Question

question 23
1 pts
the following reaction can be classified as what type(s) of reaction(s)?
2 al(oh)3 (s) + 3 h2so4 (aq) → al2(so4)3 (aq) + 6 h2o (i)
o metathesis reaction
o redox reaction
o precipitation
o acid-base neutralization
question 24
1 pts
which reaction is an example of an acid-base reaction?
o h2so4 (aq) + ca(oh)2 (aq) → caso4 (aq) + 2 h2o(i)
o 6 hcl(aq) + 2 al(s) → 2 aici3 (aq) + 3 h2 (g)
o 2 hg(i) + o2(g) →2 hgo(s)
o h2co3 (aq) → h2o(i) + co2 (g)
o fecl3 (aq) + 3 koh(aq) → fe(oh)3 (s) + 3 kcl(aq)

Explanation:

Question 23

• Metathesis reaction: In a metathesis reaction, the cations and anions of two compounds exchange partners. Here, \(Al^{3 +}\) from \(Al(OH)_3\) and \(H^{+}\) from \(H_2SO_4\) exchange partners (\(Al^{3+}\) combines with \(SO_4^{2 -}\) and \(H^{+}\) combines with \(OH^{-}\)).
• Acid - base neutralization: \(Al(OH)_3\) is a base (\(OH^{-}\) donor) and \(H_2SO_4\) is an acid (\(H^{+}\) donor). They react to form a salt (\(Al_2(SO_4)_3\)) and water (\(H_2O\)), which is the characteristic of an acid - base neutralization reaction.
• Not redox: There is no change in oxidation states of \(Al\) (\(+ 3\) throughout), \(H\) (\(+1\) throughout), \(S\) (\(+6\) throughout), and \(O\) (\(-2\) throughout).
• Not precipitation: All the products (\(Al_2(SO_4)_3\) is aqueous and \(H_2O\) is liquid) are soluble (or liquid, not a solid precipitate).

Question 24

• For \(H_2SO_4(aq)+Ca(OH)_2(aq)\to CaSO_4(aq) + 2H_2O(l)\):
• \(H_2SO_4\) is an acid (\(H^{+}\) donor) and \(Ca(OH)_2\) is a base (\(OH^{-}\) donor). They react to form a salt (\(CaSO_4\)) and water (\(H_2O\)), which is the definition of an acid - base reaction.
• For \(6HCl(aq)+2Al(s)\to 2AlCl_3(aq)+3H_2(g)\):
• This is a single - displacement reaction. \(Al\) (a metal) displaces \(H\) from \(HCl\). Also, it is a redox reaction (\(Al\) goes from \(0\) to \(+3\) oxidation state and \(H\) goes from \(+1\) to \(0\) oxidation state).
• For \(2Hg(l)+O_2(g)\to 2HgO(s)\):
• This is a combination reaction and a redox reaction (\(Hg\) goes from \(0\) to \(+2\) oxidation state and \(O\) goes from \(0\) to \(-2\) oxidation state).
• For \(H_2CO_3(aq)\to H_2O(l)+CO_2(g)\):
• This is a decomposition reaction.
• For \(FeCl_3(aq)+3KOH(aq)\to Fe(OH)_3(s)+3KCl(aq)\):
• This is a precipitation reaction (a solid \(Fe(OH)_3\) is formed) and also a metathesis reaction (cations and anions exchange partners).

Answer:

Question 23

metathesis reaction, acid - base neutralization

Question 24

\(H_2SO_4(aq)+Ca(OH)_2(aq)\to CaSO_4(aq) + 2H_2O(l)\)