MediumChemistryHigh School (9–10)GeneralMetals and Non-metals › Reactions and the Reactivity SeriesNumericalBoard Exam
Write the balanced equation for the reaction of each with water…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
Write the balanced equation for the reaction of each with water.
- Potassium with cold water.
- Calcium with cold water.
- Magnesium with hot water.
- Iron with steam.
Which gas do all of them give?
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
Have you tried it?
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. (a) .
Step 2. (b) .
Step 3. (c) .
Step 4. (d) .
Answer: all give hydrogen.
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