FORM 4G ELECTROLYSIS WORKSHEET TERM 3 2010-2011 1.Figure 1 below is a diagram of the apparatus used in the electrolysis of fused sodium bromide. Figure 1 a)Write the formulae for the ions present in the fused sodium bromide. b)Write an ionic equation to represent the reaction taking place at the positive and negative electrodes. c)When the heat source was removed‚ the crucible cooled and the lamp went out. Explain why the lamp went out when the crucible cooled. d)At the end of the experiment
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chemical formula. In this experiment‚ we used the law of definite proportions to find the chemical formula for a hydrated compound containing copper‚ chlorine‚ and water molecules locked in the crystal structure of the solid compound of Copper Chloride Hydrate. First we will gently heat a sample of the compound to drive off the water of hydration. By measuring the mass of the sample before and after heating we can determine the amount of water in the sample. Second‚ we will conduct a chemical
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(2) State the observable change in this test and explain your answer. (8 marks) 3 4 4. HKCEE 1998 Q5 Each of five unlabelled bottles contains one of the following chemicals: 2 M hydrochloric acid 2 M nitric acid 2 M sodium chloride solution 2 M sodium hydroxide solution distilled water Suggest how you would carry out tests to identify the
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they are burned or added base. In these two experiments‚ scientist took some sample of barium hydroxide (Ba (OH) 2·H2O)‚ ferric chloride (FeCl3·6H2O)‚ copper chloride (CuCl2· 2H2O)‚ calcium chloride anhydrous (CaCl2)‚ potassium carbonate crystal (K2CO3· 2H2O)‚ strontium chloride hexahydrate (SrCl2· 6H2O)‚ lead nitrate (Pb (NO3) 2)‚ sodium chloride (NaCl) and magnesium chloride hexahydrate (MgCl2· 6H2O). In the first experiment‚ scientist used wet splint to dip in the powder of those samples above. The
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boiling points‚ and do not conduct electricity. Since electrons are shared in covalent bonds‚ they have slightly different properties than ionic-bonded compounds. Based on these properties‚ the best compound for your ceramic fixative would be sodium chloride (NaCl)‚ because it has an ionic bond‚ has a high melting and boiling point‚ is electrically conductive‚ dries white‚ and can dissolve in water but not in alcohol. When we conducted this experiment‚ we used distilled water to test if the compounds
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into a metal salt. (5) Dip your wire into a metal salt either the nitrate or chloride and place the wire onto the tip of the blue flame. (6) Observe the change in colour of the Bunsen burners flame and record the observations as you go. (7) As long as you clean the wire as directed in step 3-4 you can proceed into testing the other metal salts. QUESTIONS: Q1: Were there any main difference between the chloride salts and the nitrate salts? If there was please comment on what it was Yes‚
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metal leaving a vacancy that is filled by the replacement ligand. Under various conditions‚ Cobalt (III) is able to undergo substitution of its ligands. In this lab‚ carbonatotetraamminecobalt (III) nitrate was made. Substitution reactions using chloride‚ nitrite‚ and water were performed to make other Cobalt (III) complexes. They were gravimetrically measured to determine yields and properties. Experimental Step 1: 20.0053g (0.2101mol) of (NH4)2CO3 was added to 60mL of concentrated (14.8M) NH4OH
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Writing Complete Equations Practice For each of the following problems‚ write complete chemical equations to describe the chemical process taking place. Important note: There are a few physical processes on this sheet – You can’t write an equation for a physical process! 1) When lithium hydroxide pellets are added to a solution of sulfuric acid (dihydrogen sulfate)‚ lithium sulfate and water are formed. 2) When dirty water is boiled for purification purposes‚ the temperature is brought up to
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Chemistry : Important Questions For CBSE Class XII ( Haloalkanes and Haloarenes) (Q.1) Choose the incorrect statement about the benzyl chloride: ( 1 mark ) (a) It is less reactive than alkyl halides. (b) It can be oxidized to benzaldehyde by boiling with copper nitrate solution. (c) It is a lachrymatory liquid and answers beilstein’s test. (d) It gives a white precipitate with alcoholic silver nitrate (Q.2) Dry ether The reaction RX + 2Na + RX _______________? R-R + 2NaXis called. ( 1 mark
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Emission Spectra & Flame Tests Intro The emission spectrum is used in modern chemistry to help further studies of wavelengths and the spectrum. When a metal in a compound reacts in a flame and produces a color‚ it helps to show the strongest color in the emission spectrum. The purpose of performing these operations on the flame was to see how different metals would react. Using a spectroscope‚ it is possible to observe the line emission spectrum produced by sunlight‚ artificial light‚ and
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