Unit 1: Properties of Matter Flashcards
What are Properties of Matter?
the nature/characteristics of a substance
Physical Properties
- observed in the absence of any change in the composition
- Atoms/molecules remain same
Examples of Physical Properties
- length
- temperature
- boiling point
- melting point
- color
Chemical Properties
- exhibited by matter as it undergoes changes in composition.
- Atoms/molecules change
- Add, remove, or rearrange atoms
- See effects, but not change – like wind
Examples of Chemical Properties
- burning wood
- rusting iron
- cooking food
Characterize the following as chemical or physical properties:
- a stick is 6 cm long
- a rose is red
- iron can rust
- gasoline is flammable
- a candy bar weighs 52 g
a stick is 6 cm long
Physical
- a rose is red
Physical
- iron can rust
Chemical
- gasoline is flammable
Chemical
- a candy bar weighs 52 g
Physical
What are Intensive Properties?
properties which are independent of the amount of material examined; all chemical properties
Examples of Intensive Properties
- density
- boiling point
- melting point
- specific gravity
What are Extensive Properties?
properties which depend on the amount of material examined
Examples of Extensive Properties
- mass
- length
- volume
Characterize the following as intensive or extensive properties:
- Water has a mass of 250 g
- Soup has a temperature of 40°C
- A gallon of milk is 128 oz
- Aluminum has a density of 2.7 g/cm3
What is a Physical Change
- change in which no change in chemical composition occurs
- Changes appearance of substance
- Substance remains chemically unaltered
Examples of a Physical Change
- melting ice
- freezing water
- boiling water
What is a Chemical Change?
occurs when one of more substances are used up, at least partially, one or more new substances are formed, and energy is absorbed or released
chemical reaction – alter substance by changing atoms
Examples of a Chemical Change?
- combustion of methane
- electrolysis of water
