Alkali Metals and Water Reaction

Which of the following alkali metals may not react as vigorously due to a protective oxide layer?

• Sodium

• Potassium

• Rubidium

• Lithium

What type of solution is formed when alkali metals react with water?

• Acidic

• Basic (alkaline)

• Neutral

• Saline

Which alkali metal reacts most vigorously with water?

• Lithium

• Sodium

• Potassium

• Rubidium

Which ion is responsible for the alkaline nature of the solution formed when potassium reacts with water?

• K+

• OH-

• H+

• H2⁺

What happens when alkali metals react with water in terms of their size?

• They shrink in size.

• They remain the same size.

• They expand in size.

• The size change is unpredictable.

Tags

NGSS.HS-PS1-2

Why are alkali metals stored under oil or inert gases?

• To prevent them from reacting with air

• To prevent them from reacting with water

• To prevent them from reacting with oxygen

• All of the above

What is the general trend in reactivity of alkali metals with water as you go down the group?

• Reactivity increases

• Reactivity decreases

• Reactivity remains constant

• Reactivity is unpredictable

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

What is the equation for the reaction between potassium and water?

• 2K+2H2​O→2KOH+H2​

• 2K+H2​O→2KOH+H2​

• K+2H2​O→KOH+H2​

• K+H2​O→KOH+H2​

What is the primary product formed when alkali metals react with water? (pick two)

• Hydroxide ions (OH⁻)

• Hydrogen gas (H₂)

• Metal hydroxide

• Metal oxide

Tags

NGSS.HS-PS1-1

Alkali metal-water reactions are highly exothermic. What does this mean?

• They absorb heat from the surroundings.

• They release heat to the surroundings.

• They do not involve any heat changes.

• They are reversible reactions.

Tags

NGSS.HS-PS1-4