SI Units
SI base unit for length
What is a meter? (m)
measure of the amount of matter in an object (does not vary with location of object)
What is mass?
measurement of the amount of space occupied by an object
What is volume?
can be observed and measured without changing the identity of the substance
What is a physical property?
these are used to clearly express that the last digit in a measured value contains a degree of uncertainty (it's an estimate)
What are significant figures?
SI base unit for mass
What is a kilogram? (kg)
measure of the gravitational force on an object (varies with location because gravitational force varies)
What is weight?
the formula for calculating density
density = mass divided by volume
d = m/v
can only be determined by observed changes in a substance
What are chemical properties?
the number of significant figures in conversion factors based on definitions or items that are counted
What is infinite? (i.e., they are exact and not limited by significant figures)
SI base unit for time
What is a second? (s)
measures how much the particles of a substance are moving
What is temperature?
unit used to describe the volume of a liquid when calculating density
What is a milliliter? (mL)
observed changes of state (e.g., freezing or melting) are considered this type of change
What are physical changes?
type of digit that is always significant
What is a non-zero digit?
SI base unit for temperature
What is a Kelvin? (K)
based on freezing point of water (0 degrees) and boiling point of water (100 degrees)
What is the Celsius temperature scale?
unit used to describe the volume of a solid when calculating density
What is a cubic centimeter?
cc or cm3
this type of property depends on the amount of matter in the substance (e.g., mass or length)
What is an extensive property?
how close a measurement is to the true or accepted value
What is accuracy?
SI base unit for an amount of matter
What is a mole? (mol)
an absolute scale where 0 degrees means a total absence of heat and no particle movement
What is the Kelvin temperature scale?
Calculate the volume of a gold wire if you have a 100 g piece (the density of gold wire is 10 g/cm3 )
d = m/v therefore v = m/d
v = 100 g divided by 10 g/cm3 = 10 cm3
this type of property does not depend on the amount of matter present in an object (e.g., density or color)
What is an intensive property?
how closely measurements of the same thing are to one another
What is precision?