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
Chemical Equations
 

A chemical equation is a short hand expression of a chemical reaction. There are two parts to a chemical equation. The reactants are the elements or compounds on the left side of the arrow (-->). The elements and compounds to the right of the arrow are the products.

Identify the reactants and the products in the equation below.

Reactants: 2 H2 + O2
Products: 2H2O

Look at the equation above. Notice the two purple 2s. These numbers are called coefficients. Coefficients are used to balance chemical equations.

The blue arrow is a yield sign. It separates the reactants form the products. Most yield signs will be like the one above, but there are some other yield signs you need to know.

A formula written above a yield sign indicates it is a catalyst used to speed up a reaction.
A triangle above the yield sign indicates the reaction is heated.
Two half arrows pointing in opposite directions indicates that this is a reversible reaction.

The following symbols are written in parenthesis after a formula and represent the state of the element or compound.

s
solid
solid precipitate is produced (used for products only, not reactants)
cr
crystalline (used for solid ionic compounds)
l
liquid
aq
aqueous (substance is dissolved in water)
g
gas
gas is produced (used for products only, not reactants)

Identify the following about the equation below: the reactants, the products, the coefficients used, the state of each element or compound.

Reactants: 2 Na (s) + 2H2O (l)
Products: 2 NaOH (aq) + H2
Coefficients: 2,2,2
State:
Na - solid, H2O - liquid, NaOH - aqueous, H2 - gas


You may also find these related tutorials helpful
copyright© 2000-2024 - Tony Petras - www.sartep.com