Write a balanced chemical equation for each single replacement reaction.
A) Au(s) + KNO3(aq) ==> ???
B) Al(s) + H2SO4(aq) ==> ???
When you are told it is a single replacement reaction, that is telling you how to write the products, IF a reaction occurs. A single replacement means the single material, since it is a metal, will replace the positive ion in the "other" molecule. But that happens only if the metal is ABOVE the ion in the activity series.
Al + H2SO4 ==> Al2(SO4)3 + H2. Note the Al ion replaces H^+ since Al is above H in the activity series. I'll let you look us Au and K for the first one.
Au(s) +
I didn't balance it.
A) Au(s) + KNO3(aq) ==> Au(NO3)3(aq) + K(s)
B) Al(s) + H2SO4(aq) ==> Al2(SO4)3(aq) + H2(g)
To write balanced chemical equations for single replacement reactions, you need to identify the reactants and products and ensure that the number of atoms of each element is conserved.
A) Au(s) + KNO3(aq) ==> ???
In this reaction, gold (Au) is reacting with potassium nitrate (KNO3) to form new products. To determine the products, we need to determine the reactivity series, which tells us which elements are more likely to replace others in a reaction. In general, elements higher up in the reactivity series can replace elements lower down.
To determine if gold can replace potassium (K), we need to compare their positions in the reactivity series. Gold, being a noble metal, does not readily undergo reactions and is typically unreactive compared to potassium. Therefore, gold cannot replace potassium in this reaction.
Since no reaction occurs between gold and potassium nitrate, the balanced chemical equation for this reaction would be:
Au(s) + KNO3(aq) ==> No Reaction
B) Al(s) + H2SO4(aq) ==> ???
In this reaction, aluminum (Al) is reacting with sulfuric acid (H2SO4) to form new products. Again, we need to determine the reactivity series to identify whether aluminum can replace hydrogen (H) in the acid.
Aluminum is higher in the reactivity series than hydrogen, so it can replace hydrogen in an acid. The resulting products will be aluminum sulfate (Al2(SO4)3) and hydrogen gas (H2).
The balanced chemical equation for this single replacement reaction is:
2Al(s) + 3H2SO4(aq) --> Al2(SO4)3(aq) + 3H2(g)