7.3 Flashcards
Physical property definition
Characteristic of a matieral that you can observe without changing the substance
Examples of physical properties
Color, size, shape density, melting point, viscosity, conductivity, malletability, hardness
Chemicalproperties defnition
Characteristics of a substance that indicates whether it can undergo a certain chemical change
Examples of chem changes
Flammibility, reactivity, combustables, may react to light
Physical change defnition
A change in size shape or state of matter substance. Does not change identity when it undergoes a physical change
Physical change ex
Melting ice
Cutting paper
Breaking glass
Change of state defnition
Changes between chemicals and solids
Chemical change defn
A change in one substance to another substance
Chemical change ex
Fireworks exploding Rusiting metal Banana peel browning Baking a cake Leaf on tree change color Disgestion
Chem change evidence
Color change
Production of a gas
Formation of a precipitate
Is melting point a physical or chemical property
Physical
Does not being able to react mean that something has no properties
No, not being able to react is a chemical property
Law of conservation of mass
1770s antoine lavosier measured mass both before and after chem change
Data showed that no mass was lost or gained during change
The mass of all substanses present before chem change equals mass after chem change
MASS IS NOT CREATED OR DESTROYED
