Elements, Compounds, and Mixtures

Front

What is an element?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means. Examples include hydrogen (H), oxygen (O), and gold (Au).

Front

What is a compound?

Back

A compound is a substance formed when two or more elements are chemically bonded together. Examples include water (H2O) and carbon dioxide (CO2).

Front

What is a mixture?

Back

A mixture is a combination of two or more substances that are not chemically bonded. Mixtures can be homogeneous (uniform composition) or heterogeneous (distinct, separate components).

Front

What is a homogeneous mixture?

Back

A homogeneous mixture is a mixture that has a uniform composition throughout. An example is saltwater, where the salt is evenly distributed in the water.

Front

What is a heterogeneous mixture?

Back

A heterogeneous mixture is a mixture where the components are not uniformly distributed, and different parts can be seen. An example is a salad.

Front

What is the difference between a pure substance and a mixture?

Back

A pure substance has a constant composition and distinct properties, while a mixture contains two or more substances that retain their individual properties.

Front

What happens when electricity passes through water?

Back

When electricity passes through water, it causes the water to break down into hydrogen and oxygen gases, demonstrating the process of electrolysis.

Front

What is the chemical formula for water?

Back

The chemical formula for water is H2O, indicating that each molecule consists of two hydrogen atoms and one oxygen atom.

Front

What is the significance of the periodic table in understanding elements?

Back

The periodic table organizes all known elements based on their atomic number, electron configuration, and recurring chemical properties, helping to understand their relationships.

Front

What is an example of a compound?

Back

An example of a compound is carbon dioxide (CO2), which consists of one carbon atom and two oxygen atoms chemically bonded together.