Chem topic 3

• metric system

  international system of units (SI)
• up from base unit

  add zero
• down from base unit

  lose zero
• kilo

  10^3
• hecta

  10^2
• deca

  10^1
• deci

  10^-1
• mili

  10^-3
• micro

  10^-6
• when doing multi step converisons

  convert to base first
• nano

  10^-9
• centi

  10^-2
• density

  ratio of mass to volume
• cm^3

  volume
• what is the equation for calculating kelvin

  k = c +273
• what is the equation for calculating celcius

  c = 5/9 (f-32)
• what does a positive number indicate in scientific notation

  decimal moves to the right
• what does a negative number indicate in scientific notation

  decimal moves to the left
• leading zeros are

  insignificant
• all non zero integers are

  significant
• trailing zeros are only significant if there is a

  decimal present
• captive zeros are always

  significant