Elements, Compounds, Mixtures

Front

What is a pure substance?

Back

A material that has a constant composition and consistent properties throughout. Examples include elements and compounds.

Front

Define an element.

Back

A pure substance that cannot be broken down into simpler substances by chemical means. Examples include hydrogen (H) and oxygen (O).

Front

What is a compound?

Back

A substance formed when two or more elements are chemically bonded together. Example: Water (H2O) is a compound made of hydrogen and oxygen.

Tags

NGSS.MS-PS1-1

Front

What is a mixture?

Back

A combination of two or more substances that are not chemically bonded. Examples include air and salad.

Front

What is the difference between a homogeneous mixture and a heterogeneous mixture?

Back

A homogeneous mixture has a uniform composition throughout (e.g., saltwater), while a heterogeneous mixture has a non-uniform composition (e.g., salad).

Front

What is a solution?

Back

A homogeneous mixture where one substance (the solute) is dissolved in another (the solvent). Example: Sugar dissolved in water.

Front

What is the chemical symbol for Zinc?

Back

Zn

Front

What is a molecule?

Back

A group of two or more atoms bonded together. Example: A water molecule (H2O) consists of two hydrogen atoms and one oxygen atom.

Tags

NGSS.MS-PS1-1

Front

What is an atom?

Back

The smallest unit of an element that retains the properties of that element. Atoms consist of protons, neutrons, and electrons.

Tags

NGSS.MS-PS1-1

Front

What is a chemical reaction?

Back

A process that involves the rearrangement of the molecular or ionic structure of a substance, resulting in the formation of new substances.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5