The Elements: Potassium

Potassium is a reactive element that oxidizes in air and reacts explosively with water, producing hydrogen gas and potassium hydroxide. Despite its reactivity, potassium is vital for life, supporting muscle, kidney, and heart health, and is crucial for plant growth. It is abundant in the Earth's crust, making it the seventh most common element.

What happens when potassium comes into contact with water?

• It changes color but remains solid.

• It dissolves without any reaction.

• It reacts explosively, producing hydrogen gas.

• It forms a stable compound.

What is the color of the flame when hydrogen gas from potassium burns?

• Red

• Blue

• Lilac

• Green

Why is potassium considered essential for life?

• It is used in making jewelry.

• It helps maintain healthy bodily functions.

• It is a primary source of energy.

• It is used in construction materials.

In what forms can potassium compounds be found in nature?

• Only in rocks

• In salt, oil, and seawater

• Only in plants

• In metals and alloys

What percentage of the Earth's crust is made up of potassium?

• 25%

• 5%

• 10%

• 50%