activity series  
  bond energy
  bond lengths


  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

Calories and Joules

In chemistry we measure heat using two different units: calories and joules. A calorie is defined as the amount of energy needed to raise the temperature of one gram of water one degree Celsius. The “calorie” you are most familiar with is used to measure the energy content of food. This “calorie” is actually a kilocalorie (1000 calories) and is written with a capital C to distinguish it from the calorie used in chemistry.
The Calories listed for this candy bar are actually kilocalories.
The other unit used to measure heat is the joule. The joule is the SI (System International) unit. In this juice label from Amsterdam you can see that energy (“energie”) is given in kilojoules and kilocalories.
To convert between calories and joules:
1 Calorie (kcal) = 1000 calories (cal) = 4184 joules (J) = 4.184 kilojoules (kJ)
or use this chart:

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