Unit 2: Chemical Formulas and Equations Vocabulary

Front

What is the term for one or two letters used to represent an element?

Back

Symbol(s)

Front

What is a change in which the substance(s) are transformed into one or more new substances with different properties?

Back

Chemical change

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

What do you call the substances that are present before a chemical reaction occurs?

Back

Reactants

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

What are the numbers in a chemical equation that indicate the number of molecules or atoms called?

Back

Coefficients

Front

What are the substances formed as a result of a chemical reaction called?

Back

Products

Tags

NGSS.MS-PS1-5

Front

What is the law that states that mass is neither created nor destroyed in a chemical reaction?

Back

Law of Conservation of Mass

Tags

NGSS.MS-PS1-5

Front

What is the term for a chemical formula that shows the actual number of atoms of each element in a molecule?

Back

Molecular formula

Front

What is the term for a chemical formula that shows the simplest whole-number ratio of atoms in a compound?

Back

Empirical formula

Front

What is the process called when a chemical reaction occurs in which energy is absorbed?

Back

Endothermic reaction

Tags

NGSS.MS-PS3-4

Front

What is the process called when a chemical reaction occurs in which energy is released?

Back

Exothermic reaction

Tags

NGSS.HS-PS1-4