Atoms, Elements, Compounds, and Mixtures

This page delves into the fundamental building blocks of matter: atoms, elements, compounds, and mixtures. It provides clear definitions and distinctions between these concepts.

The page begins by stating that all matter is made up of atoms, which are small particles that cannot be directly seen. It then defines an element as a substance containing only one type of atom, emphasizing that different elements have distinct properties.

Definition: An element is a substance containing only one type of atom, and different elements have distinct properties.

The concept of compounds is introduced as substances made of atoms from different elements bonded together. The page highlights that compounds usually have completely different properties from the elements they are composed of. It also defines a molecule as two or more atoms bonded together.

Highlight: Compounds usually have completely different properties from the elements they are made up of.

Mixtures are described as substances made of two or more elements or compounds that are not chemically bonded to each other. The page notes that mixtures can be separated by physical methods and retain the properties of their constituent substances.

Example: A mixture of salt and water retains properties of both salt and water, and can be separated by evaporation.

The page also touches on the different states of matter (solid, liquid, gas) in relation to these concepts, reinforcing the connection between atomic structure and macroscopic properties of matter.

Vocabulary: A molecule is defined as two or more atoms bonded together.

This comprehensive overview provides a solid foundation for understanding the basic principles of atomic structure and composition of matter, which is crucial for further studies in chemistry and physics.