Exploring Alkali Metals and Their Reactions with Water

Which of the following is NOT an alkali metal?

• Potassium

• Lithium

• Sodium

• Calcium

What happens to lithium when it is sliced?

• It melts instantly.

• It quickly forms a black coating.

• It catches fire.

• It remains shiny indefinitely.

Why is sodium stored under oil?

• To keep it shiny.

• To enhance its reactivity.

• To prevent it from reacting with air.

• To make it easier to cut.

Which alkali metal's reaction with air is so fast that its metallic lustre is hard to see?

• Cesium

• Sodium

• Potassium

• Lithium

What gas is produced when lithium reacts with water?

• Nitrogen

• Carbon dioxide

• Oxygen

• Hydrogen

How does the reaction of sodium with water compare to that of lithium?

• It is less vigorous.

• It is more vigorous.

• It produces a different gas.

• It does not produce any gas.

What is the charge of the aqueous cation formed when alkali metals dissolve in water?

• -1

• 0

• +1

• +2

What color flame is observed when potassium reacts with water?

• Blue

• Red

• Lilac

• Green

Why is a safety screen used when reacting rubidium with water?

• To prevent the metal from escaping.

• To protect from the intense reaction.

• To enhance the reaction.

• To observe the reaction more clearly.