Lesson 12, Physical and Chemical Equations Flashcards
https://www.youtube.com/watch?v=6QTLiUk_jwg
What are the two kinds of reactions in chemistry
Physical and Chemical
What is a physical reaction?
A physical reaction does not affect the molecular structure of the item.
The physical features (shape) may change
What are some examples of physical changes?
Melting ice, cutting vegitables, crushing ice, ect.
There are infinite examples
What is evaporation?
Liquid to gas
What is condensation?
Gas to liquid
What is sublimination?
Gas to solid
There is no liquid state
What is a chemical reaction?
A reaction that changes the chemical or atomic makeup of something
What are some signs of chemical reactions
Production of new substances, change in colour, production of gas, light, heat odour
What is an example of a chemical reaction?
Burning paper
Changes chemical compostion, new substace is ash, light is produced
What type of change is boiling ethanol?
Physical
What type of change occurs when perfume evaporates on your skin?
Physical
What type of change is butter melting?
Physical
What type of change is wood rotting?
Chemical
What type of change occurs when autumn leaves change color?
Chemical
What happens to a hot glass when placed in cold water?
Cracks (Physical change)
What type of change is melting copper metal?
Chemical
What type of change occurs when sugar is burned?
Chemical
What type of change is mixing sugar in water?
Physical
What type of change is digesting food?
Chemical
What type of change occurs when you fog a mirror with your breath?
Physical
What type of change is breaking a bone?
Physical
What type of change is mending a broken bone?
Chemical
What type of change occurs when paper is burned?
Chemical
