Elements, Compounds, Mixtures

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

A compound is a substance formed when two or more elements are chemically bonded together. An example is Water (H2O), which is made of Hydrogen and Oxygen.

A mixture is a combination of two or more substances that are not chemically bonded. Examples include air (a mixture of gases) and salad (a mixture of vegetables).

A pure substance consists of only one type of particle (either an element or a compound), while a mixture contains two or more different particles.

Salt (NaCl) is a compound because it is formed from the chemical combination of sodium (Na) and chlorine (Cl).

Brass is a mixture because it is made by combining two elements, zinc and copper, without a chemical reaction.

A homogeneous mixture is a mixture that has a uniform composition throughout, such as saltwater.

A heterogeneous mixture is a mixture where the components can be seen and are not uniform, such as a salad or a mixture of sand and pebbles.

The chemical formula for baking soda is NaHCO3, which is a compound.

Yes, mixtures can be separated into their components by physical means, such as filtration or distillation.