8) AS is negative for the reaction A)2502 (g) +02 (g) 250g) B) NH4Cl (s) NH3 (g)

Question

8) AS is negative for the reaction A)2502 (g) +02 (g) 250g) B) NH4Cl (s) NH3 (g) + HCl (g) C) PbCl2 (s) P,2+ (aq) + 2a-(aq) D) 2C (s) + O2 (g) 2CO2 (g E) H2O (l) H2O (g) 9) Which element is reduced in the reaction below? Fe(CO)5 (l) + 2HI (g) Fe(CO412(s) + CO(g) + H2 (g) A) Fe B) C D) H E)I 10) Which element is reduced in the reaction below? Fe2+ + H++ Cr2072-Fe3+ + Cr3+ + H2O A) Fe B) Cr C) o D) H 11) Which one of the following reactions is a redox reaction? A) NaOH + HCl NaCl + H2O C) AgNO3 + HCI HNO3 + Aga D) None of the above is a redox reaction

Explanation / Answer

Q8

SRxn = negative only if the system decrease sin chaos/is ordered

a)

true, since 2+1 = 3 mol of gase form only 2

b)

false, since solid, ordered system produces 2 mol of gas, chaotic

c)

false, a crystal lattice is broken into ionic species

d)

false, there is 2 mol of gas creation

e)

gas is formed, therefor eincrease

from the list choose A

Q9

reduced --> gains electrons

H goes from H = +1 in HI to 0 in H2, then it gains 1 electron

Q10

element reduced --> must gain electrons

H remains as +1,

Fe goes from +2 to +3

then

Cr is being reduced ( it loses oxygens, i.e. oxidatin state decreases)

choose Cr

Q11

redox --> requires reduction + oxidation reactions

from the list

no species is reducing/oxidizing

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