Name Aukoh Be Student ID/No.0024940112 11/2R/17 2. Chemical Reactions and Equati
ID: 589466 • Letter: N
Question
Name Aukoh Be Student ID/No.0024940112 11/2R/17 2. Chemical Reactions and Equations evidence of a chemical reaction might you see in the following? (2 points each) a. Dropping an Alka-Seltzer tablet into a glass of water b. Bleaching a stain c. Buming a match d. Rusting of an iron nail (B). Balance and classify the reactions below as combination, decomposition, single replacement, double replacement, or combustion. (4 points each) Ca(NO3)2(aq) + NaCI(aq) CaCl2(aq) NaNotac) + Fe(s) H2SOdaq) FedSOJ3(aq) + H2(g) + - H2O2(1) H2O (l) + O2(g) 02(g) CO2(g) H2O(l) + C,H10(g) + Mg(s) + O2(g) MgO(s) CHE 101-Lab Test 2_ Fall 2017Explanation / Answer
2. (A) evidence of chemical reaction when,
a. dropping of alka-seltzer tablet into a glass of water : the evolution of CO2 bubbles by the reaction of citric acid with NaHCO3 tablet.
b. bleaching of stain : The stain will either disappear or the color would diminish.
c. Burning a match : the match burns with a spark in prescence of oxygen in air, it continues until all of match is burnt out.
d. Rusting of iron nail : the nail would have a brown deposit of rust which is oxide of iron. The rust can be wiped off and the nail weight would reduce accordingly.
(B) type of reaction
Ca(NO3)2(aq) + 2NaCl(aq) ---> CaCl2 + 2NaNO3 --- double displacement
Fe(s) + H2SO4(aq) --> FeSO4(aq) + H2(g) --- single displacement
2H2O2(l) ---> 2H2O(l) + O2 --- decomposition reaction
2C4H10O2(g) + 11O2(g) --> 8CO2(g) + 10H2O(l) --- Combustion reaction
2Mg(s) + O2(g) --> 2MgO(s) --- combination reaction
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