Ch. 8 Chemical Equations & Reactions

Chemical Equation

• Represents, with symbols and formulas, the identities and relative amounts of the reactants and products in a chemical reaction. 

• Represents the reactants and products of a chemical reaction by their symbols or formulas.

• A substance combines with oxygen, releasing a large amount of energy in the form of light and heat.

• The ions of two compounds exchange places in an aqueous solution to form two new compounds.

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Coefficient

• A small whole number that appears in front of a formula in a chemical equation.

• A solid that is produced as a result of a chemical reaction in a solution and that separates from the solution.

• The decomposition of a substance by an electric current.

• Also known as displacement reaction, one element replaces a similar element in a compound.

Precipitate

• A substance combines with oxygen, releasing a large amount of energy in the form of light and heat.

• Two or more substances combine to form a new compound.

• A solid that is produced as a result of a chemical reaction in a solution and that separates from the solution.

• The decomposition of a substance by and electric current.

Formula Equation

• A substance combines with oxygen, releasing a large amount of energy in the form of light and heat.

• Represents the reactants and products of a chemical reaction by their symbols or formulas.

• Represents, with symbols and formulas, the identities and relative amounts of the reactants and products in a chemical reaction. 

• Two or more substances combine to form a new compound.

Tags

NGSS.HS-PS1-7

Reversible Reaction

• A reaction that can proceed in both forward and reverse directions.

• A type of reaction that produces only one product.

• Cannot be reversed under any conditions.

• Only occurs in one direction.

Tags

NGSS.HS-PS1-6

Word Equation

• The ions of two compounds exchange places in an aqueous solution to form two new compounds.

• Represents the reactants and products of a chemical reaction by their symbols or formulas.

• One element replaces a similar element in a compound.

• An equation in which reactants and products in a chemical reaction are represented by words.

Combustion Reaction

• A chemical reaction where a substance combines with oxygen to produce heat and light.

• Occurs only in the absence of oxygen.

• Produces only solid residues.

• A physical change that does not involve heat.

Tags

NGSS.HS-PS1-4

Displacement Reaction

• One element replaces a similar element in a compound.

• Two or more substances combine to form a new compound.

• The ions of two compounds exchange places in an aqueous solution to form two new compounds.

• Also known as combustion reaction, two or more substances combine to form a new compound.

Composition Reaction

• Also known as displacement reaction, one element replaces a similar element in a compound.

• A chemical reaction in which the products reform the original reactants.

• One element replaces a similar element in a compound.

• Two or more substances combine to form a new compound.

Tags

NGSS.MS-PS1-5

Decomposition Reaction

• The ions of two compounds exchange places in an aqueous solution to form two new compounds.

• A single compound undergoes a reaction that produces two or more simpler products.

• Also known as combustion reaction, two or more substances combine to form a new compound.

• A substance combines with oxygen, releasing a large amount of energy in the form of light and heat.