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 )