Unit 2 Vocabulary 8th Grade Science

A substance made from two or more elements that are chemically bonded together...

• Reactant

• Chemical Reaction

• Compound

• Precipitate

Tags

NGSS.MS-PS1-1

Two or more atoms held together by chemical bonds which act as a single unit. EX: H2O

• Molecule

• Subscript

• Products

• Chemical Formula

Tags

NGSS.MS-PS1-1

A force that holds two or more atoms together by sharing pairs of valence electrons

• Chemical Formula

• Chemical Bond

• Physical Change

• Chemical Change

Tags

NGSS.HS-PS1-1

A 1 or 2 letter Abbreviation of an elements name

• Chemical Formula

• Compound

• Chemical Reaction

• Chemical Symbol

A representation of a substance by use of chemical symbols for all elemental components

• Chemical Change

• Exothermic

• Chemical Formula

• Precipitate

Tags

NGSS.MS-PS1-1

A number in a chemical formula normally printed below the normal line of writing which shows the amount of atoms of an element

• Subscript

• Superscript

• Exponent

• Coefficient

What is the number that is placed before a chemical formula that represents the amount of molecules in a compound?

• Subscript

• Coefficient

• Reactants

• Chemical Symbol

Change in size or shape. No change in Chemical identity

• Chemical Change

• Endothermic

• Precipitate

• Physical Change

What is a Chemical Change?

• A change in chemical identity. Burning, Bubbling, Odor produced, Precipitate formed

• No change in chemical identity. Ice melting, Tearing paper, Breaking Sticks, Breaking glass

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Chemical Reactions are...

• When there is a physical change by breaking something in half

• The chemical representation of a molecule such as H2O

• A process in which atoms of one or more substances rearrange to form new substances

• When there is nothing new formed by chemical means

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5