which metal would not displace gold, au, from a compound?\ncopper, cu\npotassium, k\nmagnesium, mg\nnone of…
which metal would not displace gold, au, from a compound?\ncopper, cu\npotassium, k\nmagnesium, mg\nnone of them\nidentify the type of chemical reaction given here: c₂h₄(g) + 3o₂(g) → 2co₂(g) + 2h₂o(g)\nsynthesis\ndecomposition\ncomplete combustion\nincomplete combustion\nclassify the following reaction: mg(oh)2 + 2hno3 ------->mg(no3)2 + 2h2o\nsynthesis\ndecomposition\nsingle displacement\ndouble displacement
Answer
Explanation:
Step1: Recall metal - activity series
In the metal - activity series, a more reactive metal can displace a less reactive metal from its compound. Gold is a very less reactive metal. Potassium and magnesium are highly reactive metals and can displace gold. Copper is also more reactive than gold in terms of metal - displacement reactions. So, none of these metals would not displace gold.
Step2: Identify reaction type of $C_{2}H_{4}+3O_{2}\rightarrow2CO_{2}+2H_{2}O$
A complete combustion reaction of a hydrocarbon produces carbon dioxide and water. Here, ethylene ($C_{2}H_{4}$) reacts with oxygen to form carbon dioxide and water, which is a complete combustion reaction.
Step3: Identify reaction type of $Mg(OH){2}+2HNO{3}\rightarrow Mg(NO_{3}){2}+2H{2}O$
In a double - displacement reaction, the positive and negative ions of two ionic compounds exchange places. Here, the $Mg^{2 + }$ ion from $Mg(OH){2}$ and the $H^{+}$ ion from $HNO{3}$ exchange places with the $OH^{-}$ ion from $Mg(OH){2}$ and the $NO{3}^{-}$ ion from $HNO_{3}$ respectively.
Answer:
- D. none of them
- C. complete combustion
- D. double displacement