Question

8 multiple choice 2 points recall what happened when iron filings were reacted with cuso4 (aq). what can one say about the relative reactivities of iron and copper? they are equally reactive fe is more reactive than cu cu is more reactive than fe the reactivities cant be judged 9 multiple choice 2 points magnesium metal reacts with hydrochloric acid to produce a flammable gas. what is the gas? a ch4 b. o2 c. mgcl2 d. h2 a b c d

Explanation:

Question 8

When iron filings react with \(CuSO_4(aq)\), a displacement reaction occurs. In a displacement reaction, a more reactive metal displaces a less reactive metal from its salt solution. Here, iron displaces copper from \(CuSO_4\).

The reaction between magnesium metal (\(Mg\)) and hydrochloric acid (\(HCl\)) is a single - displacement reaction. The chemical equation is \(Mg + 2HCl=MgCl_2 + H_2\uparrow\). Methane (\(CH_4\)) is not formed in this reaction. Oxygen (\(O_2\)) is not formed as there is no oxygen source in the reactants (other than the acid which is \(HCl\)). \(MgCl_2\) is a solid (salt) formed in the reaction, not a gas. Hydrogen gas (\(H_2\)) is flammable.

Answer:

Fe is more reactive than Cu

Question 9