8th grade Science midterm

Front

What is a subscript in a chemical formula?

Back

A subscript is a number written below and to the right of a chemical symbol that indicates the number of atoms of that element in a molecule.

Front

What is a molecule?

Back

A molecule is formed when two or more atoms are chemically bonded together.

Tags

NGSS.MS-PS1-1

Front

How do you calculate density?

Back

Density is calculated using the formula: Density = Mass/Volume.

Front

What state of matter has the fastest moving particles?

Back

Gas has the fastest moving particles compared to solids and liquids.

Front

Which group on the periodic table has a full set of valence electrons?

Back

Noble gases have a full set of valence electrons.

Front

What is a coefficient in a chemical equation?

Back

A coefficient is a number placed in front of a chemical formula to indicate how many molecules or moles of that substance are present.

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 the definition of an element?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means.

Front

What is kinetic energy?

Back

Kinetic energy is the energy an object possesses due to its motion.

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-3

NGSS.HS-PS3-2

Front

What are valence electrons?

Back

Valence electrons are the electrons in the outermost shell of an atom that are involved in chemical bonding.