90696 906960 For Supervisor’s use only 3 Level 3 Chemistry‚ 2008 90696 Describe oxidation-reduction processes Credits: Three 9.30 am Friday 28 November 2008 Check that the National Student Number (NSN) on your admission slip is the same as the number at the top of this page. You should answer ALL the questions in this booklet. A periodic table is provided on the Resource Sheet L3–CHEMR. If you need more space for any answer‚ use the page(s) provided at the back of this booklet and clearly
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Data Balanced equations: SrCl2 (aq) + KCl (aq) NO REACTION SrCl2 (aq) + Na2SO4 (aq) SrSO4 (s) + 2NaCl (aq) SrCl2 (aq) + 2NaOH (aq) Sr(OH)2 (s)+ 2NaCl (aq) SrCl2 (aq) + Na2CO3 (aq) SrCO3 (s) + 2NaCl (aq) AgNO3 (aq) + KCl (aq) AgCl (s) + KNO3 (aq) 2AgNO3 (aq) + Na2SO4 (aq) Ag2SO4 (s) + 2NaNO3 (aq) AgNO3 (aq) + NaOH (aq) AgOH (s) + NaNO3 (aq) 2AgNO3 (aq) + Na2CO3 (aq) Ag2CO3 (s) + 2NaNO3 (aq) BaCl2 (aq) + KCl (aq) NO REACTION BaCl2 (aq) + Na2SO4 (aq) BaSO4 (s) + 2NaCl (aq) BaCl2
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FREAR AND BURRELL-ASSIMILATION OF HYPONITRITE-NITROGEN tion of pyridine nucleotides by spinach grana and coupled carbon dioxide fixation. Nature 167: 768769. 1951. 29. VISHNIAC‚ W. and OCHOA‚ S. Fixation of carbon dioxide coupled to the photochemical reduction of pyridine nucleotides bv chloroplast preparations. Jour. Biol. Chem. 195: 75-93. 1952. 30. ZBINOVSKY. V. and BURRIS. R. H. Metabolism of 109 infiltrated organic acids by tobacco leaves. Plant Physiol. 27: 240-249. 1952. 31. ZUCKER‚
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Abstract: The objective of Experiment 1 was to observe some chemical changes. While observing the chemical changes in elements I also experimented with household cleaners to see how much chemical properties relate to our daily lives. Chemical changes occur all around me and I go without noticing them all the time without a second thought. This experiment opens my eyes to different chemical reactions occurring around me. This experiment also shows the importance of dilution. If I did not dilute something
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andPhenolphthalein | Substance unexpectedly remained clear | A-9/I | NaOH and AgNO3 | Substance became extremely cloudy and turned a brown color | A-10/J | AgNO3 and NH3 | Substance‚ after exposure to light‚ turned a dark brown color | A-11/K | NH3 and CuSO4 | Substance turned a cloudy light blue color |
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General ColleGe Chemistry LabPaq / Published by: Hands-On Labs‚ Inc. sales@HOLscience.com / www.HOLscience.com / Toll Free 866.206.0773 a laboratory manual of small-scale experiments for the independent study of General College Chemistry 50-0125-CK-01 LabPaq® is a registered trademark of Hands-On Labs‚ Inc. (HOL). The LabPaq referenced in this manual is produced by Hands-On Labs‚ Inc. which holds and reserves all copyrights on experiences. The laboratory manual included with a LabPaq
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change between a metal and a solution of a salt is related to the relative position of the two metals in the reactivity. Presumably the further apart in the series the bigger the enthalpy change will be. The experiment is as follows‚ 1) Zn(s) + CuSO4(aq) ZnSO4(aq) + Cu(s) 2) Zn(s) + Pb(NO3)2(aq) Zn(NO3)2 (aq) + Pb(s) Both of the solutions will be in 1mol.dm-3 Apparatus: Distilled Water Polystyrene Cup Polystyrene Lid for cup Thermometer 1mol.dm-3 Copper Sulphate
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Name ___________________________________________ Date ___________________________________ Block ____ Experiment 12A Investigating chemical equilibrium ABSTRACT 1. What is equilibrium and how can you tell it has been reached? __________________________________________________________________________________________ __________________________________________________________________________________________ __________________________________________________________________________________________
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NaHCO3+HCl b) HCl+Bromthymol blue c) NH3+1 drop Bromthymol blue d) HCl+blue dye e) Blue dye+NaOCl followed by HCl f) NaOCl+KI followed by various test foods g) KI+Pb(NO3)2 h) NaOH+phenolphthalein i) HCl + phenolphthalein j) NaOH+AgNO3 k) AgNO3+NH3 l) NH3+CuSO4. Along the way‚ observations were made pertaining to the reactions witnessed. This experiment concluded with testing household chemicals and proper disposal of lab chemicals. Observations: (10 of 20 points) CHEMICALS Well # Reaction on white paper
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reaction will be noticed. Hypothesis: • It is hypothesized the zinc metal will have a precipitation reaction with the solution of copper II sulfate‚ because zinc is more reactive then copper and it could displace the copper ions from the solution (CuSO4). And because of that there is no reaction between copper and the solution of copper II sulfate. Materials: Apparatus: Copper II sulfate Spot Plate Copper Wire Beaker Zinc Spoon Sodium Chloride (NaCl) Paper Towels Waste Petri Dish Gloves Lab
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