have become common items in even the poorest of homes. Why do we have all of these possessions so readily available to us? Leonard Read’s explanation can be found in his examination of a pencil’s life. Read considers it a miracle
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this work‚ half equations are always shown with electrons on the left. If these two half cells are connected then the same reaction takes place as when a piece of zinc is put into a copper solution: wire Zn salt bridge Cu Redox – revision When a piece of zinc is placed in a copper salt solution the copper ions are displaced – zinc is more reactive than copper ions: Zn(s) + Cu (aq) ➝ Zn (aq) + Cu(s) 2+ 2+ You will recognise this from the reactivity series of metals at GCSE level. If we now
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What precipitation reaction could be used to separate and remove silver ions from a mixture containing iron (III) and zinc ions? A precipitation reaction that could be used is hydrochloric acid Ag+(aq) + HCl(aq) AgCl(s) +H+(aq) – white. 2. What precipitation reaction could be used to separate and remove iron (III) ions from the remaining mixture containing iron (III) and zinc ions? Fe3+(aq) + 3NaOH(aq) Fe(OH)3(s) + 3Na+(aq) 3. How can the presence of silver ions be positively identified?
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charges and the repulsion of particles with the same charge. Electricity from a lemon is possible to get electricity from a lemon using strips of metal. The most readily available combination is copper and zinc. The zinc piece can be taken from the casing of an old carbon "D" cell (battery); some zinc coated nails may work as well. The copper can be a coin containing a high amount of copper. They are stuck into the lemon‚ and wires are attached to each one. The wires should be attached securely to form
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Honors 1-18-12 Relative Solubility of Transition Elements Introduction: In this lab we evaluate the solubility of compounds of iron‚ copper‚ zinc‚ and mercury in both water and acid. Coming into the lab we know that iron‚ copper‚ and zinc are all found in the the same row of the periodic table‚ while zinc and mercury are found in the same column. The transition metals are found in groups 3 to 12 and periods 4 to 6. Rows are known as periods and columns are known as groups. They share characteristics
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MATERIALS : METALS AND NON-METALS Y Iron Coal ou are familiar with a number of materials like iron‚ aluminium‚ copper‚ etc. Some materials have been given in Table 4.1. Table 4.1 : Appearance and Hardness of materials Object /Material Appearance Hardness (Shiny/Dull) (Very hard/ Not very hard) similar change if we try to beat a wood log ? Let us find out. Activity 4.1 Take a small iron nail‚ a coal piece‚ a piece of thick aluminium wire and a pencil lead. Beat the iron nail with
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