Chemical Reactions

Front

What is a physical change?

Back

A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition. Examples include melting, freezing, and dissolving.

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances. It involves the breaking and forming of bonds between atoms. Examples include burning, rusting, and digestion.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

What is a chemical property?

Back

A chemical property is a characteristic of a substance that can only be observed during a chemical reaction. Examples include reactivity with acids, flammability, and oxidation states.

Front

What is a physical property?

Back

A physical property is a characteristic of a substance that can be observed or measured without changing the identity of the substance. Examples include color, density, and state of matter.

Tags

NGSS.MS-PS1-4

Front

What is a double displacement reaction?

Back

A double displacement reaction is a type of chemical reaction where two compounds exchange ions or bonds to form two new compounds. Example: AB + CD → AD + CB.

Front

What is a synthesis reaction?

Back

A synthesis reaction is a type of chemical reaction where two or more simple substances combine to form a more complex substance. Example: A + B → AB.

Tags

NGSS.MS-PS1-5

Front

What is a decomposition reaction?

Back

A decomposition reaction is a type of chemical reaction where a single compound breaks down into two or more simpler products. Example: AB → A + B.

Tags

NGSS.MS-PS1-5

Front

What is a single displacement reaction?

Back

A single displacement reaction is a type of chemical reaction where one element replaces another in a compound. Example: A + BC → AC + B.

Tags

NGSS.MS-PS1-5

Front

What is activation energy?

Back

Activation energy is the minimum amount of energy required to initiate a chemical reaction. It is the energy needed to break bonds in the reactants.

Front

What is combustion?

Back

Combustion is a chemical reaction that occurs when a substance reacts rapidly with oxygen, releasing energy in the form of light and heat. Example: burning of wood or gasoline.

Tags

NGSS.MS-PS1-5