molecule
smallest particle of pure substance that is capable of a stable independent existence
atoms
particles that make up molecules
matter
anything that has mass or takes up space
mass
measurement of the amount of matter in an object.
Object in Earth has same mass as on the moon.
weight
a measurement of the gravitational force acting on an object
physical properties of matter
can be observed without changing the composition
chemical properties of matter
can be observed only by attempting to change the matter into new substances
compounds
pure substances that are made up of 2 or more heteroatomic molecules or individual atoms.
elements
pure substances made up of homoatomic molecules or individual atoms of the same kind
Difference between law and theory
a law describes what nature does under certain conditions and will predict what will happen as long as those conditions are met. A theory explains how nature works.
kinetic energy
energy in motion
potential energy
energy an object has due to its position
multiplying scientific notation: (a x 10y)(b x 10z)=
=(a x b)(10y+z)
scientific notation division: (a x 10 y )
(b x 10z) =
(a/b) (10y-z)
scientific notation addition:
adding and subtracting exponential expressions MUST have like terms
significant figures
leading 0s are never significant figures
exact numbers
numbers that have no uncertainty
1 m/x cm
1 m/100 cm
precision
how close a series of measurements are to one another
accuracy
how close the measure value is to the actual value