activity series  
  bond energy
 
  bond lengths
 
  calculator

  common names

  conversion factors: energy

  conversion factors: length

  conversion factors: mass

  conversion factors: pressure

  conversion factors: temp.

  conversion factors: volume

  covalent prefixes

  density solver

  diatomic elements

  e-config. chart

  element list

  gas law formulas

  Ka's of polyprotic acids

  Ka's of weak acids

  Kb's of weak bases

  metric conversion chart

  mole conversion chart

  molecular geometries

  organic prefixes

  periodic table

  periodic table (flash)

  pH/pOH converter

  polyatomic ions

  pressure converter

  SI units

  solubility chart

  solubility of salts rules

  solubility product constants

  stoichiometry chart

  temp. conversion

  temp. formulas

  thermodynamic data

  vapor pressure of water
Significant Figures
 

1. All non-zero numbers are significant.
Example: 43.56721 has seven significant figures.
.................21 has 2 significant figures.

................1234.56789 has 9 significant figures.

2. Zeros appearing between non-zero figures are significant.
Example: 80.46 has four significant figures.
................12,007.002 has eight significant figures.

3. Zeros that appear in front of non-zero figures are NOT significant.
Example: 0.006732 has four significant figures.
................0.00000003 has one significant figure.

4. Zeros at the end of a number and to the right of a decimal are significant.
Example: 68.000 has five significant figures.
................12.00000000 has ten significant figures.

5. Zeros at the end of a number but to the left of the decimal may or may not be significant. If a number has a decimal at the end, all numbers are significant. If no decimal is written, the zeros on the end are place holders and should not be considered significant.
Example: 2000 contains one significant figure.
................2000. contains four significant figures.


You may also find these related tutorials helpful
copyright© 2000-2021 - Tony Petras - www.sartep.com