Chemistry chapter 2 test guide

Le system international d’unites (SI)

a international system of measurements

Base Unit

a defined unit in a system of measurement that is based on an object or event.

time

seconds (s)

length

meter (m)

mass

Kilogram (kg)

temperature

kelvin (k)

amount of substance

mole (mol)

electric current

ampere (A)

Luminous intensity

candela (cd)

kilo

(k) 1000 - 10³

centi

( c) 1/100 - 10^-2

milli

(m) 1/1000 - 10^-3

SI base unit of temperature

Kelvin (K)

derived unit

unit that is defined by a combination of base units

density equation

mass/volume

scientific notation

used to express any number between 1 and 9, multiplied by 10 and raised to a power

dimensional analysis

a systematic approach to problem solving that uses conversion factors to move, or convert, from one unit to another

conversion factor

ratio of equivalent value having different units

error

defined as the difference between the experimental value and accepted value

error equation

error = experimental - accepted value

percent error

expresses as a percentage of the accepted value

percent error equation

percent error = error/accepted value x 100

significant figures

all known digits plus one estimated digits

interpolation

reading and estimating values falling between points on the graph

extrapolation

estimating values outside the points by extending the line