Front

What happens to oxygen when it forms an ion?

Back

Oxygen gains two electrons and has a charge of -2.

Front

What is the first step in every scientific experiment?

Back

The first step is to identify the question or problem.

Front

What type of composition of matter is milk?

Back

Milk is a homogeneous mixture.

Front

What is a substance made up of atoms of two or more different elements joined by chemical bonds?

Back

A compound.

Front

What type of bond is represented by a single line between two atoms?

Back

A single bond.

Front

What are valence electrons?

Back

Valence electrons are the electrons in the outermost shell of an atom that are involved in forming bonds.

Front

What is the difference between a compound and a mixture?

Back

A compound is a substance formed when two or more elements are chemically bonded, while a mixture is a combination of two or more substances that are not chemically bonded.

Front

What is an ionic bond?

Back

An ionic bond is a type of chemical bond formed through the electrostatic attraction between oppositely charged ions.

Front

What is a hypothesis in scientific research?

Back

A hypothesis is a testable statement or prediction about the relationship between two or more variables.

Front

What is the definition of a homogeneous mixture?

Back

A homogeneous mixture is a mixture in which the composition is uniform throughout.