Unit 2- Matter Flashcards
Properties of solids (7)
-higher density
Defined shape and volume
Low KE
Can’t be compressed
Undergoes melting
Vibrational motion
Mutual attraction
Properties of liquids (6)
Undergoes freezing
Undergoes vaporization
Can’t be compressed
Can flow
Defined volume
Mutual attraction
Properties of gas (5)
High KE
Can be compressed
Random motion
Low density
Matter takes both its shape and volume of its container
Do higher or lower dense objects float higher if no mixing
Less dense
Density changes with what
Changes with temperature
Higher temp= ^volume, lower density
What does density show about particles
Shows how compact particles are in a substance
Density is the ratio between…
Mass and volume
Density depends on ___ not ___, aka intrinsic
Depends on substance not size
M=
D=
V=
M=(D)(V)
D=M/V
V=M/D
When 2 atoms are touching what is holding them together
A chemical bond
Elements
1 type of atom/chemical
Cannot be broken down
Keeps chemical identity
Pure
The simpliest form of matter that has a unique set of properties
Compounds
2 or more types of chemically bonded atoms/elements
Chemically broken down
Pure
Mixtures
Combination of two or more
Not chemically combined
Separated by physical means
Not pure
& symbol in code
Homogeneous mixture —solution
Cannot see different parts
Uniform throughout
Solution: things dissolved in liquid, light can pass/shine through
Heterogenous— suspension and colloid
Can see different parts
Is not uniform throughout
Suspension: suspended particles in a liquid that will eventually settle out (Sand and water)
Colloid: suspended particles that don’t settle due to small size (milk)
Centrifuge
Separate by density
Chromatography
Separating components of an ink or dye
Distillation
Separation of two or more liquids based on boiling points
Electrolysis
CHEMICAL SEPARATION H atoms from the oxygen atom in a water molecule
Decantation
Pouring off a liquid from a mixture containing both a liquid and solid
Cystallization
Boiling point, liquid not recovered, only solid remains
T/F: a mixture is not a chemical combining of substances
True
In a compound, the atoms are chemically combined so that the elements that make up the compound…
Loose their identities and do take on new set of properties
What is the smallest identifiable unit of a compound that is made up of atoms which are chemically bonded
Elements
A mixture is always made up of ___
A combination of compounds
T/F in a mixture substances do not retain their identities
False
What is the smallest identifiable unit of an element
An atom
Mass
Amount of matter that an object contains
Physical properties
Characteristics of substance, not how it behaves
Observed w/out changing
No need to chemically alter
Chemical property
Describe chemical composition will change given a specific set of conditions
Observed by changing
Need to chemically alter to determine the properties
Chemical change
Involves a change in the identity/chemical makeup of that substance
All chemical changes are accompanied by physical change
Physical change
No change in identity
All changes of state of matter
