Reactivity of Metals with Water

The video tutorial explores the reactivity of different metal groups with water. Group 1 alkali metals react vigorously, with lithium and potassium as examples. Group 2 alkaline earth metals show varied reactivity, with beryllium being inert and strontium forming a precipitate. Transition metals and elements like tin and lead are generally inert in water. Aluminium forms a protective oxide layer, preventing further reaction.

What happens when lithium metal reacts with water?

• It forms lithium carbonate and carbon dioxide.

• It forms lithium hydroxide and hydrogen gas.

• It forms lithium oxide and hydrogen gas.

• It forms lithium chloride and oxygen gas.

What color does the universal indicator paper turn when testing the solution formed by lithium in water?

• Blue to purple

• Colorless

• Yellow to green

• Red to orange

Why is the reaction of potassium with water more violent than that of lithium?

• Potassium does not react with water.

• Potassium forms a different compound.

• Potassium is more reactive than lithium.

• Potassium is less reactive than lithium.

Which Group 2 metal is too inert to react with water?

• Calcium

• Barium

• Beryllium

• Strontium

What is observed when strontium reacts with water?

• A white precipitate

• A blue solution

• No reaction

• A red flame

Why are metal hydroxides not made by adding pure metals to water in industry?

• It is less efficient.

• It is too dangerous.

• It is too slow.

• It is more expensive.

How is strontium hydroxide typically produced in industry?

• By reacting strontium nitrate with a strong base

• By reacting strontium metal with water

• By reacting strontium oxide with water

• By reacting strontium carbonate with acid

Why do transition metals generally not react with water?

• They dissolve completely in water.

• They form stable compounds with water.

• They require too much energy to form ions.

• They are too reactive.

What is the role of molten tin in iron cans?

• To make the can more durable

• To prevent the can from rusting

• To enhance the flavor of the contents

• To react with water inside the can

What protective layer does aluminum form when reacting with water?

• Aluminum nitrate

• Aluminum sulfate

• Aluminum oxide

• Aluminum chloride