Chemical and Physical Changes

Type of change that produces foul milk

Chemical change

The type of change occurring when dissolving sugar in water

Physical change

Please Excuse Coughs Sneezes Burps Or Chunks (Evidence of chemical changes)

Precipitate, Energy change (Heat), Color change, Smell change, Bubbles, Oxidation (Rust) or Combustion - signs a chemical reaction has occurred.

(Chunks)= Combustion

Produces heat or light

Chemical Equation

A shorter, easier way to represent chemical reactions.

(Please)= Precipitate

A solid that is formed when two liquids are combined.

(Burps)= Bubbles form when reactants are combined.

Evidence of a chemical reaction

(Or)= Oxidation; gaining or loosing oxygen producing a new substance

Evidence of a chemical reaction

Chemical Change

New substances with different properties are formed. Signs of a chemical change are precipitates, energy change, color change, smell change, and bubbles.

Physical Change

No new substances are formed. A change in appearance, size, or state (liquid, solid, gas). Ex - water evaporating, cutting paper

(Excuse)= Endothermic reaction

Substance feels cold because heat is released to its surroundings; evidence of a chemical change.

(Excuse)Exothermic reaction

Substance feels warm because heat from surroundings is absorbed.

The type of change occurring when burning wood

Chemical change (Combustion )