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. 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 a fixed ratio.

Front

What is a mixture?

Back

A mixture is a combination of two or more substances that are not chemically bonded and can be separated by physical means.

Front

What is a homogeneous mixture?

Back

A homogeneous mixture is a mixture that has a uniform composition throughout, meaning the different components are evenly distributed.

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 and separated.

Front

What happens when elements form a compound?

Back

When elements form a compound, chemical bonds are created between the atoms of the elements.

Front

What is a chemical bond?

Back

A chemical bond is the force that holds atoms together in a compound, which can be ionic or covalent.

Front

What is the difference between an element and a compound?

Back

An element consists of only one type of atom, while a compound consists of two or more different types of atoms chemically bonded together.

Front

What is the chemical formula for water?

Back

The chemical formula for water is H₂O, which indicates it is made of two hydrogen atoms and one oxygen atom.

Front

What is the chemical equation for the combustion of hydrogen?

Back

The chemical equation for the combustion of hydrogen is 2H₂ + O₂ → 2H₂O.