Mixing chemicals can sometimes produce vigorous, exothermic, and/or potentially
ID: 1028356 • Letter: M
Question
Mixing chemicals can sometimes produce vigorous, exothermic, and/or potentially hazardous results. Which pair of chemicals listed below can usually be mixed together WITHOUI a significant effect? (For this question, "significant effect means mixing the components together liberatesa gas, is highly exothermic, or similar dramatic changes.) IMPORTANT NOTE Do not "guess" on this question! If you do not recognize some of the chemical names or formulas listed below, or if you are unsure of the reactions, you can get FULL CREDIT for this question by using the "Explain your answer" box to provide at least TWo spesiic and reliable sources you could consult to get more information. HINT Writing-search the internet'ook in the library" is NOT specific enough. Writing 'ask my Magic 8 Ball" is not reliable enough. O A Adding MnO2 to H202. O B. Adding CH3COCH3 to concentrated HNO3. C. Adding calcium hypochlorite to polyglycol ethers. O D. Adding 3,3-bis(4-hydroxy-2-methyl-5 propan-2-ylphenyl)- 2-benzofuran-1-one to CH3CH2OH O E. Adding small amounts of H20 to concentrated H2504 F Adding NaoH (s) to 15.0 M NH4OH G. Adding NaHCOs to CHjCOOH H Adding H20 to P20 O Explain your answerExplanation / Answer
Reaction exothermic means energy released.we can calculate it easily from standard bond energies.from website.
In a reaction the bonds in reactants should break and new bonds are formed between elements in products.
The energy required to break the bonds in reactants is greater than energy required to form new bonds then the reaction is said to be exothermic .All the energy released by breaking bonds in reactants is not utilized in product formation.some heat is released.
In general combustion and neutralization reactions are exothermic.
E)sulfuric acid and water reaction means dissociation reaction and hydration reaction sulfuric acids dissociate into hydrogen and sulfate ions it is Endothermic and hydration of hydrogen ions produce large molecules and disorder decrease as number of molecules decrease as water molecules involved in hydration of hydrogen ion ant entropy decrease and temperature increases so in over all reaction energy is released and reaction is exothermic
A)adding manganese dioxide to hydrogen peroxide here manganese dioxide acts as catalyst and not involved in reaction hydrogen peroxide decomposes into water and oxygen gas.It is exothermic because in general all decomposition reactions exothermic.
H)phosphorous pentoxide reacts with water produce phosphoric acid and it is strongly exothermic.