A chemical equation is a symbolic representation of a chemical reaction.
Chemical reaction example: Hydrochloric Acid reacts with Sodium Carbonate to produce Carbon Dioxide, Water, and Sodium Chloride.
Reactions in Chemistry - reactants and products
The species to the left of the arrow are called reactants. The species to the right of the arrow are called products.
In symbolic form we write: Na2CO3 + HCl --> CO2 + H2O + NaCl
or by using state symbols : Na2CO3(s) + HCl(aq) --> CO2(g) + H2O(l) + NaCl(aq)
State symbols in chemistry : (s) = solid (l) = liquid (g) = gas (aq) = aqueous (dissolved in water)
Note: Writing chemical reaction in CHEMIX the arrow must be replaced with the > sign.
In CHEMIX writing is stright forward - you do not have to use subscript or superscript.
Example writing a chemical reaction in CHEMIX:
HCl(aq) > CO2(g) + H2O(l) + NaCl(aq)
Balancing: Na2CO3(s) + 2HCl(aq) = CO2(g) + H2O(l) + 2NaCl(aq)
This reaction will produce CO2 gas, H2O will be formed and Sodium and Chlorine will stay in the solution as Na+ and Cl- ions
Note: In CHEMIX (Balance) you can even argument species in the equation by grams (g) or by moles (m).
Example: How many grams of sodium carbonate will produce 10 grams of CO2 gas ?
Solution: Insert 10g (10 grams) in front of CO2 :
Na2CO3(s) + HCl(aq) > 10gCO2(g) + H2O(l) + NaCl(aq)
By downloading CHEMIX more examples will be available.
Related Chemistry topic: Balancing
Equations - Balance Examples
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