Observing Chemical Reactions

Experimental there was no quantitative data in this

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senses, except taste, to record the physical properties of each product. Experimental There was no quantitative data in this experiment, just a set of observations shown in Table 1 . Experiment Observations pH Before pH After Type of Reacti
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A1 Reaction bubbled while NaHCO 3 dissolves. Solution feels cool through test tube Faint smell of vinegar At first reaction occurs fast, then slows down CH 3 COOH: 4 Acidic Solution: 7 Neutral Double Displacem B2 Formation of a cloudy precipitate which does not settle evenly in solution Smells like a burnt match MgCl 2 :6 NaOH: 12 One slightly acidic, second basic Solution: 9 Basic Double Displace C1 Extremely slow reaction Iron slowly dissolves which is noticeable in the bubbles A very small amount of hydrogen is formed HCl:1 Acidic Solution: 1 No change Single Displacem D1 Bubbles formed in hydrogen peroxide when potato was added. When splint is added grey smoke formed inside test tube H 2 O 2 :6 Slightly acidic Solution: 6 No change Decompositio E1 Temperature increase Neutralization reaction H 2 SO 4 : 1 NaOH:10+ One very acidic, other very basic Solution: 7 Neutral Double displacem neutralization F2 Surface of copper after reaction is black Substance is flaky and can easily be scraped off to reveal copper underneath Not applicable Not applicable Combination The type of equation can be determine using the molecular formula which is given in the table below because it could not fit in table 1. Table 2 is a break down of the molecular or whole formula and the net ionic equations Experiment Molecular Formula Net Ionic Equation A1 NaCHO 3 (s)+CH 3 COOH(aq) NaCH 3 COO(aq)+H 2 CO 3 (aq) NaHCO 3 (s)+H + (aq) Na + (aq)+H 2 O(l)+CO 2 (g) B2 MgCl 2 (aq)+2NaOH(aq) 2NaCl(aq)+Mg(OH) 2 (s) Mg 2+ (aq)+2OH - (aq) Mg(OH) 2 (s) C1 Fe(s)+2HCl(aq) FeCl 2 (aq)+H 2 (g) Fe(s)+2H + (aq) Fe 2+ (aq)+H 2 (g) D1 2H 2 O 2 (aq)-(catalyst)->2H 2 O(l)+O 2 (g) Net Ionic same as Whole formula E1 2NaOH(aq)+H 2 SO 4 (aq) Na 2 SO 4 (aq)+2H 2 O(l) 2OH - (aq)+2H + (aq) 2H 2 O(l) F2 4Cu(s)+O 2 (g) 2Cu 2 O(s) Net Ionic same as Whole formula For reaction A1 the whole formula shows the formation of H 2 CO 3 , yet that product is not listed in the net ionic equation. This is because H 2 CO 3 breaks down almost instantaneously to produce H 2 O and CO 2 which are the products given in the net ionic equation since those chemicals form stably. Table 3 is more analysis of reactions, which will be explained further in discussion section Experiment How I knew reaction took place Green Chemistry Principles used in Selecti A1 Formation of bubbles, change in temperature, smell 1, 3, 4 B2
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