chemistry exam Flashcards
(27 cards)
chemical
any substance that has a defined composition.
biochemistry
is the study of the chemical and physical reactions that occur in living things
applied research is required in order to
solve a problem
extensive property of matter
a property that depends on the size of the system (ex. volume, mass)
Intensive property
doesnt depend on the amount in the system (ex. melting point, boiling point)
atom
the smallest unit of an element that maintains the chemical identity of that element.
compound
the substance hat can be broken down into more substances. each compound is made up by 2 or more atoms.
mass
the measure of the quantity on matter
chemical change
creates a whole new substance. cant go back
physical change
doesnt change identity
heterogenous
not uniform though out
mixture
a blend of 2 or more types of matter each remains its own identity
vertical columns
families/groups
rows
periods
metals
conducts eletricity
metaloids
semi conductors
non metals
low conductors
qualitative observations
data descriptive.
Theory
broad generalization that explains a body of facts
standards of measurement
chosen because they have constant value, can easily reproduce
examples of units
length, mass, time, temp, amount of substance, electric current,
SI base for length and time
length; meter
time; second
change in the force of gravity in an object will effect its
weight
measurement of the amount of material
mass
