chemical reactions vocabulary

substance that increases reaction rate by lowering the activation energy of a reaction

• catalyst

• molecule

• endothermic

• synthesis reaction

a reaction in which a single compound breaks down to form two or more simpler substances

• decomposition reaction

• molecule

• double replacement reaction

• catalyst

a change to a substance that happens without forming a new substance

• physical change

• chemical change

• double replacement reaction

• combustion

A number in a chemical formula that tells the number of atoms in a molecule or the ratio of elements in a compound.

• coefficient

• molecule

• subscript

• reciprocal

Type of chemical reaction in which one element replaces another element in a compound. In this type of reaction an element and a compound react and form a different element and a different compound.

• combustion reaction

• double replacement reaction

• single replacement reaction

• sythesis reaction

Tags

NGSS.MS-PS1-2

a reaction in which the negative ions in 2 compounds switch places, forming 2 new compounds. (In this type of reaction two compounds react and form two new compounds.)

• single replacement reaction

• combustion reaction

• synthesis reaction

• double replacement reaction

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

more energy is required to break the bonds of the reactants than is released when the products form, so energy must be absorbed.

• exothermic reaction

• endothermic reaction

• synthesis reaction

• decomposition reaction

Tags

NGSS.HS-PS1-4

more energy is released when the products form than is required to break the bonds in the reactants. The overall reaction releases energy.

• endothermic reaction

• exothermic reaction

• decomposition reaction

• synthesis reaction

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

the minimum amount of energy needed to start a chemical reaction

• catalyst

• enzyme

• activation energy

• inhibitor

a change that alters the identity of a substance resulting in a new substance or substances with different properties.

• physical change

• chemical change

• activation energy

• catalyst

Tags

NGSS.MS-PS1-2