Elements, Compounds and Abundant Earth Elements (Flashcard Grade)

Front

What is an element?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means. It consists of only one type of atom.

Front

What is a compound?

Back

A compound is a substance formed when two or more elements chemically bond together in fixed proportions.

Front

What is the chemical formula for water?

Back

H₂O

Front

What is the most abundant element in the Earth's atmosphere?

Back

Oxygen (O) is the most abundant element in the Earth's atmosphere.

Front

What is the atmosphere?

Back

The atmosphere is the layer of gases surrounding the Earth, composed mainly of nitrogen, oxygen, and other gases.

Front

What is the hydrosphere?

Back

The hydrosphere includes all the water on Earth, including oceans, rivers, lakes, and water vapor in the atmosphere.

Front

What is the geosphere?

Back

The geosphere refers to the solid parts of the Earth, including rocks, soil, and the Earth's interior.

Front

What is the biosphere?

Back

The biosphere is the global sum of all ecosystems, where life exists on Earth.

Front

What is the role of nitrogen in the atmosphere?

Back

Nitrogen makes up about 78% of the Earth's atmosphere and is essential for the growth of plants.

Front

What is the elemental composition of the ocean?

Back

The ocean is primarily composed of water (H₂O) and contains dissolved salts, minerals, and gases.