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What is an amphoteric oxide? Name two. Write the equations of zinc oxide with hydrochloric acid and…
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What is an amphoteric oxide? Name two. Write the equations of zinc oxide with hydrochloric acid and with sodium hydroxide.
Need a reminder? The key ideaShow
Metals form basic oxides; aluminium and zinc oxides are amphoteric. Reactivity with water: K, Na violent; Ca cold water; Mg hot water; Al, Zn, Fe steam; Pb, Cu, Ag, Au none. Metals above hydrogen give hydrogen with dilute acids. A metal displaces those below it from their salt solutions.
The worked solution
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Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. An amphoteric oxide reacts with both acids and bases to give a salt and water. Examples: aluminium oxide and zinc oxide.
Step 2. With acid. .
Step 3. With base. .
Answer: as above.
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