Physical vs. Chemical Changes Flashcards

Flashcards definitions and examples of physical and chemical changes based on the lecture notes.

Physical change

A change in which the original substance still exists and has only changed in form.

Chemical change

A change in which a new substance is produced, accompanied by energy changes.

Sodium hydroxide dissolving in water

Classified as a physical change.

Hydrochloric acid reacting with potassium hydroxide

Classified as a chemical change that produces a salt, water, and heat.

Slicing a pellet of sodium in two

Classified as a physical change.

Heating water to change it to steam

Classified as a physical change.

Potassium chlorate decomposition

Classified as a chemical change that yields potassium chloride and oxygen gas.

Iron rusting

Classified as a chemical change.

Placing a sodium pellet in water

Classified as a chemical change where it catches on fire, hydrogen gas is liberated, and sodium hydroxide forms.

Evaporation

Classified as a physical change.

Ice melting

Classified as a physical change.

Milk souring

Classified as a chemical change.

Sugar dissolving in water

Classified as a physical change.

Wood rotting

Classified as a chemical change.

Pancakes cooking on a griddle

Classified as a chemical change.

Grass growing in a lawn

Classified as a chemical change.

Inflating a tire with air

Classified as a physical change.

Food digestion in the stomach

Classified as a chemical change.

Water absorption by a paper towel

Classified as a physical change.