Chemistry Review 1

A nonmetal is an element that typically lacks the characteristics of metals, such as being a good conductor of electricity and heat. Nonmetals can be gases, liquids, or solids at room temperature.

Selenium is a nonmetal.

A heterogeneous mixture is a combination of two or more substances that are not uniformly distributed, meaning you can see the different components.

A taco is an example of a heterogeneous mixture.

A pure substance is a material made up of only one type of particle, which can be either an element or a compound.

Carbon Dioxide (CO2) is a compound.

A compound is a substance formed when two or more elements are chemically bonded together.

Nonmetals are generally poor conductors of electricity.

A homogeneous mixture is a mixture in which the composition is uniform throughout, and the different components are not distinguishable.

Saltwater is an example of a homogeneous mixture.