ls the following reaction exothermic or endothermic? C_3 Ha + 5O_2 rightarrow 3C
ID: 998785 • Letter: L
Question
ls the following reaction exothermic or endothermic? C_3 Ha + 5O_2 rightarrow 3CO_2 + 4H_2 O + heat Endothermic Exothermic When a sample of ammonium nitrate is dissolved in water, the temperature changes from 25 degree C to 20 degree C. Based on this observation, which of these is true for this process Delta H for the system is positive and the process is endothermic. Delta H for the system is positive and the process is exothermic. Delta H for the system is negative and the process is exothermic. Delta H for the system is negative and the process is endothermic. In the following reaction, what species is the oxidizing agent? 2Al(s) + 6 H^+(aq) rightarrow 2 Al^3+(aq) + 3 H_2(g) Al H^+ AI^3+ H_2 Choose the proper set of coefficients for each substance to balance this equation 1, 1, 2, 2 1, 3, 2, 2 2, 3, 4, 2 2, 2, 4, 2Explanation / Answer
16) Form product side, + heat means there is a release of heat (energy). So, this reaction is exothermic.
If you think in another way, this is a combustion/burning of propane (reaction with oxygen) which is a highly heat releasing process.
17) Temperature change from 25 to 20 oC means decreasing temperature, hence absorption of heat during dissolution process that means endothermic process. This means H is positive. So, option (a).
[A relatively easy way to determine whether or not a reaction is exothermic or endothermic is to determine the sign of H. If H is positive, the reaction is endothermic, that is heat is absorbed by the system due to the products of the reaction having a greater enthalpy than the reactants. On the other hand, if H is negative, the reaction is exothermic.]
18) H+ as it is getting reduced to H2 in product side (ie. +1 to 0 oxidation state).
19) Option (b)
1C2H4 + 3O2 ------> 2CO2 + 2H2O
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