4 compare the colour of the solutions with the chart

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4. Compare the colour of the solutions with the chart and record the pH of the final solution. Results: Type of reaction Observation Heating a carbonate limewater turns cloudy green solid turns black Reaction of a carbonate with an acid limewater turns cloudy Heating a metal bright light produced white powder produced Reaction of a metal with a dilute acid lighted wooden splinter produces ‘pop’ sound Precipitation reaction pale yellow precipitate formed Metal displacement reaction acidified potassium dichromate (VI) turns from orange to green Neutralization reaction a red solution with pH 2 turns to greenish-yellow solution with pH 7
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Questions for Discussion: 1. Write balanced equations for all the experiments above. A. (g) O O(l) 2H (s) MnO (aq) O 2H (s) MnO 2 2 2 2 2 2 B. (g) 2CO 2CuO(s) (g) O (s) 2CuCO 2 2 3 C. O(l) H (g) CO (aq) CaCl 2HCl(aq) (s) CaCO 2 2 2 3 D. (g) H (aq) MgCl 2HCl(aq) Mg(s) 2 2 E. 2MgO(s) (g) O 2Mg(s) 2 F. O(l) H (g) SO 2NaCl(aq) 2HCl(aq) (s) SO Na 2 2 3 2 G. (aq) NaNO AgBr(s) NaBr(aq) (aq) AgNO 3 3 H. O(l) H NaCl(aq) NaOH(aq) HCl(aq) 2 2. Write the ionic equations for the appropriate reactions. C. O(l) H (g) CO (aq) 2H (aq) CO 2 2 2 3 D. (g) H (aq) Mg (aq) 2H Mg(s) 2 2 F. O(l) H (g) SO (aq) 2Na (aq) 2H (s) SO Na 2 2 3 2 G. AgBr(s) (aq) Br (aq) Ag H. O(l) H (aq) OH (aq) H 2 3. Briefly describe how you would test for the following gases: a. Ammonia - White fumes of ammonium chloride are formed when a rod dipped in concentrated hydrochloric acid is brought near ammonia gas. b. Water vapour - Water vapour turns blue cobalt chloride paper pink. c. Chlorine - Chlorine turns moist blue litmus paper red and then bleached.
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4. Briefly describe how you would distinguish between bromine gas and nitrogen dioxide gas. Bromine is easily decolourised by alkenes. Bromide ion can also test by using silver nitrate and a cream precipitate will be formed. Nitrogen dioxide will not undergo these tests. It forms nitrates when in solution.
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  • Summer '17
  • Ms. Annie Mathews
  • Sulfuric acid, Sodium hydroxide, Reagents & Apparatus

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