I have thisquestion i am unsured about, an explanation and asnwer would be aweso
ID: 800498 • Letter: I
Question
I have thisquestion i am unsured about, an explanation and asnwer would be awesome!
I placed an * next to what i believe is the answer.
1. Which of the following is a weak electrolyte in aqueous solution?
[A] HCl
[B] NaCl
[C] Al (NO3)3
[D] HC2H3O2 *
[E] NH4Cl
2. Which of the following chemical reactions is an oxidation-reduction reaction?.
[A] CO2 + H2O -> H2CO3
[B] Pb(NO3)2 +2HCl -> PbCl2 + 2HNO3
[C] H2SO4 +Ba(OH)2 -> BaSO4 + 2H2O
[D] NH3 + HCl -> NH4Cl
[E] Mg + CO2 -> MgO + CO *
3. Identify the spectator ion(s) in the following reaction:
Cu(OH)2 (s) + 2H(+) (aq) + 2Cl(-)(aq) -> Cu(2+)(aq) + 2Cl(-)(aq) + 2H2O(l)
[A] Cu(2+) and Cl-
[B] H+ and Cl-
[C] Cu(OH)2
[D] Cl- *
[E] Cu(2+)
4. Identify the spectator ion(s) in the following reaction:
Zn(OH)2(s) + 2K(+)(aq) + 2OH(-)(aq) -> 2K(+)(aq) +Zn(OH)4(-)(aq)
[A] K+ and OH-
[B] Zn(OH)2
[C] K+ *
[D] K+ and Zn(OH)4(2-)
[E] Zn(OH)4(2-)
5. Which net ionic equation best represents the reaction that occurs when an aqueous solution of barium chloride is mixed with an aqueous solution of sulfuric acid?
[A] BaCl2 + H2SO4 -> BaSO4 + 2HCL
[B] 2H+ (aq)+2Cl-(aq)-> HCl(g)
[C] Ba(2+)(aq) + SO4(2-)(aq) -> BaSO4 (s) *
[D] Ba(2+)(aq)+2Cl-(aq)+2H+(aq)+SO4(2-)(aq)-> BaSO4(s)+2HCl(g)
[E] No net reaction occurs.
6. What is the net ionic equation for the acid-base reaction that occurs when acetic acid and sodium hydroxide solutions are mixed?
[A]H+(aq)+OH-(aq) -> H2O(l) *
[B]H3O+(aq)+OH-(aq)->2H2O(l)
[C]HC2H3O2(aq)+NaOH(aq)->NaC2H3O2(aq)+ H2O(l)
[D]C2H3O2-(aq) + H+(aq) Na+(aq) + OH-(aq) -> Na+(aq) + C2H3O2-(aq) + H2O(l)
[E] HC2H3O2(aq) + OH- (aq) -> C2H3O2-(aq) + H2O (l)
Explanation / Answer
1 ) D - HC2H3O2 is CH3COOH which is weak acid ( waekly dissociative and hence weak electrolyte)
2) E - here Mg is oxdised from 0 to +2 while C is reduced from +4 to + 2.
3) D- A spectator ion is one which doesnot involve in net reaction i.e which doesnot change its ionic state , hence Cl-
4) C- for same reason as above mentioned here K+ doesnot change its ionic state on both sides( reactant side and product side)
5) C - in net ionic equation spectator ions are eliminated , hence Ba2+(aq) + SO42-(aq) ------> BaSO4(s)
6) E- CH3COOH + OH-(aq) ---------> Ch3COO-(aq) + H2O (l) here in NaOH Na+ ion is spectator ion and hence reomved in net ionic equation.